Summary: MSP (Major sperm protein) domain
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Major sperm protein Edit Wikipedia article
The Major Sperm Protein, commonly abbrieviated to MSP, is the most abundant protein in nematode sperm, making up about 15% of the total protein in the sperm cell. It is responsible for the cell's motility.
The MSP molecules are part of the cell cytoskeleton. They are built up into a set of long chains organised into bundles at the front of the cell, and are disassembled at the back. This pushes the cell forward in a process called treadmilling.
Although there are similar amino acid sequences in other organisms, MCP appears to be unique to the sperm of nematodes.
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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.
MSP (Major sperm protein) domain Provide feedback
Major sperm proteins are involved in sperm motility. These proteins oligomerise to form filaments. This family contains many other proteins.
Bullock TL, Roberts TM, Stewart M; , J Mol Biol 1996;263:284-296.: 2.5 A resolution crystal structure of the motile major sperm protein (MSP) of Ascaris suum. PUBMED:8913307 EPMC:8913307
King KL, Stewart M, Roberts TM, Seavy M; , J Cell Sci 1992;101:847-857.: Structure and macromolecular assembly of two isoforms of the major sperm protein (MSP) from the amoeboid sperm of the nematode, Ascaris suum. PUBMED:1527183 EPMC:1527183
Internal database links
|SCOOP:||ASH BACON_2 TMEM131_like_N|
External database links
This tab holds annotation information from the InterPro database.
InterPro entry IPR000535
Nematode sperm are unusual amoeboid cells in which motility is not based on actin, but instead on the major sperm protein (MSP). MSP is a dimeric molecule that polymerises to form non-polar filaments constructed from two helical subfilaments that wind round one another. The filaments then assemble into larger macromolecular assemblies called fibre complexes. MSP is a small (~14kDa) basic protein typically encoded by a multigene family of up to 28 members [ PUBMED:8913307 , PUBMED:12051923 , PUBMED:9878374 , PUBMED:9641981 ]. An about 120-amino acid domain similar to MSP has been found in other proteins, including:
- Animal Vesicle-Associated Membrane Protein-associated (VAMP-associated) protein family of 33kDa (VAP33). VAP33 is required for neurotransmitter release. It binds to the v-SNARE synaptobrevin/VAMP which is associated with vesicle fusion. VAP33 has a two-domain structure with its N terminus being highly homologous to MSP, whereas its C terminus is based on a putative alpha-helical coiled-coil combined with an extremely hydrophobic membrane-attachment region [ PUBMED:9920726 ].
- Nicotiana plumbaginifolia VAP27, a VAP33 homologue. It interacts with the resistance protein Cf9 [ PUBMED:10733941 ].
- Yeast inositol regulator SCS2, a VAP33 homologue. It is C-terminally anchored to the endoplasmic reticulum [ PUBMED:9537365 ].
The MSP polypeptide chain has an immunoglobulin-like fold based on a seven-stranded beta sandwich measuring approximately 15 A x 20 A x 45 A and having opposing three-stranded and four-stranded beta sheets [ PUBMED:8913307 ].
This entry represents the MSP domain.
Below is a listing of the unique domain organisations or architectures in which this domain is found. More...
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This family is a member of clan PapD-like (CL0556), which has the following description:
This superfamily is characterised by proteins in families involved in ciliary or flagellar function. The families may be acting as chaperones.
The clan contains the following 8 members:ASH DUF1573 EcpB_C Motile_Sperm PapD-like PapD_N Peptidase_M60_C TMEM131_like_N
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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.
1Cannot generate PP/Heatmap alignments for seeds; no PP data available
Key: available, not generated, — not available.
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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.
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|Author:||Bateman A , Griffiths-Jones SR|
|Number in seed:||50|
|Number in full:||9387|
|Average length of the domain:||103.2 aa|
|Average identity of full alignment:||24 %|
|Average coverage of the sequence by the domain:||33.05 %|
|HMM build commands:||
build method: hmmbuild -o /dev/null HMM SEED
search method: hmmsearch -Z 61295632 -E 1000 --cpu 4 HMM pfamseq
|Family (HMM) version:||29|
|Download:||download the raw HMM for this family|
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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:
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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.
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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.
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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.
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The tree shows the occurrence of this domain across different species. More...
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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.
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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 Motile_Sperm domain has been found. There are 50 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.
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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.