7Z4M

Plasmodium falciparum pyruvate kinase complexed with Mg2+ and K+

Summary for 7Z4M

• Entry DOI: 10.2210/pdb7z4m/pdb
• Related: 7Z4N 7Z4Q 7Z4R
• Descriptor: Pyruvate kinase, MAGNESIUM ION, POTASSIUM ION, ... (6 entities in total)
• Functional Keywords: redox regulation, glycolysis, malaria, drug-target, transferase
• Biological source: Plasmodium falciparum 3D7
• Total number of polymer chains: 1
• Total formula weight: 57261.74

Authors

Dillenberger, M.,Rahlfs, S.,Becker, K.,Fritz-Wolf, K. (deposition date: 2022-03-04, release date: 2022-08-24, Last modification date: 2024-01-31)

Primary citation

Dillenberger, M.,Rahlfs, S.,Becker, K.,Fritz-Wolf, K.
Prominent role of cysteine residues C49 and C343 in regulating Plasmodium falciparum pyruvate kinase activity.
Structure, 30:1452-, 2022

PubMed Abstract: The protozoan parasite Plasmodium falciparum causes the most severe form of malaria and is highly dependent on glycolysis. Glycolytic enzymes were shown to be massively redox regulated, inter alia via oxidative post-translational modifications (oxPTMs) of their cysteine residues. In this study, we identified P. falciparum pyruvate kinase (PfPK) C49 and C343 as amino acid residues essentially involved in maintaining structural and functional integrity of the enzyme. The mutation of these cysteines resulted in an altered substrate affinity, lower enzymatic activities, and, as studied by X-ray crystallography, conformational changes within the A-domain where the substrate binding site is located. Although the loss of a cysteine evoked an impaired catalysis in both mutants, the effects observed for mutant C49A were more severe: multiple conformational changes, caused by the loss of two hydrogen bonds, impeded proper substrate binding and thus the transfer of phosphate upon catalysis.

PubMed: 35998635
DOI: 10.1016/j.str.2022.08.001

Experimental method

X-RAY DIFFRACTION (1.9 Å)