6P4X image
Entry Detail
PDB ID:
6P4X
Keywords:
Title:
Crystal Structure of the S. cerevisiae glucokinase, Glk1
Biological Source:
PDB Version:
Deposition Date:
2019-05-28
Release Date:
2020-03-11
Method Details:
Experimental Method:
Resolution:
3.59 Å
R-Value Free:
0.30
R-Value Work:
0.26
R-Value Observed:
0.26
Space Group:
P 43 21 2
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Glucokinase-1
Chain IDs:A, B, C, D, E, F
Chain Length:500
Number of Molecules:6
Biological Source:Saccharomyces cerevisiae (strain ATCC 204508 / S288c)
Ligand Molecules
Primary Citation
Polymerization in the actin ATPase clan regulates hexokinase activity in yeast.
Science 367 1039 1042 (2020)
PMID: 32108112 DOI: 10.1126/science.aay5359

Abstact

The actin fold is found in cytoskeletal polymers, chaperones, and various metabolic enzymes. Many actin-fold proteins, such as the carbohydrate kinases, do not polymerize. We found that Glk1, a Saccharomyces cerevisiae glucokinase, forms two-stranded filaments with ultrastructure that is distinct from that of cytoskeletal polymers. In cells, Glk1 polymerized upon sugar addition and depolymerized upon sugar withdrawal. Polymerization inhibits enzymatic activity; the Glk1 monomer-polymer equilibrium sets a maximum rate of glucose phosphorylation regardless of Glk1 concentration. A mutation that eliminated Glk1 polymerization alleviated concentration-dependent enzyme inhibition. Yeast containing nonpolymerizing Glk1 were less fit when growing on sugars and more likely to die when refed glucose. Glk1 polymerization arose independently from other actin-related filaments and may allow yeast to rapidly modulate glucokinase activity as nutrient availability changes.

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