Essential arginine residues occur in or near the catalytic site of L-amino acid oxidase |
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Authors: | M F Christman Janet M Cardenas |
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Institution: | (1) The Department of Chemistry, University of North Carolina, 27514 Chapel Hill, North Carolina, USA;(2) National Eye Institute, National Institutes of Health, Bldg 31, Rm 6A49, 20205 Bethesda, MD, USA |
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Abstract: | Summary Butanedione in borate buffer irreversibly inactivates L-amino acid oxidase. L-Phenylalanine and L-methionine, which are good
substrates for the enzyme, protect against inactivation but glycine, which is a very poor substrate, and D-phenylalanine,
which is neither substrate nor inhibitor, do not provide significant protection. These results are consistent with the modification
by butanedione of one or more arginine residues located in or near the catalytic site of L-amino acid oxidase.
Acknowledgments. We thank Drs D. Porter and S. Johnson for advice and assistance; Ms D. Hurt for electrophoretic analyses
of protein samples; NIH for grant No. AM-25247, and NSF for grant No. SP176-83182. |
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