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Role of accelerated segment switch in exons to alter ...

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Role of accelerated segment switch in exons to alter targeting (ASSET) in the molecular evolution of snake venom proteins

Name:Personal
Doley, Robin Role :Text(marcrelator)
creator

Name:Personal
Mackessy, Stephen P. Role :Text(marcrelator)
creator

Name:Personal
Kini, R. Manjunatha Role :Text(marcrelator)
creator

typeOfResource
text genre
Origin Information Place :Text
United Kingdom
BioMed Central
(keyDate="yes")
2009

dateCaptured

Language:Text
English

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born digital
14 pages


abstract
BACKGROUND: Snake venom toxins evolve more rapidly than other proteins through accelerated changes in the protein coding regions. Previously we have shown that accelerated segment switch in exons to alter targeting (ASSET) might play an important role in its functional evolution of viperid three-finger toxins. In this phenomenon, short sequences in exons are radically changed to unrelated sequences and hence affect the folding and functional properties of the toxins. RESULTS: Here we analyzed other snake venom protein families to elucidate the role of ASSET in their functional evolution. ASSET appears to be involved in the functional evolution of three-finger toxins to a greater extent than in several other venom protein families. ASSET leads to replacement of some of the critical amino acid residues that affect the biological function in three-finger toxins as well as change the conformation of the loop that is involved in binding to specific target sites. CONCLUSION: ASSET could lead to novel functions in snake venom proteins. Among snake venom serine proteases, ASSET contributes to changes in three surface segments. One of these segments near the substrate binding region is known to affect substrate specificity, and its exchange may have significant implications for differences in isoform catalytic activity on specific target protein substrates. ASSET therefore plays an important role in functional diversification of snake venom proteins, in addition to accelerated point mutations in the protein coding regions. Accelerated point mutations lead to fine-tuning of target specificity, whereas ASSET leads to large-scale replacement of multiple functionally important residues, resulting in change or gain of functions. note
Published in: BMC Evolutionary Biology, 9:146
Subject
Elapid venoms

Subject
Elapidae

Subject
Molecular evolution

Subject
Exons

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1471-2148
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http://hdl.handle.net/10176/cogru:164

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eng

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