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Modeling of interactions between functional domains of ALDH1L1.

Chem. Biol. Interact.2017 Oct 01;276:23-30. Epub 2017 Apr 14
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摘要


ALDH1L1, a member of the aldehyde dehydrogenase superfamily of enzymes, catalyzes the conversion of 10-formyltetrahydrofolate to tetrahydrofolate and CO2. The enzyme is a tetramer of identical subunits, with each subunit consisting of three functional domains that originated from unrelated genes. The N- and C-terminal domains are catalytic, while the intermediate domain transfers the reaction intermediate from the N- to the C-terminal domain. The intermediate domain is an acyl carrier protein, possessing the covalently attached 4'-phosphopantetheine (4-PP) prosthetic group. This prosthetic group is known to function as a swinging arm transferring intermediates between enzymes in complex biosynthetic reactions. Here we have applied computer modeling using available structures of the three functional domains of ALDH1L1 to evaluate the extent of flexibility within the full-length protein. This approach allowed us to define positions of the 4-PP arm within the two catalytic domains and to predict N-terminal:intermediate and intermediate:C-terminal domain interfaces. Our models further suggested high degree of flexibility within the full-length enzyme.

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