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Biotin and biotin analogues specifically modify the fluorescence decay of avidin.

Abstract：

:Avidin, a basic tetrameric glycoprotein, isolated from hen egg-white, binds up to four molecules of biotin with exceptionally high affinity. The presence of tryptophanyl residues in the active site pointed out the opportunity of correlating the protein fluorescence with biotin binding. We have performed both steady state and dynamic fluorescence experiments using biotin or biotin-derived molecules (biotinamine, diaminobiotin and iminobiotin) as ligands. The fluorescence decay data can only be fitted by two continuous distributions of lifetimes which may reflect the presence of static or dynamic microheterogeneity in the environment of the tryptophan residues. We observed that the binding of biotin, biotinamine and iminobiotin reduces the widths of both distributions to discrete lifetimes thus indicating a more homogenous environment for the emitting tryptophan residues. Instead, the binding of diaminobiotin, which lacks the imidazolone ring, affects one lifetime distribution only. The binding of biotin also affects the rotational correlation time of avidin, which becomes shorter, suggesting a more compact structure of the ligated protein. The utility of analyzing the fluorescence in terms of distributions appears to be further warranted.

journal_name

J Mol Biol

journal_title

Journal of molecular biology

authors

Mei G,Pugliese L,Rosato N,Toma L,Bolognesi M,Finazzi-Agrò A

doi

10.1006/jmbi.1994.1600

subject

Has Abstract

pub_date

1994-09-30 00:00:00

pages

559-65

issue

4

eissn

0022-2836

issn

1089-8638

pii

S0022-2836(84)71600-7

journal_volume

242

pub_type

杂志文章

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