Hydrophobic interaction between the monomer of mitochondrial malate dehydrogenase and phospholipid membranes.

K. A. Webster; K. B. Freeman; S. Ohki

doi:10.1042/bj1860227

Hydrophobic interaction between the monomer of mitochondrial malate dehydrogenase and phospholipid membranes.

K. A. Webster, K. B. Freeman, S. Ohki

Molecular and Cellular Pharmacology

Research output: Contribution to journal › Article

4 Scopus citations

Abstract

Porcine mitochondrial malate dehydrogenase (EC 1.1.1.37) dissociates into subunits on dilution. The enzyme monomer caused large increases in the surface pressure of monolayers of 1:1 phosphatidylserine/phosphatidylcholine at air/water and oil/water interfaces. The monomer increased the permeability of phospholipid vesicles to 22Na+. Both effects were significantly greater than the corresponding effects of ribonuclease A, cytochrome c and the dimeric form of malate dehydrogenase. Changes in the circular-dichroism spectra of the enzyme indicated that conformational changes may be associated with dimer formation or when monomer interacts with lysophosphatidyl-choline. Similar interactions to those described may occur in situ when mitochondrial malate dehydrogenase is transported to the mitochondrial matrix from its site of synthesis on cytosolic ribosomes.

Original language	English (US)
Pages (from-to)	227-233
Number of pages	7
Journal	The Biochemical journal
Volume	186
Issue number	1
DOIs	https://doi.org/10.1042/bj1860227
State	Published - Jan 15 1980

ASJC Scopus subject areas

Biochemistry
Molecular Biology
Cell Biology

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Webster, K. A., Freeman, K. B., & Ohki, S. (1980). Hydrophobic interaction between the monomer of mitochondrial malate dehydrogenase and phospholipid membranes. The Biochemical journal, 186(1), 227-233. https://doi.org/10.1042/bj1860227

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abstract = "Porcine mitochondrial malate dehydrogenase (EC 1.1.1.37) dissociates into subunits on dilution. The enzyme monomer caused large increases in the surface pressure of monolayers of 1:1 phosphatidylserine/phosphatidylcholine at air/water and oil/water interfaces. The monomer increased the permeability of phospholipid vesicles to 22Na+. Both effects were significantly greater than the corresponding effects of ribonuclease A, cytochrome c and the dimeric form of malate dehydrogenase. Changes in the circular-dichroism spectra of the enzyme indicated that conformational changes may be associated with dimer formation or when monomer interacts with lysophosphatidyl-choline. Similar interactions to those described may occur in situ when mitochondrial malate dehydrogenase is transported to the mitochondrial matrix from its site of synthesis on cytosolic ribosomes.",

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