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- W3158911086 abstract "The semi-fossil and pit-less Azemiops feae is possibly the most primitive crotalid species. Here, we have cloned and sequenced cDNAs encoding four serine proteases (vSPs) from the venom glands of Chinese A. feae . Full amino-acid sequences of the major vSP (designated as AzKNa) and three minor vSPs (designated as AzKNb, AzKNc and Az-PA) were deduced. Using Protein-BLAST search, the ten most-similar vSPs for each Azemiops vSP have been selected for multiple sequence alignment, and all the homologs are crotalid vSPs. The results suggest that the A. feae vSPs are structurally most like those of eastern-Chinese Gloydius , Viridovipera , Protobothrops and North American pitvipers, and quite different from more-specialized vSPs such as Agkistrodon venom Protein-C activators. The vSPs from Chinese A. feae and those from Vietnamese A. feae show significant sequence variations. AzKNa is acidic and contains six potential N -glycosylation sites and its surface-charge distribution differs greatly from that of AzKNb, as revealed by 3D-modeling. AzKNb and AzKNc do not contain N -glycosylation sites although most of their close homologs contain one or two. Az-PA belongs to the plasminogen-activator subtype with a conserved N 20 -glycosylation site. The evolution of this subtype of vSPs in Azemiops and related pitvipers has been traced by phylogenetic analysis. • Full sequences of 4 novel venom serine proteases of Chinese Azemiops feae are solved, two of them are glycoproteins. • Azemiops proteases are closest in sequence similarity to those of Gloydius , Viridovipera , Protobothrops and New World pitvipers. • Phylogeny tree of venom plasminogen activators confirms close relationships of Azemiops with Gloydius and Crotalus. • Venom toxins of Azemiops from eastern China and Vietnam reveal geographic variations." @default.
- W3158911086 created "2021-05-10" @default.
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- W3158911086 date "2021-07-01" @default.
- W3158911086 modified "2023-09-26" @default.
- W3158911086 title "Structural and bioinformatic analyses of Azemiops venom serine proteases reveal close phylogeographic relationships to pitvipers from eastern China and the New World" @default.
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- W3158911086 doi "https://doi.org/10.1016/j.toxicon.2021.04.022" @default.
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