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The preAR2 region (1458–1492) in factor V‐Short is crucial for the synergistic TFPIα‐cofactor activity with protein S and the assembly of a trimolecular factor Xa‐inhibitory complex comprising FV‐Short, protein S, and TFPIα

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Factor V‐Short (FV756‐1458) is a natural splice variant in which 702 residues are deleted from the B domain. It exposes an acid region (AR2; 1493–1537) that binds tissue factor pathway… Click to show full abstract

Factor V‐Short (FV756‐1458) is a natural splice variant in which 702 residues are deleted from the B domain. It exposes an acid region (AR2; 1493–1537) that binds tissue factor pathway inhibitor alpha (TFPIα). Protein S also interacts with TFPIα and serves as TFPIα‐cofactor in factor Xa (FXa) inhibition. FV‐Short and protein S function as synergistic TFPIα‐cofactors in inhibition of FXa. FV810‐1492 is an artificial FV‐Short variant that cannot synergize with protein S as TFPIα cofactor even though it contains AR2 and binds TFPIα.

Keywords: factor short; protein; tfpi cofactor; factor

Journal Title: Journal of Thrombosis and Haemostasis
Year Published: 2021

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