The S variant of the human alpha 1-antitrypsin with E-264----V, is responsible for a mild alpha 1-antitrypsin deficiency quite common in the European population. S protein specifically cleaved at the susceptible peptide bond was crystallized and its ...
The S variant of the human alpha 1-antitrypsin with E-264----V, is responsible for a mild alpha 1-antitrypsin deficiency quite common in the European population. S protein specifically cleaved at the susceptible peptide bond was crystallized and its crystal structure determined and refined to 3.1 A resolution. The S variant crystallizes isomorphous to the normal M variant. The difference Fourier electron density map shows the E----V change as outstanding residual density. In addition, small structural changes of the main polypeptide chain radiate from the site of mutation and affect parts far removed from it. By the mutation, internal hydrogen bonds and salt linkages of E-264 to Y-38 and K-487, respectively, are lost. They cause the far-reaching slight distortions and are probably related to the reduced thermal stability of the S mutant. They may also be responsible for slower folding of the polypeptide chain and the clinical symptoms of alpha 1-antitrypsin deficiency. In a theoretical study by molecular dynamics methods simulations of the M and S proteins were made and the results analysed with respect to structural and dynamic properties and compared with the experimental results. There is a significant correlation between experimental and theoretical results in some respects.
Related Citations:
Human Alpha1-Proteinase Inhibitor. Crystal Structure Analysis of Two Crystal Modifications, Molecular Model and Preliminary Analysis of the Implications for Function Loebermann, H.,Tokuoka, R.,Deisenhofer, J.,Huber, R. (1984) J.Mol.Biol. 177: 531
Studies on the Oligosaccharide Chains of Human Alpha1-Protease Inhibitor. II. Structure of Oligosaccharides Mega, T.,Lujan, E.,Yoshida, A. (1980) J.Biol.Chem. 255: 4057
Interaction of Human Alpha1-Proteinase Inhibitor with Chymotrypsinogena and Crystallization of a Proteolytically Modified Alpha1-Proteinase Inhibitor Loebermann, H.,Lottspeich, F.,Bode, W.,Huber, R. (1982) Hoppe-Seyler's Z.Physiol.Chem. 363: 1377
The Biosynthesis of Rat Alpha1-Antitrypsin Carlson, J.,Stenflo, J. (1982) J.Biol.Chem. 257: 12987
Human Alpha1-Antitrypsin. Carbohydrate Attachment and Sequence Homology Carrell, R.W.,Jeppsson, J.-O.,Vaughan, L.,Brennan, S.O.,Owen, M.C.,Boswell, D.R. (1981) FEBS Lett. 135: 301
Organizational Affiliation:
Max-Planck-Institut für Biochemie, Martinsried, FRG.
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