Summary: Lon protease (S16) C-terminal proteolytic domain

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Wikipedia: Lon protease family
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This is the Wikipedia entry entitled "Lon protease family". More...

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Lon protease family Edit Wikipedia article

ATP-dependent protease La (LON) domain

crystal structure of n-terminal domain of e.coli lon protease

Identifiers

Symbol

LON

Pfam clan

1zbo / SCOPe / SUPFAM

Available protein structures:
Pfam Â	structures / ECOD Â
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

Lon protease (S16) C-terminal proteolytic domain

Identifiers

Symbol

LON

Pfam clan

1rr9 / SCOPe / SUPFAM

Available protein structures:
Pfam Â	structures / ECOD Â
PDB	RCSB PDB; PDBe; PDBj
PDBsum	structure summary

In molecular biology, the Lon protease family is a family of proteases. They are found in archaea, bacteria and eukaryotes. Lon proteases are ATP-dependent serine peptidases belonging to the MEROPS peptidase family S16 (lon protease family, clan SF). In the eukaryotes the majority of the Lon proteases are located in the mitochondrial matrix.^[1]^[2] In yeast, the Lon protease PIM1 is located in the mitochondrial matrix. It is required for mitochondrial function, it is constitutively expressed but is increased after thermal stress, suggesting that PIM1 may play a role in the heat shock response.^[3]

References

^ Wang N, Gottesman S, Willingham MC, Gottesman MM, Maurizi MR (1993). "A human mitochondrial ATP-dependent protease that is highly homologous to bacterial Lon protease". Proc. Natl. Acad. Sci. U.S.A. 90 (23): 11247â€“51. PMCÂ 47959. PMIDÂ 8248235. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
^ Barakat S, Pearce DA, Sherman F, Rapp WD (1998). "Maize contains a Lon protease gene that can partially complement a yeast pim1-deletion mutant". Plant Mol. Biol. 37 (1): 141â€“54. PMIDÂ 9620272. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)
^ Van Dyck L, Pearce DA, Sherman F (1994). "PIM1 encodes a mitochondrial ATP-dependent protease that is required for mitochondrial function in the yeast Saccharomyces cerevisiae". J. Biol. Chem. 269 (1): 238â€“42. PMIDÂ 8276800. {{cite journal}}: Unknown parameter |month= ignored (help)CS1 maint: multiple names: authors list (link)

External links

MEROPS family S16

This article incorporates text from the public domain Pfam and InterPro: IPR003111

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.

Lon protease (S16) C-terminal proteolytic domain Provide feedback

The Lon serine proteases must hydrolyse ATP to degrade protein substrates. In Escherichia coli, these proteases are involved in turnover of intracellular proteins, including abnormal proteins following heat-shock. The active site for protease activity resides in a C-terminal domain. The Lon proteases are classified as family S16 in Merops.

Literature references

Vasilyeva OV, Kolygo KB, Leonova YF, Potapenko NA, Ovchinnikova TV; , FEBS Lett 2002;526:66-70.: Domain structure and ATP-induced conformational changes in Escherichia coli protease Lon revealed by limited proteolysis and autolysis. PUBMED:12208506 EPMC:12208506

Internal database links

SCOOP:	ChlI PDZ PDZ_2 PDZ_6 Peptidase_M50
Similarity to PfamA using HHSearch:	ChlI

External database links

MEROPS:	S16
SCOP:	1rr9

This tab holds annotation information from the InterPro database.

InterPro entry IPR008269

Lon (also known as endopeptidase La) is a multi-domain ATP- dependent protease found throughout all kingdoms of life. It is involved in protein quality control and several regulatory processes. All Lon proteases contain an ATPase domain belonging to the AAA+ superfamily of molecular machines, and a proteolytic domain with a serine-lysine catalytic dyad in which a lysine assists the catalytic serine in proteolytic cleavage. Lon proteases can be divided into two subfamilies: A type (A-Lons), which have a large multi-lobed N-terminal domain together with the ATPase and protease domains, and B type (B-Lons), which lack an N domain, but have a membrane-anchoring region emerging from the ATPase domain. B-Lons are found in Archaea, in which they are the lone membrane-anchored ATP-dependent protease. The soluble A-Lons are found in all bacteria and in eukaryotic cell organelles, such as mitochondria and peroxisomes, and are needed for recovery from various stress conditions [ PUBMED:14665623 , PUBMED:15456757 , PUBMED:16002085 , PUBMED:20834233 , PUBMED:20222013 , PUBMED:24520911 ]. The Lon proteolytic domain forms peptidase family S16 of clan SJ [ PUBMED:16002085 ].

The structure of the Lon proteolytic domain consists of six alpha helices and ten beta strands [ PUBMED:14665623 , PUBMED:15456757 , PUBMED:16002085 , PUBMED:20834233 , PUBMED:20222013 ].

Gene Ontology

The mapping between Pfam and Gene Ontology is provided by InterPro. If you use this data please cite InterPro.

Molecular function	serine-type endopeptidase activity (GO:0004252)
Molecular function	ATP-dependent peptidase activity (GO:0004176)
Biological process	proteolysis (GO:0006508)

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 S5 (CL0329), which has the following description:

This superfamily contains a wide range of families that possess a structure similar to the second domain of ribosomal S5 protein.

The clan contains the following 18 members:

ChlI DNA_gyraseB DNA_mis_repair EFG_IV Fae GalKase_gal_bdg GHMP_kinases_N IGPD Lon_C LpxC Morc6_S5 Ribonuclease_P Ribosomal_S5_C Ribosomal_S9 RNase_PH Topo-VIb_trans UPF0029 Xol-1_N

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
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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 (23)	Full (17660)	Representative proteomes				UniProt (79301)
	Seed (23)	Full (17660)	RP15 (2917)	RP35 (8949)	RP55 (17547)	RP75 (28489)	UniProt (79301)
Jalview	View	View	View	View	View	View	View
HTML	View
PP/heatmap	₁

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

Key: available, not generated, — not available.

Format an alignment

	Seed (23)	Full (17660)	Representative proteomes				UniProt (79301)
	Seed (23)	Full (17660)	RP15 (2917)	RP35 (8949)	RP55 (17547)	RP75 (28489)	UniProt (79301)
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 (23)	Full (17660)	Representative proteomes				UniProt (79301)
	Seed (23)	Full (17660)	RP15 (2917)	RP35 (8949)	RP55 (17547)	RP75 (28489)	UniProt (79301)
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:

Merops

Previous IDs:

none

Type:

Domain

Sequence Ontology:

SO:0000417

Author:

Studholme DJ

Number in seed:

23

Number in full:

17660

Average length of the domain:

179.4 aa

Average identity of full alignment:

33 %

Average coverage of the sequence by the domain:

25.31 %

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	21.1	21.1
Trusted cut-off	21.1	21.1
Noise cut-off	21.0	21.0

Model length:

205

Family (HMM) version:

16

Download:

download the raw HMM for this family

Species distribution

Sunburst
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Colour assignments

Archea	Eukaryota
Bacteria	Other sequences
Viruses	Unclassified
Viroids	Unclassified sequence

Selections

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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.

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Tree controls

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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

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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 Lon_C domain has been found. There are 212 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
A0A077ZGW8	View 3D Structure	Click here
A0A077ZIH0	View 3D Structure	Click here
A0A077ZMC3	View 3D Structure	Click here
A0A077ZMG7	View 3D Structure	Click here
A0A0D2GQM6	View 3D Structure	Click here
A0A0D2GZD3	View 3D Structure	Click here
A0A0H3GJ60	View 3D Structure	Click here
A0A0H3GR39	View 3D Structure	Click here
A0A0K0EES4	View 3D Structure	Click here
A0A0K0IZJ4	View 3D Structure	Click here
A0A0N4U770	View 3D Structure	Click here
A0A0R4IH79	View 3D Structure	Click here
A0A175W1N7	View 3D Structure	Click here
A0A175W2U6	View 3D Structure	Click here
A0A1C1C9V4	View 3D Structure	Click here
A0A1C1CR16	View 3D Structure	Click here
A0A1D6ETU0	View 3D Structure	Click here
A0A1D6F4Q7	View 3D Structure	Click here
A0A1D6IP30	View 3D Structure	Click here
A0A1D6K094	View 3D Structure	Click here
A0A1D6NGE9	View 3D Structure	Click here
A0A2K6VQS2	View 3D Structure	Click here
A0A3P7ECT6	View 3D Structure	Click here
A0A3Q0KL23	View 3D Structure	Click here
A0A486WX02	View 3D Structure	Click here
A0A5K4ELM8	View 3D Structure	Click here
A0A5S9MRR3	View 3D Structure	Click here
A0L516	View 3D Structure	Click here
A0LEE9	View 3D Structure	Click here
A0LG61	View 3D Structure	Click here
A2QCJ2	View 3D Structure	Click here
A2RAF6	View 3D Structure	Click here
A2YQ56	View 3D Structure	Click here
A3LUF7	View 3D Structure	Click here
A3M072	View 3D Structure	Click here
A4J7L6	View 3D Structure	Click here
A4S6Y4	View 3D Structure	Click here
A5EWF3	View 3D Structure	Click here
A5IYF2	View 3D Structure	Click here
A6LD45	View 3D Structure	Click here

Showing 40 matches

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Family: Lon_C (PF05362)

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