期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1985
卷号：82
期号：10
页码：3086-3090
DOI：10.1073/pnas.82.10.3086
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：The guanosine 5'-[beta, gamma-imido]triphosphate (p[NH]ppG)-activated adenylate cyclase from rabbit myocardial membranes was purified approximately equal to 60,000-fold to a specific activity of 15 mumol X mg-1 X min-1 by Lubrol PX extraction, affinity chromatography, and gel permeation HPLC. The major purification (greater than 2000-fold) was achieved by affinity chromatography on forskolin-Sepharose, a method previously developed in this laboratory. The final product appeared as two major peptides of Mr 150,000 and 42,000 and one minor peptide of Mr 45,000 when analyzed by NaDodSO4/polyacrylamide gel electrophoresis. It is suggested that the Mr 42,000 and 150,000 components represent the alpha-subunit of the stimulatory guanine nucleotide binding regulatory protein (GS) and the catalytic unit, respectively, because upon crosslinking of a reconstituted adenylate cyclase containing the [32P]ADP-ribosylated alpha-subunit of GS (Mr, 42,000), a single radiolabeled product of Mr 190,000 appeared on NaDodSO4/polyacrylamide gels. Further identification is based on the correlation of the Mr 150,000/42,000 bands with enzymatic activity when the purified enzyme was analyzed by various chromatographic procedures.
