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1998:
Aleshin A E; Fromm H J; Honzatko R B
Multiple crystal forms of hexokinase I: new insights regarding conformational dynamics, subunit interactions, and membrane association.
FEBS letters 1998;
434(
1-2):.
Hexokinase I is comprised of homologous N- and C-terminal domains, and binds to the outer membrane of mitochondria. Reported here is the structure of a new crystal form of recombinant human hexokinase I, which complements existing crystal structures. Evidently, in some packing environments and even in the presence of glucose and glucose 6-phosphate the N-terminal domain (but not the C-terminal domain) can undergo oscillations between closed and partially opened conformations. Subunit interfaces, present in all known crystal forms of hexokinase I, promote the formation of linear chains of hexokinase I dimers. Presented is a model for membrane-associated hexokinase I, in which linear chains of hexokinase I dimers are stabilized by interactions with mitochondrial porin.
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