COMPARATIVE ROLES OF HISTIDINE-51 IN HUMAN BETA(1)BETA(1) AND THREONINE-51 IN PI-PI ALCOHOL DEHYDROGENASES

被引:22
作者
DAVIS, GJ
CARR, LG
HURLEY, TD
LI, TK
BOSRON, WF
机构
[1] INDIANA UNIV, SCH MED, DEPT BIOCHEM & MOLEC BIOL, INDIANAPOLIS, IN 46202 USA
[2] INDIANA UNIV, SCH MED, DEPT MED, INDIANAPOLIS, IN 46202 USA
关键词
D O I
10.1006/abbi.1994.1242
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Histidine at position 51 of the class I beta 1 alcohol dehydrogenase (ADH) functions as a general base by indirectly abstracting a proton from the alcohol substrate through a hydrogen-bonded proton relay system. The human class II pi-ADH was reported to be polymorphic, having either Ser or Thr, but not His at position 51. It is unknown whether Ser or Thr51 have a catalytic role in ethanol oxidation with pi-ADH. Accordingly, we expressed and purified recombinant mutants of pi-ADH with Thr, Ser, and His at position 51. At pH 6.5, values for V-max/K-m for ethanol were 0.30, 0.10, and 0.09 min(-1) mM(-1) for pi 51Thr, pi 51Ser, and pi 51His ADH, respectively. Hence the effects of the substitutions were much less than the 11-fold decrease in Vmax/K-m observed for beta(1)-ADH when a neutral amino acid (Gln) was substituted for His51. Addition of a buffer base (400 mM glycylglycine) had little effect on V-max/K-m of recombinant pi 51Thr or pi 51Ser ADH, while it increased V-max/K-m for ethanol 7-fold for the beta(1)51Gln ADH. We conclude that there is no evidence for Thr51 of pi-ADH participating in a proton relay similar to that seen in beta(1)-ADH and that a base at position 51 may not be a universal requirement for a functional alcohol dehydrogenase with a moderate efficiency for ethanol oxidation at a physiological pH. (C) 1994 Academic Press,Inc.
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页码:307 / 312
页数:6
相关论文
共 31 条
[1]   HUMAN-LIVER PI-ALCOHOL DEHYDROGENASE - KINETIC AND MOLECULAR-PROPERTIES [J].
BOSRON, WF ;
LI, TK ;
DAFELDECKER, WP ;
VALLEE, BL .
BIOCHEMISTRY, 1979, 18 (06) :1101-1105
[2]   HETEROGENEITY AND NEW MOLECULAR-FORMS OF HUMAN-LIVER ALCOHOL-DEHYDROGENASE [J].
BOSRON, WF ;
LI, TK ;
VALLEE, BL .
BIOCHEMICAL AND BIOPHYSICAL RESEARCH COMMUNICATIONS, 1979, 91 (04) :1549-1555
[3]   PURIFICATION AND STEADY-STATE KINETIC CHARACTERIZATION OF HUMAN-LIVER BETA-3-BETA-3 ALCOHOL-DEHYDROGENASE [J].
BURNELL, JC ;
LI, TK ;
BOSRON, WF .
BIOCHEMISTRY, 1989, 28 (17) :6810-6815
[4]   POLYMORPHISM OF THE RAT-LIVER MITOCHONDRIAL ALDEHYDE DEHYDROGENASE CDNA [J].
CARR, LG ;
MELLENCAMP, RJ ;
CRABB, DW ;
WEINER, H ;
LUMENG, L ;
LI, TK .
ALCOHOLISM-CLINICAL AND EXPERIMENTAL RESEARCH, 1991, 15 (05) :753-756
[5]  
CHOMCZYNSKI P, 1987, ANAL BIOCHEM, V162, P156, DOI 10.1016/0003-2697(87)90021-2
[6]  
Cleland W W, 1979, Methods Enzymol, V63, P103
[7]   GENERAL BASE CATALYSIS IN A GLUTAMINE FOR HISTIDINE MUTANT AT POSITION-51 OF HUMAN LIVER ALCOHOL-DEHYDROGENASE [J].
EHRIG, T ;
HURLEY, TD ;
EDENBERG, HJ ;
BOSRON, WF .
BIOCHEMISTRY, 1991, 30 (04) :1062-1068
[8]   COMPARISON OF 3 CLASSES OF HUMAN LIVER ALCOHOL-DEHYDROGENASE - EMPHASIS ON DIFFERENT SUBSTRATE BINDING POCKETS [J].
EKLUND, H ;
MULLERWILLE, P ;
HORJALES, E ;
FUTER, O ;
HOLMQUIST, B ;
VALLEE, BL ;
HOOG, JO ;
KAISER, R ;
JORNVALL, H .
EUROPEAN JOURNAL OF BIOCHEMISTRY, 1990, 193 (02) :303-310
[9]   3-DIMENSIONAL STRUCTURE OF HORSE LIVER ALCOHOL-DEHYDROGENASE AT 2.4 A RESOLUTION [J].
EKLUND, H ;
NORDSTROM, B ;
ZEPPEZAUER, E ;
SODERLUND, G ;
OHLSSON, I ;
BOIWE, T ;
SODERBERG, BO ;
TAPIA, O ;
BRANDEN, CI ;
AKESON, A .
JOURNAL OF MOLECULAR BIOLOGY, 1976, 102 (01) :27-&
[10]  
EKLUND H, 1982, J BIOL CHEM, V257, P4349