Letunic et al. (2017) Nucleic Acids Res doi: 10.1093/nar/gkx922
Letunic et al. (2020) Nucleic Acids Res doi: 10.1093/nar/gkaa937

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PSA Paramecium Surface Antigen Repeat

SMART accession number:	SM00639
Description:	-
Interpro abstract (IPR002895):	The G surface protein of Paramecium primaurelia has important internal homologies and a periodic structure, which could be dictated in part by the rigid scaffolding of cysteine residues. The predicted secondary structure shows a quasi absence of alpha-helix and an abundance of beta-pleated sheets and random coils. The monotony of the amino acid sequence is in favour of a structural role for the protein [ (PUBMED:3783679) ]. This structure is based on the presence of 37 periods of about 75 residues, each period containing eight cysteine residues [ (PUBMED:2308165) ]. Homologies with other proteins are limited to surface antigens of trypanosomes.
Family alignment:	View or CHROMA formatHMM/Web logoCLUSTALW formatMSF formatFASTA formatPIR format

There are 2198 PSA domains in 139 proteins in SMART's nrdb database.

Click on the following links for more information.

• Evolution (species in which this domain is found)

• Taxonomic distribution of proteins containing PSA domain.

  This tree includes only several representative species. The complete taxonomic breakdown of all proteins with PSA domain is also avaliable.

  Click on the protein counts, or double click on taxonomic names to display all proteins containing PSA domain in the selected taxonomic class.

• Links (links to other resources describing this domain)

• PFAM	Paramecium_SA
  INTERPRO	IPR002895

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