Enantioselective Reductive Amination of α-Keto Acids to α-Amino Acids by a Pyridoxamine Cofactor in a Protein Cavity
作者:Hao Kuang、Matthew L. Brown、Ronald R. Davies、Eva C. Young、Mark D. Distefano
DOI:10.1021/ja954271z
日期:1996.1.1
Adipocyte lipid binding protein (ALBP) is a small 131 residue protein with a simple architecture that consists of two orthogonal planes of β-sheet secondary structure. This protein binds a variety of fatty acids in a large cavity formed between the two sheets such that the bound ligands are completely enclosed within the protein. In this paper, the synthesis of an ALBP conjugate (ALBP-PX) containing
Reversal of optical induction in transamination by regioisomeric bifunctionalized cyclodextrins
作者:Elisabetta Fasella、Steven D. Dong、Ronald Breslow
DOI:10.1016/s0968-0896(98)00193-x
日期:1999.5
addition from their side, rather than acting to protonate the transamination intermediates. Related cyclodextrin-pyridoxamine compounds had been reported carrying ethylenediamine units instead of imidazoles, and high enantioselectivities in transamination were claimed. Our work indicates that these claims are incorrect, and that only poor selectivities are seen that are often unrelated to the position of the
Hexadeoxycycloheptaamylose-pyridoxamine, an artifical transaminase with a “deeper” binding pocket
作者:Anthony W. Czarnik、Ronald Breslow
DOI:10.1016/0008-6215(84)85091-0
日期:1984.5
Cycloheptaamylose was converted in four steps into a monosulfonylated, hexadeoxy derivative that, on treatment with pyridoxaminethiol, provided an artificial transaminase with activity similar to that found in the nondeoxygenated analogue. Characterization of the intermediate hexadeoxycycloheptaamylose was facilitated by the use of field-desorption mass spectrometry, which was uniquely able to distinguish