Moeglich, Andreas and Koch, Brigitte and Gronwald, Wolfram and Hengstenberg, Wolfgang and Brunner, Eike and Kalbitzer, Hans Robert (2004) Solution structure of the active-centre mutant I14A of the histidine-containing phosphocarrier protein from Staphylococcus carnosus. EUROPEAN JOURNAL OF BIOCHEMISTRY, 271 (23-24). pp. 4815-4824. ISSN 0014-2956,
Full text not available from this repository. (Request a copy)Abstract
High-pressure NMR experiments performed on the histidine-containing phosphocarrier protein (HPr) from Staphylococcus carnosus have shown that residue Ile14, which is located in the active-centre loop, exhibits a peculiarly small pressure response. In contrast, the rest of the loop shows strong pressure effects as is expected for typical protein interaction sites. To elucidate the structural role of this residue, the mutant protein HPr(I14A), in which Ile14 is replaced by Ala, was produced and studied by solution NMR spectroscopy. On the basis of 1406 structural restraints including 20 directly detected hydrogen bonds, 49 H-1(N)-N-15, and 25 H-1(N)-H-1(alpha) residual dipolar couplings, a well resolved three-dimensional structure could be determined. The overall fold of the protein is not influenced by the mutation but characteristic conformational changes are introduced into the active-centre loop. They lead to a displacement of the ring system of His15 and a distortion of the N-terminus of the first helix, which supports the histidine ring. In addition, the C-terminal helix is bent because the side chain of Leu86 located at the end of this helix partly fills the hydrophobic cavity created by the mutation. Xenon, which is known to occupy hydrophobic cavities, causes a partial reversal of the mutation-induced structural effects. The observed structural changes explain the reduced phosphocarrier activity of the mutant and agree well with the earlier suggestion that Ile14 represents an anchoring point stabilizing the active-centre loop in its correct conformation.
| Item Type: | Article |
|---|---|
| Uncontrolled Keywords: | RESIDUAL DIPOLAR COUPLINGS; NUCLEAR-MAGNETIC-RESONANCE; HIGH-RESOLUTION STRUCTURE; RESTRAINED MOLECULAR-DYNAMICS; CARBON CATABOLITE REPRESSION; SITE-DIRECTED MUTAGENESIS; LIQUID-CRYSTALLINE PHASE; PHOSPHOTRANSFERASE SYSTEM; ENTEROCOCCUS-FAECALIS; BACILLUS-SUBTILIS; histidine-containing phosphocarrier protein (HPr); mutant protein; nuclear magnetic resonance (NMR); protein structure |
| Subjects: | 500 Science > 570 Life sciences |
| Divisions: | Biology, Preclinical Medicine > Institut für Biophysik und physikalische Biochemie > Prof. Dr. Dr. Hans Robert Kalbitzer |
| Depositing User: | Dr. Gernot Deinzer |
| Date Deposited: | 21 Jun 2021 10:35 |
| Last Modified: | 21 Jun 2021 10:35 |
| URI: | https://pred.uni-regensburg.de/id/eprint/36893 |
Actions (login required)
 |
View Item |
