Solution nuclear magnetic resonance structure of membrane-integral diacylglycerol kinase.
Solution nuclear magnetic resonance structure of membrane-integral diacylglycerol kinase.
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DOI:
10.1126/science.1171716
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发表时间:
2009-06-26
期刊:
影响因子:
--
通讯作者:
Sanders CR
中科院分区:
文献类型:
--
作者:
Van Horn WD;Kim HJ;Ellis CD;Hadziselimovic A;Sulistijo ES;Karra MD;Tian C;Sönnichsen FD;Sanders CR
Escherichia coli diacylglycerol kinase (DAGK) represents a family of integral membrane enzymes that is unrelated to all other phosphotransferases. We have determined the three-dimensional structure of the DAGK homotrimer using solution NMR. The third transmembrane helix from each subunit is domain-swapped with the first and second transmembrane segments from an adjacent subunit. Each of DAGK’s three active sites resembles a portico. The cornice of the portico appears to be the determinant of DAGK’s lipid substrate specificity and overhangs the site of phosphoryl transfer near the water-membrane interface. Mutations to cysteine that caused severe misfolding were located in or near the active site, indicating a high degree of overlap between sites responsible for folding and for catalysis.
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