Polymerization in the actin ATPase clan regulates hexokinase activity in yeast.

Polymerization in the actin ATPase clan regulates hexokinase activity in yeast.
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DOI:
10.1126/science.aay5359
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发表时间:
2020-02-28
期刊:
Science (New York, N.Y.)
影响因子:
--
通讯作者:
Garner EC
Garner EC
中科院分区:
其他
文献类型:
--
作者:
Stoddard PR;Lynch EM;Farrell DP;Dosey AM;DiMaio F;Williams TA;Kollman JM;Murray AW;Garner EC

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The actin fold is found in cytoskeletal polymers, chaperones, and various metabolic enzymes. Many actin-fold proteins, like the carbohydrate kinases, do not polymerize. We found that Glk1, a Saccharomyces cerevisiae glucokinase, forms two-stranded filaments with unique ultrastructure, distinct from other 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. Mutation eliminating Glk1 polymerization alleviated concentration-dependent enzyme inhibition. Yeast containing non-polymerizing 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. Yeast glucokinase activity is limited by its polymerization, which is critical for cell viability during glucose refeeding.
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