Mechanisms of immediate temperature compensation: experiments with brain synaptosomes from rat and ground squirrel.

Abstract:

:Glucose conversion by brain synaptosomes can be regarded as a special case of intrinsic kinetic properties of the enzyme substrate system. Temperature modulation of apparent K(m) for this process can be described with our kinetic model. Using experimental data and the kinetic model, the minimal K(m) value for glucose conversion in ground squirrel synaptosomes was found at the lower temperature (6.5 degrees C), much lower than that for the rat (16.6 degrees C). The inversion temperatures (T(min)) closely coincided with the lowest body temperatures from which the unassisted recovery from hypothermia was demonstrated in both species. This study indicated that thermal modulation of enzyme affinities may have an adaptive role in endotherms that is linked to their tolerance to hypothermia.

journal_name

Ann N Y Acad Sci

authors

Marjanović M,Zivadinović D,Dzakula Z,Andjus RK

doi

10.1196/annals.1342.005

subject

Has Abstract

pub_date

2005-06-01 00:00:00

pages

47-59

eissn

0077-8923

issn

1749-6632

pii

1048/1/47

journal_volume

1048

pub_type

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