The catalytic subunit of pseutarin C, a group C prothrombin activator from the venom of Pseudonaja textilis, is structurally similar to mammalian blood coagulation factor Xa

Thrombosis and Haemostasis
Veena S RaoR Manjunatha Kini

Abstract

Pseutarin C, a group C prothrombin activator from Pseudonaja textilis venom, is a large protein complex consisting of catalytic and nonenzymatic subunits, which are functionally similar to the mammalian FXa-FVa complex. Here, we present the complete cDNA sequence of the catalytic subunit of pseutarin C. The cDNA of the catalytic subunit encodes a protein of 449 amino acids, which includes a 22-residue signal peptide, 18-residue propeptide and a mature protein of 409 amino acids. The deduced amino acid sequence shows 74-83% identity to group D prothrombin activators from snake venom and approximately 42% identity to mammalian FX and has identical domain structure. The precursor of the catalytic subunit of pseutarin C has several unique features. The activation peptide of the catalytic subunit of pseutarin C is significantly smaller (27 as compared to 52 residues in mammalian FX) and does not contain any glycosylation sites. Unlike coagulation FXa, Ser52 and Asn45 of the light and heavy chains are O- and N-glycosylated in pseutarin C catalytic sub-unit. There is a 12-residue insertion in pseutarin C catalytic sub-unit close to the region that is implicated in binding to FVa. This is the first sequence of the catalytic subunit of ...Continue Reading

Citations

Jun 3, 2005·Molecular Biology and Evolution·Liam St PierreMartin F Lavin
Apr 8, 2011·The FEBS Journal·Tse Siang KangR Manjunatha Kini
May 19, 2006·Pathophysiology of Haemostasis and Thrombosis·R Manjunatha Kini
Aug 17, 2005·Journal of Thrombosis and Haemostasis : JTH·Q LuK J Clemetson
Jun 25, 2021·Arteriosclerosis, Thrombosis, and Vascular Biology·Mark SchreuderMettine H A Bos
Jun 1, 2005·Toxicon : Official Journal of the International Society on Toxinology·R Manjunatha Kini
Jun 19, 2007·Experimental and Molecular Pathology·Roscoe L WarnerFelix de la Iglesia
Sep 15, 2009·Experimental and Molecular Pathology·Roscoe L WarnerFelix A de la Iglesia

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