Use of riboflavin-binding protein to investigate steric and electronic relationships in flavin analogs and models

A. Wessiak, L. M. Schopfer, L. C. Yuan

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5 Citations (Scopus)

Abstract

We have examined the affinity of two recently synthesized flavin analogs for the isoalloxazine binding site of riboflavin-binding protein (RBP). The results showed that pyrimidopterines could bind to RBP [K(d) 160-250 μM]. This suggested that, at the FMN or FAD level, these analogs might also bind to other apoflavoproteins, thereby providing a high potential probe for flavin enzymology. In contrast, 4a,5-ring-opened isoalloxazines did not bind to RBP. However, 1,10a-ring-opened flavins bind with considerably avidity [K(d) about 40 nM]. Evidence is presented which indicates that the 4a,5-ring-opened species adopted a nonplanar configuration which, in turn, was responsible for the lack of affinity to RBP. Steric and electronic consequences of a 4a,5 ring opening are discussed in relation to flavin-dependent phenolic hydroxylases.

Original languageEnglish (US)
Pages (from-to)4246-4249
Number of pages4
JournalProceedings of the National Academy of Sciences of the United States of America
Volume81
Issue number14 I
DOIs
StatePublished - Jan 1 1984

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Flavins
Flavin Mononucleotide
Flavin-Adenine Dinucleotide
Mixed Function Oxygenases
Binding Sites
riboflavin-binding protein
4,6-dinitro-o-cresol
isoalloxazine
protein K

ASJC Scopus subject areas

  • General

Cite this

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abstract = "We have examined the affinity of two recently synthesized flavin analogs for the isoalloxazine binding site of riboflavin-binding protein (RBP). The results showed that pyrimidopterines could bind to RBP [K(d) 160-250 μM]. This suggested that, at the FMN or FAD level, these analogs might also bind to other apoflavoproteins, thereby providing a high potential probe for flavin enzymology. In contrast, 4a,5-ring-opened isoalloxazines did not bind to RBP. However, 1,10a-ring-opened flavins bind with considerably avidity [K(d) about 40 nM]. Evidence is presented which indicates that the 4a,5-ring-opened species adopted a nonplanar configuration which, in turn, was responsible for the lack of affinity to RBP. Steric and electronic consequences of a 4a,5 ring opening are discussed in relation to flavin-dependent phenolic hydroxylases.",
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AU - Wessiak, A.

AU - Schopfer, L. M.

AU - Yuan, L. C.

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N2 - We have examined the affinity of two recently synthesized flavin analogs for the isoalloxazine binding site of riboflavin-binding protein (RBP). The results showed that pyrimidopterines could bind to RBP [K(d) 160-250 μM]. This suggested that, at the FMN or FAD level, these analogs might also bind to other apoflavoproteins, thereby providing a high potential probe for flavin enzymology. In contrast, 4a,5-ring-opened isoalloxazines did not bind to RBP. However, 1,10a-ring-opened flavins bind with considerably avidity [K(d) about 40 nM]. Evidence is presented which indicates that the 4a,5-ring-opened species adopted a nonplanar configuration which, in turn, was responsible for the lack of affinity to RBP. Steric and electronic consequences of a 4a,5 ring opening are discussed in relation to flavin-dependent phenolic hydroxylases.

AB - We have examined the affinity of two recently synthesized flavin analogs for the isoalloxazine binding site of riboflavin-binding protein (RBP). The results showed that pyrimidopterines could bind to RBP [K(d) 160-250 μM]. This suggested that, at the FMN or FAD level, these analogs might also bind to other apoflavoproteins, thereby providing a high potential probe for flavin enzymology. In contrast, 4a,5-ring-opened isoalloxazines did not bind to RBP. However, 1,10a-ring-opened flavins bind with considerably avidity [K(d) about 40 nM]. Evidence is presented which indicates that the 4a,5-ring-opened species adopted a nonplanar configuration which, in turn, was responsible for the lack of affinity to RBP. Steric and electronic consequences of a 4a,5 ring opening are discussed in relation to flavin-dependent phenolic hydroxylases.

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