ENZYMATIC CATALYSIS IN HETEROGENOUS MIXTURES OF SUBSTRATES - THE ROLE OF THE LIQUID-PHASE AND THE EFFECTS OF ADJUVANTS

被引:45
作者
LOPEZFANDINO, R [1 ]
GILL, I [1 ]
VULFSON, EN [1 ]
机构
[1] AFRC, FOOD RES INST, DEPT BIOTECHNOL & ENZYMOL, READING RG6 2EF, ENGLAND
关键词
BIOCATALYSIS NONAQUEOUS; PEPTIDE SYNTHESIS; EUTECTIC MIXTURES; SUBTILISIN;
D O I
10.1002/bit.260431104
中图分类号
Q81 [生物工程学(生物技术)]; Q93 [微生物学];
学科分类号
071005 ; 0836 ; 090102 ; 100705 ;
摘要
The physicochemical mechanism of protease-catalyzed peptide synthesis in heterogenous eutectic mixtures of substrates has been examined by a combination of microscopic techniques. Using a number of model reactions of dipeptide amide synthesis, it was determined that liquid phase catalysis was mostly, if not exclusively, responsible for the observed conversion of substrates. Furthermore, the formation of liquid or semiliquid eutectics was an important requirement for the occurrence of those reactions where both substrates were solids in the pure state. The addition of small quantities of hydrophilic solvents (adjuvants) often resulted in significant improvements in the rates and yields of the reactions. This was due to the ability of these adjuvants to promote the formation of eutectics, thereby increasing the proportion, as well as affecting the composition and properties of the liquid phase. (C) 1994 John Wiley & Sons, Inc.
引用
收藏
页码:1016 / 1023
页数:8
相关论文
共 30 条
[1]   ENZYME CATALYZED PREPARATION OF 6-O-ACYLGLUCOPYRANOSIDES [J].
ADELHORST, K ;
BJORKLING, F ;
GODTFREDSEN, SE ;
KIRK, O .
SYNTHESIS-STUTTGART, 1990, (02) :112-115
[2]  
BEDNARSKI MD, 1991, ACS S SERIES, V466
[3]  
Boucher E., 1982, PROPERTIES LIQUIDS S
[4]   OPTIMIZATION OF ORGANIC-SOLVENT IN MULTIPHASE BIOCATALYSIS [J].
BRINK, LES ;
TRAMPER, J .
BIOTECHNOLOGY AND BIOENGINEERING, 1985, 27 (08) :1258-1269
[5]   RECENT ADVANCES IN THE GENERATION OF CHIRAL INTERMEDIATES USING ENZYMES [J].
DAVIES, HG ;
GREEN, RH ;
KELLY, DR ;
ROBERTS, SM .
CRITICAL REVIEWS IN BIOTECHNOLOGY, 1990, 10 (02) :129-153
[6]   ENZYMATIC CATALYSIS IN MONOPHASIC ORGANIC-SOLVENTS [J].
DORDICK, JS .
ENZYME AND MICROBIAL TECHNOLOGY, 1989, 11 (04) :194-211
[7]  
FIESER ZF, 1967, REAGENTS ORGANIC SYN, P1158
[8]   ENZYMATIC SOLVENT-FREE SYNTHESIS OF SUGAR ACETAL FATTY-ACID ESTERS [J].
FREGAPANE, G ;
SARNEY, DB ;
VULFSON, EN .
ENZYME AND MICROBIAL TECHNOLOGY, 1991, 13 (10) :796-800
[9]   ENZYMATIC-SYNTHESIS OF SHORT PEPTIDES IN HETEROGENEOUS MIXTURES OF SUBSTRATES [J].
GILL, I ;
VULFSON, EN .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1993, 115 (08) :3348-3349
[10]  
JONES JB, 1986, TETRAHEDRON, V42, P539