MAMMALIAN ALPHA-KETO ACID DEHYDROGENASE COMPLEXES - GENE-REGULATION AND GENETIC-DEFECTS

被引:71
作者
PATEL, MS [1 ]
HARRIS, RA [1 ]
机构
[1] INDIANA UNIV,SCH MED,DEPT BIOCHEM & MOLEC BIOL,INDIANAPOLIS,IN 46202
关键词
PYRUVATE DEHYDROGENASE COMPLEX; BRANCHED-CHAIN ALPHA-KETO; ACID DEHYDROGENASE COMPLEX; GENE ORGANIZATION; GENETIC DEFECTS;
D O I
10.1096/fasebj.9.12.7672509
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
Recent application of the tools of molecular biology has provided insight with respect to the structure, regulation, and defects of the genes encoding the PDC and the BCKADC, cDNAs for the alpha-KGDC have only recently been cloned. Evidence for long-term regulation of the expression of the subunits of the PDC and the BCKADC has been obtained. Detailed analyses of the promoter-regulatory regions of the genes encoding the individual subunits of these complexes have provided leads as to molecular mechanisms involved. Evidence for coordinated regulation of expression of the subunits of the complexes has been obtained under some conditions but not others. Except for the PDC E1 alpha(X) promoter, the other promoters of the genes encoding PDC and BCKADC components are TATA-less with characteristics of housekeeping genes. Most cases of PDC deficiency, which produces lactic acidosis, are caused by defects in the coding region of the E1 alpha subunit. In contrast, gene defects that cause maple syrup urine disease are more heterogeneous, involving errors in any one of the subunits of the BCKADC, alpha-KGDC deficiency has been reported but specific mutations have not been identified. Future work is expected to include detailed studies of the genes encoding the protein kinases and phosphatases that specifically regulate the PDC and the BCKADC by covalent modification.
引用
收藏
页码:1164 / 1172
页数:9
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