Summary: CHCH domain

Pfam includes annotations and additional family information from a range of different sources. These sources can be accessed via the tabs below.

Wikipedia: Cytochrome c oxidase
Wikipedia: NADH dehydrogenase (ubiquinone)
Pfam
InterPro

This is the Wikipedia entry entitled "Cytochrome c oxidase". More...

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Cytochrome c oxidase Edit Wikipedia article

The enzyme cytochrome c oxidase is a large transmembrane protein found in the mitochondrion and is the terminal electron acceptor in the electron transfer chain, taking four reducing equivalents from cytochrome c and converting molecular oxygen to water. In the process, it translocates protons, helping to establish a chemiosmotic potential that ATP synthase then uses to synthesize ATP.

Summary reaction:

4 Fe⁺²-cyochrome c + 4H⁺ + O₂ â†’ 4 Fe⁺³-cytochrome c + H₂0.

The complex is a large lipoprotein comprised of a number of metal prosthetic sites and 13 protein subunits, which in mammals, 10 are nuclear in origin and 3 are synthesized mitochondrially. The complex contains 2 cytochromes, the a and a₃ cytochromes, and two copper centers, the Cu_A and Cu_B centers. In fact, the cytochrome a₃ and Cu_B are a binuclear center and this is the site of oxygen reduction. The mechanism of action of this large complex is still an active research topic.

Further information

The Cytochrome Oxidase home page

This page is based on a Wikipedia article. The text is available under the Creative Commons Attribution/Share-Alike License.

This is the Wikipedia entry entitled "NADH dehydrogenase (ubiquinone)". More...

The Wikipedia text that you see displayed here is a download from Wikipedia. This means that the information we display is a copy of the information from the Wikipedia database. The button next to the article title ("Edit Wikipedia article") takes you to the edit page for the article directly within Wikipedia. You should be aware you are not editing our local copy of this information. Any changes that you make to the Wikipedia article will not be displayed here until we next download the article from Wikipedia. We currently download new content on a nightly basis.

Does Pfam agree with the content of the Wikipedia entry ?

Pfam has chosen to link families to Wikipedia articles. In some case we have created or edited these articles but in many other cases we have not made any direct contribution to the content of the article. The Wikipedia community does monitor edits to try to ensure that (a) the quality of article annotation increases, and (b) vandalism is very quickly dealt with. However, we would like to emphasise that Pfam does not curate the Wikipedia entries and we cannot guarantee the accuracy of the information on the Wikipedia page.

Editing Wikipedia articles

Before you edit for the first time

Wikipedia is a free, online encyclopedia. Although anyone can edit or contribute to an article, Wikipedia has some strong editing guidelines and policies, which promote the Wikipedia standard of style and etiquette. Your edits and contributions are more likely to be accepted (and remain) if they are in accordance with this policy.

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Anyone can edit a Wikipedia entry. You can do this either as a new user or you can register with Wikipedia and log on. When you click on the "Edit Wikipedia article" button, your browser will direct you to the edit page for this entry in Wikipedia. If you are a registered user and currently logged in, your changes will be recorded under your Wikipedia user name. However, if you are not a registered user or are not logged on, your changes will be logged under your computer's IP address. This has two main implications. Firstly, as a registered Wikipedia user your edits are more likely seen as valuable contribution (although all edits are open to community scrutiny regardless). Secondly, if you edit under an IP address you may be sharing this IP address with other users. If your IP address has previously been blocked (due to being flagged as a source of 'vandalism') your edits will also be blocked. You can find more information on this and creating a user account at Wikipedia.

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NADH dehydrogenase (ubiquinone) Edit Wikipedia article

Redirect to:

NADH:ubiquinone reductase

From a page move: This is a redirect from a page that has been moved (renamed) or is the result of a page move. One reason this page was kept as a redirect is to avoid breaking links, both internal and external, that may have been made to the old page name. Any redirect with a page move logged on its history page should be tagged with this rcat template.

This page is based on a Wikipedia article. The text is available under the Creative Commons Attribution/Share-Alike License.

This tab holds the annotation information that is stored in the Pfam database. As we move to using Wikipedia as our main source of annotation, the contents of this tab will be gradually replaced by the Wikipedia tab.

CHCH domain Provide feedback

we have identified a conserved motif in the LOC118487 protein that we have called the CHCH motif. Alignment of this protein with related members showed the presence of three subgroups of proteins, which are called the S (Small), N (N-terminal extended) and C (C-terminal extended) subgroups. All three sub-groups of proteins have in common that they contain a predicted conserved [coiled coil 1]-[helix 1]-[coiled coil 2]-[helix 2] domain (CHCH domain). Within each helix of the CHCH domain, there are two cysteines present in a C-X9-C motif. The N-group contains an additional double helix domain, and each helix contains the C-X9-C motif. This family contains a number of characterised proteins: Cox19 protein - a nuclear gene of Saccharomyces cerevisiae, codes for an 11-kDa protein (Cox19p) required for expression of cytochrome oxidase. Because cox19 mutants are able to synthesise the mitochondrial and nuclear gene products of cytochrome oxidase, Cox19p probably functions post-translationally during assembly of the enzyme. Cox19p is present in the cytoplasm and mitochondria, where it exists as a soluble intermembrane protein. This dual location is similar to what was previously reported for Cox17p, a low molecular weight copper protein thought to be required for maturation of the CuA centre of subunit 2 of cytochrome oxidase. Cox19p have four conserved potential metal ligands, these are three cysteines and one histidine. Mrp10 - belongs to the class of yeast mitochondrial ribosomal proteins that are essential for translation [2]. Eukaryotic NADH-ubiquinone oxidoreductase 19 kDa (NDUFA8) subunit [3]. The CHCH domain was previously called DUF657 [4].

Literature references

Nobrega MP, Bandeira SC, Beers J, Tzagoloff A; , J Biol Chem 2002;277:40206-40211.: Characterization of COX19, a widely distributed gene required for expression of mitochondrial cytochrome oxidase. PUBMED:12171940 EPMC:12171940
Jin C, Myers AM, Tzagoloff A; , Curr Genet 1997;31:228-234.: Cloning and characterization of MRP10, a yeast gene coding for a mitochondrial ribosomal protein. PUBMED:9065385 EPMC:9065385
Triepels R, van den Heuvel L, Loeffen J, Smeets R, Trijbels F, Smeitink J; , Hum Genet 1998;103:557-563.: The nuclear-encoded human NADH:ubiquinone oxidoreductase NDUFA8 subunit: cDNA cloning, chromosomal localization, tissue distribution, and mutation detection in complex-I-deficient patients. PUBMED:9860297 EPMC:9860297
Westerman BA, Poutsma A, Steegers EA, Oudejans CB; , Genomics 2004;83:1094-1104.: C2360, a nuclear protein expressed in human proliferative cytotrophoblasts, is a representative member of a novel protein family with a conserved coiled coil-helix-coiled coil-helix domain. PUBMED:15177562 EPMC:15177562

Internal database links

SCOOP:	Cmc1 COX17 COX6B CX9C DUF1690 DUF2076 DUF885 GCK MTCP1 NDUF_B7 Pet191_N
Similarity to PfamA using HHSearch:	MTCP1 CX9C

This tab holds annotation information from the InterPro database.

InterPro entry IPR010625

A conserved motif was identified in the LOC118487 protein was called the CHCH motif. Alignment of this protein with related members showed the presence of three subgroups of proteins, which are called the S (Small), N (N-terminal extended) and C (C-terminal extended) subgroups. All three sub-groups of proteins have in common that they contain a predicted conserved [coiled coil 1]-[helix 1]-[coiled coil 2]-[helix 2] domain (CHCH domain). Within each helix of the CHCH domain, there are two cysteines present in a C-X9-C motif. The N-group contains an additional double helix domain, and each helix contains the C-X9-C motif. This family contains a number of characterised proteins: Cox19 protein - a nuclear gene of Saccharomyces cerevisiae, codes for an 11kDa protein (Cox19p) required for expression of cytochrome oxidase. Because cox19 mutants are able to synthesise the mitochondrial and nuclear gene products of cytochrome oxidase, Cox19p probably functions post-translationally during assembly of the enzyme. Cox19p is present in the cytoplasm and mitochondria, where it exists as a soluble intermembrane protein. This dual location is similar to what was previously reported for Cox17p, a low molecular weight copper protein thought to be required for maturation of the CuA centre of subunit 2 of cytochrome oxidase. Cox19p have four conserved potential metal ligands, these are three cysteines and one histidine. Mrp10 - belongs to the class of yeast mitochondrial ribosomal proteins that are essential for translation [ PUBMED:9065385 ]. Eukaryotic NADH-ubiquinone oxidoreductase 19kDa (NDUFA8) subunit [ PUBMED:9860297 ]. The CHCH domain was previously called DUF657 [ PUBMED:15177562 ].

Domain organisation

Below is a listing of the unique domain organisations or architectures in which this domain is found. More...

Loading domain graphics...

Pfam Clan

This family is a member of clan CHCH (CL0351), which has the following description:

The conserved [coiled coil 1]-[helix 1]-[coiled coil 2]-[helix 2] domain (CHCH domain) superfamily members include NADH-ubiquinone oxidoreductases, some cytochrome oxidases and yeast mitochondrial ribosomal proteins. Within each helix of the CHCH domain there are two cysteines present in a C-X9-C motif.

The clan contains the following 8 members:

CHCH Cmc1 COX17 COX6B CX9C MTCP1 NDUF_B7 Ndufs5

Alignments

We store a range of different sequence alignments for families. As well as the seed alignment from which the family is built, we provide the full alignment, generated by searching the sequence database (reference proteomes) using the family HMM. We also generate alignments using four representative proteomes (RP) sets and the UniProtKB sequence database. More...

There are various ways to view or download the sequence alignments that we store. We provide several sequence viewers and a plain-text Stockholm-format file for download.

Alignment types

We make a range of alignments for each Pfam-A family:

seed: the curated alignment from which the HMM for the family is built
full: the alignment generated by searching the sequence database using the HMM
RP15/RP35/RP55/RP75: Representative Proteomes (RPs) at 15%, 35%, 55% and 75% co-membership thresholds
UniProt: alignment generated by searching the UniProtKB sequence database using the family HMM

Viewing

You can see the alignments as HTML or in three different sequence viewers:

jalview: a Java applet developed at the University of Dundee. You will need Java installed before running jalview
HTML: an HTML page showing the whole alignment.Please note: full Pfam alignments can be very large. These HTML views are extremely large and often cause problems for browsers. Please use either jalview or the Pfam viewer if you have trouble viewing the HTML version
PP/Heatmap: an HTML-based representation of the alignment, coloured according to the posterior-probability (PP) values from the HMM. As for the standard HTML view, heatmap alignments can also be very large and slow to render.

Reformatting

You can download (or view in your browser) a text representation of a Pfam alignment in various formats:

Selex
Stockholm
FASTA
MSF

You can also change the order in which sequences are listed in the alignment, change how insertions are represented, alter the characters that are used to represent gaps in sequences and, finally, choose whether to download the alignment or to view it in your browser directly.

Downloading

You may find that large alignments cause problems for the viewers and the reformatting tool, so we also provide all alignments in Stockholm format. You can download either the plain text alignment, or a gzipped version of it.

View options

We make a range of alignments for each Pfam-A family. You can see a description of each above. You can view these alignments in various ways but please note that some types of alignment are never generated while others may not be available for all families, most commonly because the alignments are too large to handle.

	Seed (48)	Full (4168)	Representative proteomes				UniProt (6872)
	Seed (48)	Full (4168)	RP15 (660)	RP35 (1751)	RP55 (3156)	RP75 (4301)	UniProt (6872)
Jalview	View	View	View	View	View	View	View
HTML	View	View
PP/heatmap	₁	View

¹Cannot generate PP/Heatmap alignments for seeds; no PP data available

Key: available, not generated, — not available.

Format an alignment

	Seed (48)	Full (4168)	Representative proteomes				UniProt (6872)
	Seed (48)	Full (4168)	RP15 (660)	RP35 (1751)	RP55 (3156)	RP75 (4301)	UniProt (6872)
Alignment:
Format:
Order:	Tree Alphabetical
Sequence:	Inserts lower case All upper case
Gaps:
Download/view:	Download View

Download options

We make all of our alignments available in Stockholm format. You can download them here as raw, plain text files or as gzip-compressed files.

	Seed (48)	Full (4168)	Representative proteomes				UniProt (6872)
	Seed (48)	Full (4168)	RP15 (660)	RP35 (1751)	RP55 (3156)	RP75 (4301)	UniProt (6872)
Raw Stockholm	Download	Download	Download	Download	Download	Download	Download
Gzipped	Download	Download	Download	Download	Download	Download	Download

You can also download a FASTA format file containing the full-length sequences for all sequences in the full alignment.

HMM logo

HMM logos is one way of visualising profile HMMs. Logos provide a quick overview of the properties of an HMM in a graphical form. You can see a more detailed description of HMM logos and find out how you can interpret them here. More...

Trees

This page displays the phylogenetic tree for this family's seed alignment. We use FastTree to calculate neighbour join trees with a local bootstrap based on 100 resamples (shown next to the tree nodes). FastTree calculates approximately-maximum-likelihood phylogenetic trees from our seed alignment.

Note: You can also download the data file for the tree.

Curation and family details

This section shows the detailed information about the Pfam family. You can see the definitions of many of the terms in this section in the glossary and a fuller explanation of the scoring system that we use in the scores section of the help pages.

Curation

Seed source:

Westerman BA, Poutsma A, Steegers E, Oudejans CBM

Previous IDs:

none

Type:

Domain

Sequence Ontology:

SO:0000417

Author:

Westerman BA

, Poutsma A, Steegers E

, Oudejans CBM

, Bateman A

Number in seed:

48

Number in full:

4168

Average length of the domain:

35.5 aa

Average identity of full alignment:

27 %

Average coverage of the sequence by the domain:

22.92 %

HMM information

HMM build commands:

build method: hmmbuild -o /dev/null HMM SEED

search method: hmmsearch -Z 61295632 -E 1000 --cpu 4 HMM pfamseq

Model details:

Parameter	Sequence	Domain
Gathering cut-off	27.2	27.2
Trusted cut-off	27.2	27.2
Noise cut-off	27.1	27.1

Model length:

35

Family (HMM) version:

16

Download:

download the raw HMM for this family

Species distribution

Sunburst
Tree

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number of sequences
number of species

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Colour assignments

Archea	Eukaryota
Bacteria	Other sequences
Viruses	Unclassified
Viroids	Unclassified sequence

Selections

Align selected sequences to HMM

Generate a FASTA-format file

Clear selection

This visualisation provides a simple graphical representation of the distribution of this family across species. You can find the original interactive tree in the adjacent tab. More...

This chart is a modified "sunburst" visualisation of the species tree for this family. It shows each node in the tree as a separate arc, arranged radially with the superkingdoms at the centre and the species arrayed around the outermost ring.

How the sunburst is generated

The tree is built by considering the taxonomic lineage of each sequence that has a match to this family. For each node in the resulting tree, we draw an arc in the sunburst. The radius of the arc, its distance from the root node at the centre of the sunburst, shows the taxonomic level ("superkingdom", "kingdom", etc). The length of the arc represents either the number of sequences represented at a given level, or the number of species that are found beneath the node in the tree. The weighting scheme can be changed using the sunburst controls.

In order to reduce the complexity of the representation, we reduce the number of taxonomic levels that we show. We consider only the following eight major taxonomic levels:

superkingdom
kingdom
phylum
class
order
family
genus
species

Colouring and labels

Segments of the tree are coloured approximately according to their superkingdom. For example, archeal branches are coloured with shades of orange, eukaryotes in shades of purple, etc. The colour assignments are shown under the sunburst controls. Where space allows, the name of the taxonomic level will be written on the arc itself.

As you move your mouse across the sunburst, the current node will be highlighted. In the top section of the controls panel we show a summary of the lineage of the currently highlighed node. If you pause over an arc, a tooltip will be shown, giving the name of the taxonomic level in the title and a summary of the number of sequences and species below that node in the tree.

Anomalies in the taxonomy tree

There are some situations that the sunburst tree cannot easily handle and for which we have work-arounds in place.

Missing taxonomic levels

Some species in the taxonomic tree may not have one or more of the main eight levels that we display. For example, Bos taurus is not assigned an order in the NCBI taxonomic tree. In such cases we mark the omitted level with, for example, "No order", in both the tooltip and the lineage summary.

Unmapped species names

The tree is built by looking at each sequence in the full alignment for the family. We take the name of the species given by UniProt and try to map that to the full taxonomic tree from NCBI. In some cases, the name chosen by UniProt does not map to any node in the NCBI tree, perhaps because the chosen name is listed as a synonym or a misspelling in the NCBI taxonomy.

So that these nodes are not simply omitted from the sunburst tree, we group them together in a separate branch (or segment of the sunburst tree). Since we cannot determine the lineage for these unmapped species, we show all levels between the superkingdom and the species as "uncategorised".

Sub-species

Since we reduce the species tree to only the eight main taxonomic levels, sequences that are mapped to the sub-species level in the tree would not normally be shown. Rather than leave out these species, we map them instead to their parent species. So, for example, for sequences belonging to one of the Vibrio cholerae sub-species in the NCBI taxonomy, we show them instead as belonging to the species Vibrio cholerae.

Too many species/sequences

For large species trees, you may see blank regions in the outer layers of the sunburst. These occur when there are large numbers of arcs to be drawn in a small space. If an arc is less than approximately one pixel wide, it will not be drawn and the space will be left blank. You may still be able to get some information about the species in that region by moving your mouse across the area, but since each arc will be very small, it will be difficult to accurately locate a particular species.

Loading sunburst data...

Tree controls

Hide

The tree shows the occurrence of this domain across different species. More...

Species trees

We show the species tree in one of two ways. For smaller trees we try to show an interactive representation, which allows you to select specific nodes in the tree and view them as an alignment or as a set of Pfam domain graphics.

Unfortunately we have found that there are problems viewing the interactive tree when the it becomes larger than a certain limit. Furthermore, we have found that Internet Explorer can become unresponsive when viewing some trees, regardless of their size. We therefore show a text representation of the species tree when the size is above a certain limit or if you are using Internet Explorer to view the site.

If you are using IE you can still load the interactive tree by clicking the "Generate interactive tree" button, but please be aware of the potential problems that the interactive species tree can cause.

Interactive tree

For all of the domain matches in a full alignment, we count the number that are found on all sequences in the alignment. This total is shown in the purple box.

We also count the number of unique sequences on which each domain is found, which is shown in green. Note that a domain may appear multiple times on the same sequence, leading to the difference between these two numbers.

Finally, we group sequences from the same organism according to the NCBI code that is assigned by UniProt, allowing us to count the number of distinct sequences on which the domain is found. This value is shown in the pink boxes.

We use the NCBI species tree to group organisms according to their taxonomy and this forms the structure of the displayed tree. Note that in some cases the trees are too large (have too many nodes) to allow us to build an interactive tree, but in most cases you can still view the tree in a plain text, non-interactive representation. Those species which are represented in the seed alignment for this domain are highlighted.

You can use the tree controls to manipulate how the interactive tree is displayed:

show/hide the summary boxes
highlight species that are represented in the seed alignment
expand/collapse the tree or expand it to a given depth
select a sub-tree or a set of species within the tree and view them graphically or as an alignment
save a plain text representation of the tree

Loading...

Please note: for large trees this can take some time. While the tree is loading, you can safely switch away from this tab but if you browse away from the family page entirely, the tree will not be loaded.

Structures

For those sequences which have a structure in the Protein DataBank, we use the mapping between UniProt, PDB and Pfam coordinate systems from the PDBe group, to allow us to map Pfam domains onto UniProt sequences and three-dimensional protein structures. The table below shows the structures on which the CHCH domain has been found. There are 104 instances of this domain found in the PDB. Note that there may be multiple copies of the domain in a single PDB structure, since many structures contain multiple copies of the same protein sequence.

Loading structure mapping...

AlphaFold Structure Predictions

The list of proteins below match this family and have AlphaFold predicted structures. Click on the protein accession to view the predicted structure.

Protein	Predicted structure	External Information
A0A044SEY3	View 3D Structure	Click here
A0A077YYW2	View 3D Structure	Click here
A0A077ZET7	View 3D Structure	Click here
A0A0D2EZG8	View 3D Structure	Click here
A0A0D2GPN2	View 3D Structure	Click here
A0A0D2GRH7	View 3D Structure	Click here
A0A0H5S3R8	View 3D Structure	Click here
A0A0H5SD56	View 3D Structure	Click here
A0A0K0E975	View 3D Structure	Click here
A0A0K0EJ67	View 3D Structure	Click here
A0A0K0J1N8	View 3D Structure	Click here
A0A175VNZ7	View 3D Structure	Click here
A0A175WGZ3	View 3D Structure	Click here
A0A1C1CHJ2	View 3D Structure	Click here
A0A1C1CVF4	View 3D Structure	Click here
A0A1D6HBV3	View 3D Structure	Click here
A0A1D6JZK8	View 3D Structure	Click here
A0A1D6KGL4	View 3D Structure	Click here
A0A1D6KZK4	View 3D Structure	Click here
A0A1D6MC83	View 3D Structure	Click here
A0A1D6PCQ3	View 3D Structure	Click here
A0A1D8PJ94	View 3D Structure	Click here
A0A2K6VU89	View 3D Structure	Click here
A0A2K6W155	View 3D Structure	Click here
A0A2K6WJQ8	View 3D Structure	Click here
A4HYD7	View 3D Structure	Click here
A8E4L1	View 3D Structure	Click here
A8MQS6	View 3D Structure	Click here
A8QHI9	View 3D Structure	Click here
B2RUM3	View 3D Structure	Click here
B5DER5	View 3D Structure	Click here
B6SJ12	View 3D Structure	Click here
B6SM12	View 3D Structure	Click here
B7ZVA6	View 3D Structure	Click here
C0ND30	View 3D Structure	Click here
C0NK91	View 3D Structure	Click here
C1GNU3	View 3D Structure	Click here
C6SWP3	View 3D Structure	Click here
C6SX80	View 3D Structure	Click here
C6T0M8	View 3D Structure	Click here

Showing 40 matches

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Family: CHCH (PF06747)

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Summary: CHCH domain

Does Pfam agree with the content of the Wikipedia entry ?

Editing Wikipedia articles

Before you edit for the first time

How your contribution will be recorded

Contact us

Cytochrome c oxidase Edit Wikipedia article

Does Pfam agree with the content of the Wikipedia entry ?

Editing Wikipedia articles

Before you edit for the first time

How your contribution will be recorded

Contact us

NADH dehydrogenase (ubiquinone) Edit Wikipedia article

CHCH domain Provide feedback

Literature references

Internal database links

InterPro entry IPR010625

Domain organisation

Pfam Clan

Alignments

Alignment types

Viewing

Reformatting

Downloading

View options

Format an alignment

Download options

HMM logo

Trees

Curation and family details

Curation

HMM information

Species distribution

Sunburst controls

Weight segments by...

Change the size of the sunburst

Colour assignments

Selections

Currently selected:

How the sunburst is generated

Colouring and labels

Anomalies in the taxonomy tree

Missing taxonomic levels

Unmapped species names

Sub-species

Too many species/sequences

Tree controls

Annotation

Download tree

Selected sequences

Species trees

Interactive tree

Structures

AlphaFold Structure Predictions

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