2vgf
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HUMAN ERYTHROCYTE PYRUVATE KINASE: T384M MUTANT
OverviewOverview
Deficiency of human erythrocyte isozyme (RPK) is, together with, glucose-6-phosphate dehydrogenase deficiency, the most common cause of the, nonspherocytic hemolytic anemia. To provide a molecular framework to the, disease, we have solved the 2.7 A resolution crystal structure of human, RPK in complex with fructose 1,6-bisphosphate, the allosteric activator, and phosphoglycolate, a substrate analogue, and we have functionally and, structurally characterized eight mutants (G332S, G364D, T384M, D390N, R479H, R486W, R504L, and R532W) found in RPK-deficient patients. The, mutations target distinct regions of RPK structure, including domain, interfaces and catalytic and allosteric sites. The mutations affect to a, different extent thermostability, catalytic efficiency, and regulatory, properties. These studies are the first to correlate the clinical symptoms, with the molecular properties of the mutant enzymes. Mutations greatly, impairing thermostability and/or activity are associated with severe, anemia. Some mutant proteins exhibit moderate changes in the kinetic, parameters, which are sufficient to cause mild to severe anemia, underlining the crucial role of RPK for erythrocyte metabolism. Prediction, of the effects of mutations is difficult because there is no relation, between the nature and location of the replaced amino acid and the type of, molecular perturbation. Characterization of mutant proteins may serve as a, valuable tool to assist with diagnosis and genetic counseling.
About this StructureAbout this Structure
2VGF is a Single protein structure of sequence from Homo sapiens with , , and as ligands. This structure superseeds the now removed PDB entry 1LIW. Active as Pyruvate kinase, with EC number 2.7.1.40 Known structural/functional Sites: , , , , , , , , , , , , , , and . Full crystallographic information is available from OCA.
ReferenceReference
Structure and function of human erythrocyte pyruvate kinase. Molecular basis of nonspherocytic hemolytic anemia., Valentini G, Chiarelli LR, Fortin R, Dolzan M, Galizzi A, Abraham DJ, Wang C, Bianchi P, Zanella A, Mattevi A, J Biol Chem. 2002 Jun 28;277(26):23807-14. Epub 2002 Apr 17. PMID:11960989
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- Homo sapiens
- Pyruvate kinase
- Single protein
- Abraham, D.J.
- Bianchi, P.
- Chiarelli, L.
- Dolzan, M.
- Fortin, R.
- Galizzi, A.
- Mattevi, A.
- Valentini, G.
- Wang, C.
- Zanella, A.
- FBP
- K
- MN
- PGA
- Alternative splicing
- Disease mutation
- Glycolysis
- Kinase
- Magnesium
- Metal-binding
- Phosphorylation
- Polymorphism
- Pyruvate
- Pyruvate kinase in the active r-state
- Transferase