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      The Oxidative Half-reaction of Old Yellow Enzyme : THE ROLE OF TYROSINE 196

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      Journal of Biological Chemistry
      American Society for Biochemistry & Molecular Biology (ASBMB)

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          A new old yellow enzyme of Saccharomyces cerevisiae.

          In 1993, the first gene of Old Yellow Enzyme (OYE) of Saccharomyces cerevisiae was cloned (Stott, K., Saito, K., Thiele, D. J., and Massey, V. (1993) J. Biol. Chem. 268, 6097-6106) and named OYE2 to distinguish it from the first OYE gene cloned from Saccharomyces carlsbergenesis (Saito, K., Thiele, D. J., Davio, M., Lockridge, O., and Massey, V. (1991) J. Biol. Chem. 266, 20720-20724). The analysis of an OYE2 deletion mutant suggested that S. cerevisiae had at least two OYE genes. In the present study, we cloned a new OYE species named OYE3 and analyzed the OYE3 protein expressed in Escherichia coli. OYE3 consists of 400 amino acid residues and its molecular mass calculated by electrospray mass spectrometry is 44,788 daltons, in good agreement with the value of 44,920 daltons predicted from the amino acid sequence derived from the DNA sequence. In the downstream region of the OYE3 gene, the cytochrome oxidase (COX10) gene exists with a 426-base pair intermediate sequence. Some of the physicochemical and kinetic properties of OYE2 and OYE3 have been determined. Although the two enzymes are clearly closely related, they show differences in ligand binding properties and in their catalytic activities with oxygen and cyclohexen-2-one as acceptors.
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            Sequence and properties of pentaerythritol tetranitrate reductase from Enterobacter cloacae PB2.

            Pentaerythritol tetranitrate reductase, which reductively liberates nitrite from nitrate esters, is related to old yellow enzyme. Pentaerythritol tetranitrate reductase follows a ping-pong mechanism with competitive substrate inhibition by NADPH, is strongly inhibited by steroids, and is capable of reducing the unsaturated bond of 2-cyclohexen-1-one.
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              On the Active Site of Old Yellow Enzyme

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                Author and article information

                Journal
                Journal of Biological Chemistry
                J. Biol. Chem.
                American Society for Biochemistry & Molecular Biology (ASBMB)
                0021-9258
                1083-351X
                December 04 1998
                December 04 1998
                December 04 1998
                December 04 1998
                : 273
                : 49
                : 32763-32770
                Article
                10.1074/jbc.273.49.32763
                9830020
                baf81fb8-fa6a-412d-afca-9b0c5777f066
                © 1998
                History

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