Download MendeleyCalcium-independent subtilisin by design.
Gallagher, T., Bryan, P., Gilliland, G.L.(1993) Proteins 16: 205-213
- PubMed: 8332608
- DOI: https://doi.org/10.1002/prot.340160207
- Primary Citation of Related Structures:
1SUB, 1SUC, 1SUD - PubMed Abstract:
A version of subtilisin BPN' lacking the high affinity calcium site (site A) has been produced through genetic engineering methods, and its crystal structure refined at 1.8 A resolution. This protein and the corresponding version containing the calcium A site are described and compared. The deletion of residues 75-83 was made in the context of four site-specific replacements previously shown to stabilize subtilisin. The helix that in wild type is interrupted by the calcium binding loop, is continuous in the deletion mutant, with normal geometry. A few residues adjacent to the loop, principally those that were involved in calcium coordination, are repositioned and/or destabilized by the deletion. Because refolding is greatly facilitated by the absence of the Ca-loop, this protein offers a new vehicle for analysis and dissection of the folding reaction. This is among the largest internal changes to a protein to be described at atomic resolution.
Organizational Affiliation:
Center for Advanced Research in Biotechnology, Maryland Biotechnology Institute, University of Maryland, Shady Grove 20850.
