ISSN:
1399-0047
Source:
Crystallography Journals Online : IUCR Backfile Archive 1948-2001
Topics:
Chemistry and Pharmacology
,
Geosciences
,
Physics
Notes:
The Ser195Ala mutant of human α-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. ∼ 0.4 Å; 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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1107/S0907444900001487
