Mechanism of Chorismate Mutase: Contribution of Conformational Restriction to Catalysis in the Claisen Rearrangement
作者:Nikolai A. Khanjin、James P. Snyder、F. M. Menger
DOI:10.1021/ja992453d
日期:1999.12.1
The mechanism of the enzyme- and antibody-catalyzed Claisenrearrangement of chorismate to prephenate was investigated experimentally on model compounds and by using quantum chemistry calculations at the Becke3LYP/6-31G* level of theory. Conformational restriction of the allyl vinyl ether fragment to the reactive chairlike conformation in 1 induces a 2 × 105-fold rate acceleration (ΔΔG⧧ = 7.3 kcal/mol)