Schultz et al. (1998) Proc. Natl. Acad. Sci. USA 95, 5857-5864
Letunic et al. (2012) Nucleic Acids Res , doi:10.1093/nar/gkr931

• HOME
• SETUP
• FAQ
• ABOUT
• GLOSSARY
• WHAT'S NEW
• FEEDBACK

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 formatCLUSTALW 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)

• Click on to expand nodes. To display all proteins with a PSA domain in a specific node, click on it.

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

  Useful shortcuts: Expand all nodes or Collapse tree
  

• Links (links to other resources describing this domain)

• PFAM	Paramecium_SA
  INTERPRO	IPR002895

Send comments to Ivica Letunic