• Mechanistic studies on carboxypeptidase A from goat pancreas Part I: Role of tyrosine residue at the active site

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    • Keywords

       

      Tyrosine; active site; goat carboxypeptidase; iodine; N-acetylimidazole

    • Abstract

       

      Chemical modification of carboxypeptidase Ag1 from goat pancreas with Nacetylimidazole or iodine led to loss of enzymic activity. This loss in activity could be prevented when chemical modification was carried out in the presence of Β-phenylpropionic acid or substrate NCbz-glycyl-L-phenylalanine, thus suggesting a tyrosine residue at the active site. Chemical modification of tyrosine was confirmed by spectral and kinetic studies. While tyrosine modification destroyed peptidase activity, esterase activity of the enzyme remained unchanged thus indicating non-involvement of tyrosine residue in ester hydrolysis

    • Author Affiliations

       

      R D Dua1 Kamlesh Gupta1

      1. Biochemistry Laboratory, Department of Chemistry, Indian Institute of Technology, Hauz Khas, New Delhi - 110016, India
    • Dates

       
  • Journal of Biosciences | News

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