Summary for 2ABH
| Entry DOI | 10.2210/pdb2abh/pdb |
| Descriptor | PHOSPHATE-BINDING PROTEIN, PHOSPHATE ION (3 entities in total) |
| Functional Keywords | phosphotransferase, transport |
| Biological source | Escherichia coli |
| Cellular location | Periplasm: P06128 |
| Total number of polymer chains | 1 |
| Total formula weight | 34552.57 |
| Authors | Yao, N.,Choudhary, A.,Ledvina, P.S.,Quiocho, F.A. (deposition date: 1995-11-28, release date: 1997-04-21, Last modification date: 2024-02-14) |
| Primary citation | Yao, N.,Ledvina, P.S.,Choudhary, A.,Quiocho, F.A. Modulation of a salt link does not affect binding of phosphate to its specific active transport receptor. Biochemistry, 35:2079-2085, 1996 Cited by PubMed Abstract: Electrostatic interactions are among the key forces determining the structure and function of proteins. These are exemplified in the liganded form of the receptor, a phosphate binding protein from Escherichia coli. The phosphate, completely dehydrated and buried in the receptor, is bound by 12 hydrogen bonds as well as a salt link with Arg 135. We have modulated the ionic attraction while preserving the hydrogen bonds by mutating Asp 137, also salt linked to Arg 135, to Asn, Gly or Thr. High-resolution crystallographic analysis revealed that Gly and Thr (but not Asn) mutant proteins have incorporated a more electronegative Cl- in place of the Asp carboxylate. That no dramatic effect on phosphate affinity was produced by these ionic perturbations indicates a major role for hydrogen bonds and other local dipoles in the binding and charge stabilization of ionic ligands. PubMed: 8652549DOI: 10.1021/bi952686r PDB entries with the same primary citation |
| Experimental method | X-RAY DIFFRACTION (1.7 Å) |
Structure validation
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