Increased stability and catalytic efficiency of yeast hexokinase upon interaction with zwitterionic micelles. Kinetics and conformational studies.

Abstract:

:The effect of ligands (glucose, ATP and Mg2+) and zwitterionic micelles of lysophosphatidylcholine (LPC) or N-hexadecyl-N,N-dimethyl-3-ammonium propanesulfonate (HPS) in the yeast hexokinase (HK) stability was studied at 35 degrees C. The thermal inactivation kinetics followed one-exponential decay. The effect of ligands on protecting the enzyme against inactivation followed the order: glucose > glucose/Mg2+ >ATP/Mg2+ approximately or approximately equal to Mg2+l approximately or approximately equal to buffer only. Both LPC and HPS micelles increased the enzyme stability only when the incubation medium contained glucose or glucose/Mg2+, suggesting that the protein conformation is a key prerequisite for the enzyme-micelle interaction to take place. This enzyme-micelle interaction resulted in an increased catalytic efficiency (with a decrease in Km for ATP and increase in Vmax as well as in changes on the tertiary (intrinsic fluorescence) structure of the yeast hexokinase.

journal_name

Biosci Rep

journal_title

Bioscience reports

authors

Guerra R,Bianconi ML

doi

10.1023/a:1005583117296

keywords:

subject

Has Abstract

pub_date

2000-02-01 00:00:00

pages

41-9

issue

1

eissn

0144-8463

issn

1573-4935

journal_volume

20

pub_type

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