1dm4
From Proteopedia
SER195ALA MUTANT OF HUMAN THROMBIN COMPLEXED WITH FIBRINOPEPTIDE A (7-16)
Overview
The Ser195Ala mutant of human alpha-thrombin was complexed with fibrinopeptide A(7-22) (FPA) in an effort to describe the (P1'-P6') post-cleavage binding subsites of the fibrinogen-recognition exosite and define more clearly the nature of the Michaelis complex and the scissile peptide bond bound at the catalytic site. The thrombin mutant, however, has residual catalytic activity and proteolysis occurred at the Arg16-Gly17 bond. Thus, the structure of the thrombin complex determined was that of FPA(7-16) bound at the active site, which is very similar to the ternary FPA(7-16)cmk-human thrombin-hirugen complex (r.m.s.d. approximately 0.4 A; Stubbs et al. , 1992). It is further shown by subsidiary experiments that the cleavage is the result of residual catalytic activity of the altered catalytic machinery.
About this Structure
1DM4 is a Protein complex structure of sequences from Homo sapiens. Full crystallographic information is available from OCA.
Reference
Structure of the Ser195Ala mutant of human alpha--thrombin complexed with fibrinopeptide A(7--16): evidence for residual catalytic activity., Krishnan R, Sadler JE, Tulinsky A, Acta Crystallogr D Biol Crystallogr. 2000 Apr;56(Pt 4):406-10. PMID:10739913 Page seeded by OCA on Fri May 2 14:00:32 2008
