7N3R image
Entry Detail
PDB ID:
7N3R
Keywords:
Title:
The ternary complex of human Bisphosphoglycerate mutase with 3-phosphoglycerate and 2-phosphoglycolate
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2021-06-01
Release Date:
2022-04-13
Method Details:
Experimental Method:
Resolution:
2.25 Å
R-Value Free:
0.27
R-Value Work:
0.20
R-Value Observed:
0.20
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Bisphosphoglycerate mutase
Chain IDs:A, B
Chain Length:267
Number of Molecules:2
Biological Source:Homo sapiens
Primary Citation
Molecular insight into 2-phosphoglycolate activation of the phosphatase activity of bisphosphoglycerate mutase.
Acta Crystallogr D Struct Biol 78 472 482 (2022)
PMID: 35362470 DOI: 10.1107/S2059798322001802

Abstact

Bisphosphoglycerate mutase (BPGM) is an erythrocyte-specific multifunctional enzyme that is responsible for the regulation of 2,3-bisphosphoglycerate (2,3-BPG) in red blood cells through its synthase and phosphatase activities; the latter enzymatic function is stimulated by the endogenous activator 2-phosphoglycolate (2-PG). 2,3-BPG is a natural allosteric effector of hemoglobin (Hb) that is responsible for decreasing the affinity of Hb for oxygen to facilitate tissue oxygenation. Here, crystal structures of BPGM with 2-PG in the presence and absence of 3-phosphoglycerate are reported at 2.25 and 2.48 Å resolution, respectively. Structure analysis revealed a new binding site for 2-PG at the dimer interface for the first time, in addition to the expected active-site binding. Also, conformational non-equivalence of the two active sites was observed as one of the sites was found in an open conformation, with the residues at the active-site entrance, including Arg100, Arg116 and Arg117, and the C-terminus disordered. The kinetic result is consistent with the binding of 2-PG to an allosteric or noncatalytic site as well as the active site. This study paves the way for the rational targeting of BPGM for therapeutic purposes, especially for the treatment of sickle cell disease.

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