Location of a proton-donating group at the re-face of a β-d-galactosidase-bound, diastereotopic substrate
作者:Jochen Lehmann、Peter Schlesselmann
DOI:10.1016/0008-6215(83)88221-4
日期:1983.2
galacto -oct-2-enitol ( 1 ) was used as a diastereotopic probe, in order to elucidate the stereochemistry of protonation by β- d -galactosidase. Compound 1 can be converted by the enzyme into 1,2-dideoxy-2-deuterio- d - galacto -3-octulopyranose ( 2 ), which was submitted to periodate degradation. Propanoic acid derived from C-1, 2, and 3 of 2 has the ( S ) configuration, which proved the enzymic protonation
摘要为了阐明β质子化的立体化学,使用了(Z)-3,7-脱水-1,2-二脱氧-2-氘-半乳糖-半乳糖-辛-2-烯醇(1)作为非对映体探针。 -d-半乳糖苷酶。化合物1可以被酶转化为1,2-二脱氧-2-氘-半乳糖-3-八吡喃葡萄糖(2),使其发生过分降解。源自2的C-1、2和3的丙酸具有(S)构型,这证明1的酶促质子化完全是从背面发生的。