Paramecium surface antigen (IPR002895)

Short name: Paramecium_SA


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 [PMID: 3783679]. This structure is based on the presence of 37 periods of about 75 residues, each period containing eight cysteine residues [PMID: 2308165]. Homologies with other proteins are limited to surface antigens of trypanosomes.

Contributing signatures

Signatures from InterPro member databases are used to construct an entry.