Abstract:
:p60src, the transforming protein of Rous sarcoma virus (RSV), is a protein kinase that has a strict specificity for tyrosine. The phosphorylation of cellular proteins by p60src (ref. 4) results in transformation. Recently, Barker and Dayhoff discovered that residues 259-485 of p60src have 22% sequence identity with residues 33-258 of the catalytic subunit of cyclic AMP-dependent protein kinase, an enzyme that has a specificity for serine. Because it was necessary to introduce eight gaps to align the two proteins, the question remained as to whether this apparent homology reflected a common evolutionary origin. We demonstrate here that the ATP analogue p-fluorosulphonylbenzoyl 5'-adenosine (FSBA) inactivates the tyrosine protein kinase activity of p60src by reacting with lysine 295. When aligned for maximum sequence identity, lysine 295 of p60src and the lysine in the catalytic subunit which also reacts specifically with FSBA are superimposed precisely. This functional homology is strong evidence that the protein kinases, irrespective of amino acid substrate specificity, comprise a single divergent gene family.
journal_name
Naturejournal_title
Natureauthors
Kamps MP,Taylor SS,Sefton BMdoi
10.1038/310589a0subject
Has Abstractpub_date
1984-08-16 00:00:00pages
589-92issue
5978eissn
0028-0836issn
1476-4687journal_volume
310pub_type
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