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Complement C3 plays a pivotal role in both classical and alternate pathways. Lower organisms (urochordates and fishes) have multiple isoforms whereas higher organisms have a single C3 gene. In cobras, a closely related protein cobra venom factor (CVF) is expressed in their venom gland. We have recently shown that Austrelaps superbus contains two isoforms (AVF-1 and AVF-2) of CVF-like proteins in the...
Cobra venom factor (CVF) is characteristic of the elapid cobras and has not been reported from venoms of any other families of snakes. During our search for novel proteins, we isolated a polypeptide from the venom of the snake Austrelaps superbus (Lowland Copperhead) that showed structural similarity to C-terminal segment of the α-chain of CVF and hence named as AVFαc (AVF—A. superbus venom factor)...
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