期刊
BIOCHEMICAL JOURNAL
卷 392, 期 -, 页码 485-491出版社
PORTLAND PRESS LTD
DOI: 10.1042/BJ20051038
关键词
avidin-biotin technology; circular permutation; dual-chain avidin; protein engineering; single-chain avidin; subunit fusion
scAvd (single-chain avidin, where two dcAvd are joined in a single polypeptide chain), having four biotin-binding domains, was constructed by fusion of topologically modified avidin units. scAvd showed similar biotin binding and thermal stability properties as chicken avidin. The DP4A construct encoding scAvd contains four circularly permuted avidin domains, plus short linkers connecting the four domains into a single polypeptide chain. In contrast with wild-type avidin, which contains four identical avidin monomers, scAvd enables each one of the four avidin domains to be independently modified by protein engineering. Therefore the scAvd scaffold car, be used to construct spatially and stoichiometrically defined pseudotetrameric avidin molecules showing different domain characteristics. In addition, unmodified scAvd could be used as a fusion partner, since it provides a unique non-oligomeric structure, which is fully functional with four high-affinity biotin-binding sites. Furthermore, the subunit-to-domain strategy described in the present study could be applied to other proteins and protein complexes, facilitating the development of sophisticated protein tools for applications in nanotechnology and life sciences.
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