PMID: 9003445Jan 4, 1997Paper

Purification and characterization of D(+)-carnitine dehydrogenase from Agrobacterium sp.--a new enzyme of carnitine metabolism

Biochimica Et Biophysica Acta
H Hanschmann, H P Kleber

Abstract

D(+)-Carnitine dehydrogenase from Agrobacterium sp. catalyzes the oxidation of D(+)-carnitine to 3-dehydrocarnitine as initial step of D(+)-carnitine degradation. The NAD(+)-specific, cytosolic enzyme was purified 126-fold to apparent electrophoretic homogeneity by 4 chromatographic steps. The molecular mass of the native enzyme was estimated to be 88 kDa by size-exclusion chromatography. It seems to be composed of 3 identical subunits with a relative molecular mass of 28 kDa as found by sodium dodecyl sulfate polyacrylamide gel electrophoresis and laser-induced mass spectrometry. The isoelectric point was found to be 4.7-5.0. The optimum temperature is 37 degrees C and the optimum pH for the oxidation and the reduction reaction are 9.0-9.5 and 5.5-6.5, respectively. The purified enzyme was further characterized with respect to substrate specificity, kinetic parameters and amino terminal sequence. Analogues of D(+)-carnitine (L(-)-carnitine, crotonobetaine, gamma-butyrobetaine, carnitine amide, glycine betaine, choline) are competitive inhibitors of D(+)-carnitine oxidation. The equilibrium constant of the reaction of D(+)-carnitine dehydrogenase was determined to be 2.2 x 10(-12). The purified D(+)-carnitine dehydrogenase has ...Continue Reading

References

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Jul 1, 1988·The Analyst·J Bounoure, J Souppe
Sep 1, 1994·Molecular Microbiology·K EichlerM A Mandrand-Berthelot
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Citations

Mar 20, 2015·Microbiology·Jamie A Meadows, Matthew J Wargo
Jun 17, 2014·The FEBS Journal·Meriyem AktasFranz Narberhaus
Oct 21, 1999·Analytical Biochemistry·J M ObónJ L Iborra
Jan 8, 2008·Bioscience, Biotechnology, and Biochemistry·Maizom HassanNobuhiro Mori
Mar 31, 2018·International Journal of Molecular Sciences·Abdallah GhonimyQiuju Wang

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