当前位置： SCI文献检索 > BIOCHEMISTRY期刊下所有文献 > Transient formation of a neutral ubisemiquinone radical and subsequent intramolecular electron transfer to pyrroloquinoline quinone in the Escherichia coli membrane-integrated glucose dehydrogenase.

Transient formation of a neutral ubisemiquinone radical and subsequent intramolecular electron transfer to pyrroloquinoline quinone in the Escherichia coli membrane-integrated glucose dehydrogenase.

Abstract：

:The membrane-bound quinoprotein glucose dehydrogenase (mGDH) in Escherichia coli contains pyrroloquinoline quinone (PQQ) and participates in the direct oxidation of D-glucose to D-gluconate by transferring electrons to ubiquinone (UQ). To elucidate the mechanism of ubiquinone reduction by mGDH, we applied a pulse radiolysis technique to mGDH with or without bound UQ8. With the UQ8-bound enzyme, a hydrated electron reacted with mGDH to form a transient species with an absorption maximum at 420 nm, characteristic of formation of a neutral ubisemiquinone radical. Subsequently, the decay of the absorbance at 420 nm was accompanied by an increase in the absorbance at 370 nm. Experiments with the PQQ-free apoenzyme showed no such subsequent absorption changes, although ubisemiquinone was formed. These results indicate that a pathway for an intramolecular electron transfer from ubisemiquinone radical at the UQ8 binding site to PQQ exists in mGDH. The first-order rate constant of this process was calculated to be equal to 1.2 x 10(3) s(-1). These findings are consistent with our proposal that during the catalytic cycle of mGDH the bound UQ8 mediates electron transfer from the reduced PQQ to UQ8 pools.

journal_name

Biochemistry

journal_title

Biochemistry

authors

Kobayashi K,Mustafa G,Tagawa S,Yamada M

doi

10.1021/bi051347n

subject

Has Abstract

pub_date

2005-10-18 00:00:00

pages

13567-72

issue

41

eissn

0006-2960

issn

1520-4995

journal_volume

44

pub_type

杂志文章

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