Enzymatic and thermodynamic profiles of a heterotetramer lactate dehydrogenase isozyme in swine.

Abstract:

:Lactate dehydrogenase (LDH) is a glycolytic enzyme that catalyzes the final step of glycolysis and produces NAD+. In somatic cells, LDH forms homotetramers and heterotetramers that are encoded by two different genes: LDHA (skeletal muscle type, M) and LDHB (heart type, H). Analysis of LDH isozymes is important for understanding the physiological role of homotetramers and heterotetramers and for optimizing inhibition of their enzymatic activity as it may result in distinct effects. Previously, we reported that hydroxychloroquine (HCQ) inhibited LDH activity, but we did not examine isozyme specificity. In the present study, we isolated heterotetrameric LDH (H2M2) from swine brain, determined its kinetic and thermodynamic properties, and examined the effect of HCQ on its activity compared to homotetrameric LDH isozymes. We show that: (1) the Km values for H2M2-mediated catalysis of pyruvate or lactate were intermediate compared to those for the homotetrameric isozymes, M4 and H4 whereas the Vmax values were similar; (2) the Km and Vmax values for H2M2-mediated catalysis of NADH were not significantly different among LDH isozymes; (3) the values for activation energy and van't Hoff enthalpy changes for pyruvate reduction of H2M2 were intermediate compared to those for the homotetrameric isozymes; (4) the temperature for half residual activity of H2M2 was closer to that for M4 than for H4. We also show that HCQ had different affinities for various LDH isozymes.

authors

Goto T,Sugawara K,Nakamura S,Kidokoro SI,Wakui H,Nunomura W

doi

10.1016/j.bbrc.2016.09.118

subject

Has Abstract

pub_date

2016-10-28 00:00:00

pages

860-867

issue

4

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(16)31585-6

journal_volume

479

pub_type

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