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Site Directed Mutagenesis to Probe for Active Site Components of Liver Mitochondrial Aldehyde Dehydrogenase

  • Henry Weiner
  • Jaume Farrés
  • Ujjwal J. Rout
  • Xinping Wang
  • Chao-Feng Zheng
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 372)

Abstract

Mammalian aldehyde dehydrogenase was first purified to homogeneity in our laboratory (Feldman and Weiner, 1972a). The enzyme, isolated from horse liver, was found to be an esterase as well as a non—specific NAD—dependent dehydrogenase. At that time we did not know that the enzyme we were studying (pI=5) was from mitochondria. We found a second minor form of the enzyme with a pI=6; later it was shown that this was the cytosolic form of the enzyme. During our initial attempts to purify the mitochondrial isoenzyme we found a third form with a pI value of 4.8. It had kinetic properties identical with those of the pI 5.0 enzyme form, but it was less stable when heated at 520C. As we became more experienced with isolating the enzyme we failed to identify the low pI form. Though never proven, we felt that this was a degraded form of the mitochondrial isoenzyme.

Keywords

Site Direct Mutagenesis Aldehyde Dehydrogenase General Base Active Site Cysteine Horse Liver 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1995

Authors and Affiliations

  • Henry Weiner
    • 1
  • Jaume Farrés
    • 1
  • Ujjwal J. Rout
    • 1
  • Xinping Wang
    • 1
  • Chao-Feng Zheng
    • 1
  1. 1.Biochemistry DepartmentPurdue UniversityW. LafayetteUSA

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