Premium
Crystal structures of two mutants of adenylate kinase from Escherichia coli that modify the Gly‐loop
Author(s) -
Müller Christoph W.,
Schulz Georg E.
Publication year - 1993
Publication title -
proteins: structure, function, and bioinformatics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.699
H-Index - 191
eISSN - 1097-0134
pISSN - 0887-3585
DOI - 10.1002/prot.340150106
Subject(s) - adenylate kinase , mutant , escherichia coli , gtp' , kinase , crystallography , nucleotide , wild type , chemistry , transferase , crystal (programming language) , biology , biochemistry , stereochemistry , enzyme , gene , computer science , programming language
Two mutants of adenylate kinase from Escherichia coli have been crystallized and analyzed by X‐ray diffraction at resolutions of 3.4 and 2.4 Å, respectively. These mutants are Pro‐9→Leu and Gly‐10→Val. They were selected for their positions in the highly conserved Gly‐loop forming a giant anion hole for the β‐phosphate of ATP (GTP) in adenylate kinases, H‐ ras ‐p21, and other nucleotide‐binding proteins. Mutants at these positions of H‐ ras ‐p21 cause cancer. In adenylate kinase these mutations cause smallish changes at the active site. Relating the structural changes to the known changes in catalysis indicates that these mutants hinder the induced‐fit movements. As a side result we find that mutant Pro‐9→Leu and wild‐type form one very similar crystal packing contact that is crystallographic in one case and noncrystallographic in the other, while all other packing contacts and the space groups are quite at variance. © 1993 Wiley‐Liss, Inc.