Structural Investigation of a Dimeric Variant of Pyruvate Kinase Muscle Isoform 2
- Univ. of Iowa, Iowa City, IA (United States)
- Univ. of Missouri—Columbia, MO (United States)
Pyruvate kinase muscle isoform 2 (PKM2) catalyzes the terminal step in glycolysis, transferring a phosphoryl group from phosphoenolpyruvate to ADP, to produce pyruvate and ATP. PKM2 activity is allosterically regulated by fructose 1,6-bisphosphate (FBP), an upstream glycolytic intermediate. FBP stabilizes the tetrameric form of the enzyme. In its absence, the PKM2 tetramers dissociate, yielding a dimer–monomer mixture having lower enzymatic activity. Here, the S437Y variant of PKM2 is incapable of binding FBP. Consistent with that defect, we find that S437Y exists in a monomer–dimer equilibrium in solution, with a Kd of ~20 μM. Interestingly, however, the protein crystallizes as a tetramer, providing insight into the structural basis for impaired FBP binding of S437Y.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation
- Grant/Contract Number:
- AC02-05CH11231
- OSTI ID:
- 1423366
- Journal Information:
- Biochemistry, Journal Name: Biochemistry Journal Issue: 50 Vol. 56; ISSN 0006-2960
- Publisher:
- American Chemical Society (ACS)Copyright Statement
- Country of Publication:
- United States
- Language:
- ENGLISH
Purification and Characterization of Prolyl Hydroxylase 3/Pyruvate Kinase Isoform 2 Protein Complex
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journal | November 2019 |
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