Abstract：
:The goal of this study was to establish conditions for solubilization and characterization of CPTo, the malonyl-CoA sensitive form of mitochondrial carnitine palmitoyltransferase. CPTo of heart mitochondria is soluble in 1% octyl glucoside with retention of malonyl-CoA sensitivity. The degree of malonyl-CoA sensitivity is dependent on both the concentration of octyl glucoside and the presence of salt (KCl). In mannitol-sucrose, 0.5-1% octyl glucoside solubilizes CPTo without loss of malonyl-CoA sensitivity; however, either increasing the detergent concentration or addition of KCl promotes loss of malonyl-CoA sensitivity. The immunoglobulin fraction from immune serum obtained from rabbits immunized with the malonyl-CoA-insensitive form of CPT (CPTi) purified from beef heart mitochondria was used for preparation of an affinity column. The antibody column retained both malonyl-CoA-sensitive and -insensitive CPT activity without apparent selectivity. In addition to CPT, several other major protein bands were detected when the antibody column eluates were subjected to SDS-PAGE; however, native gel electrophoresis gives a large, high molecular weight, diffuse band. After elution of the antibody-CPT column with salt, a 68,000-Da protein is retained by the column. The retained protein contains the CPT activity, but it is not inhibited by malonyl-CoA. Thus, salt elution separates catalysis from inhibition. When the salt eluate is subjected to affinity chromatography using agarose-CoA, two protein peaks are obtained; both bind malonyl-CoA. One of the two fractions contains beta-hydroxyacyl-CoA dehydrogenase, beta-ketothiolase, and crotonase activity. These data show that octyl glucoside solubilized CPTo and CPTi are associated with a complex that contains beta-oxidation enzymes.
journal_name
Biochemistryjournal_title
Biochemistryauthors
Kerner J,Bieber Ldoi
10.1021/bi00470a010subject
Has Abstractpub_date
1990-05-08 00:00:00pages
4326-34issue
18eissn
0006-2960issn
1520-4995journal_volume
29pub_type
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