Human mitochondrial aldehyde dehydrogenase substrate specificity: comparison of esterase with dehydrogenase reaction.

Abstract:

:Substrate specificity of human mitochondrial low Km aldehyde dehydrogenase (EC 1.2.1.3) E2 isozyme has been investigated employing p-nitrophenyl esters of acyl groups of two to six carbon atoms and comparing with that of aldehydes of one to eight carbon atoms. The esterase reaction was studied under three conditions: in the absence of coenzyme, in the presence of NAD (1 mM), and in the presence of NADH (160 microM). The maximal velocity of the esterase reaction with p-nitrophenyl acetate and propionate as substrates in the presence of NAD was 3.9-4.7 times faster than that of the dehydrogenase reaction. Under all other conditions the velocities of dehydrogenase and esterase reactions were similar; the lowest kcat was for p-nitrophenyl butyrate in the presence of NAD. Stimulation of esterase activity by coenzymes was confined to esters of short acyl chain length; with longer acyl chain lengths or increased bulkiness (p-nitrophenyl guanidinobenzoate) no effect or even inhibition was observed. Comparison of kinetic constants for esters demonstrates that p-nitrophenyl butyrate is the worst substrate of all esters tested, suggesting that the active site topography is uniquely unfavorable for p-nitrophenyl butyrate. This fact is, however, not reflected in kinetic constants for butyraldehyde, which is a good substrate. The substrate specificity profile as determined by comparison of kcat/Km ratios was found to be quite different for aldehydes and esters. For aldehydes kcat/Km ratios increased with the increase of chain length; with esters under all three conditions, a V-shaped curve was produced with a minimum at p-nitrophenyl butyrate.

journal_name

Arch Biochem Biophys

authors

Mukerjee N,Pietruszko R

doi

10.1016/0003-9861(92)90239-s

subject

Has Abstract

pub_date

1992-11-15 00:00:00

pages

23-9

issue

1

eissn

0003-9861

issn

1096-0384

pii

0003-9861(92)90239-S

journal_volume

299

pub_type

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