Independent locations of kinase and 3'-phosphatase activities on T4 polynucleotide kinase. Journal Article uri icon



  • We have used two chemical modification reagents and three proteases to study the relationship between the two activities of T4 polynucleotide kinase. In each case, conditions were found where one of the two activities of the enzyme could be eliminated without greatly reducing the other. Taken together, these data indicate that the two activities are catalyzed by amino acid residues located in separate active sites on the polypeptide chain. Specific exopeptidase digestion indicates that the kinase activity lies in the NH2-terminal and the phosphatase in the COOH-terminal portion of the polypeptide chain. Partial trypsin digestion produces a 29,000-dalton fragment with no kinase activity and nearly normal 3'-phosphatase activity.

publication date

  • October 10, 1982

Date in CU Experts

  • March 13, 2015 12:57 PM

Full Author List

  • Soltis DA; Uhlenbeck OC

author count

  • 2

Other Profiles

International Standard Serial Number (ISSN)

  • 0021-9258

Additional Document Info

start page

  • 11340

end page

  • 11345


  • 257


  • 19