Crystal structure of calcium-free proteinase K at 1.5-A resolution.Muller, A., Hinrichs, W., Wolf, W.M., Saenger, W.
(1994) J.Biol.Chem. 269: 23108-23111
- PubMed: 8083213
- DOI: 10.2210/pdb2pkc/pdb
- PubMed Abstract:
- Long-Range Structural Changes in Proteinase K Triggered by Calcium Ion Removal
Bajorath, J.,Raghunathan, S.,Hinrichs, W.,Saenger, W.
(1989) Nature 337: 481
- Three-Dimensional Structure of Proteinase K at 0.15-Nm Resolution
Betzel, C.,Pal, G.P.,Saenger, W.
(1986) Eur.J.Biochem. 178: 155
Proteinase K from the fungus Tritirachium album Limber binds two Ca2+ ions, one strongly (Ca 1) and the other weakly (Ca 2). Removal of these cations reduces the stability of proteinase K as shown by thermal denaturation, but the proteolytic activity ...
Proteinase K from the fungus Tritirachium album Limber binds two Ca2+ ions, one strongly (Ca 1) and the other weakly (Ca 2). Removal of these cations reduces the stability of proteinase K as shown by thermal denaturation, but the proteolytic activity is unchanged. The x-ray structures of native and Ca(2+)-free proteinase K at 1.5-A resolution show that there are no cuts in the polypeptide backbone (i.e. no autolysis), Ca 1 has been replaced by Na+, while Ca 2 has been substituted by a water associated with a larger but locally confined structural change at that site. A small but concerted geometrical shift is transmitted from the Ca 1 site via eight secondary structure elements to the substrate recognition site (Gly100-Tyr104, and Ser132-Gly136) but not to the catalytic triad (Asp39,His69,Ser224). This is accompanied by positional changes of localized waters.
Institut für Kristallographie, Freie Universität Berlin, Federal Republic of Germany.