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. 1985 May;82(10):3086–3090. doi: 10.1073/pnas.82.10.3086

Catalytic unit of adenlyate cyclase: purification and identification by affinity crosslinking.

E Pfeuffer, R M Dreher, H Metzger, T Pfeuffer
PMCID: PMC397719  PMID: 3923471

Abstract

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.

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Selected References

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