Dimou M, Zografou C, Venieraki A, Katinakis P. Functional interaction of Azotobacter vinelandii cytoplasmic cyclophilin with the biotin carboxylase subunit of acetyl-CoA carboxylase.
Biochem Biophys Res Commun 2012;
424:736-9. [PMID:
22809506 DOI:
10.1016/j.bbrc.2012.07.021]
[Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2012] [Accepted: 07/08/2012] [Indexed: 10/28/2022]
Abstract
Cyclophilins (E.C. 5.1.2.8) are protein chaperones with peptidyl-prolyl cis/trans isomerase activity (PPIase). In the present study, we demonstrate a physical interaction among AvppiB, encoding the cytoplasmic cyclophilin from the soil nitrogen-fixing bacterium Azotobacter vinelandii, and AvaccC, encoding the biotin carboxylase subunit of acetyl-CoA carboxylase, which catalyzes the committed step in long-chain fatty acid synthesis. A decrease in AvppiB PPIase activity, in the presence of AvaccC, further confirms the interaction. However, PPIase activity seems not to be essential for these interactions since a PPIase active site mutant of cyclophilin does not abolish the AvaccC binding. We further show that the presence of cyclophilin largely influences the measured ATP hydrolyzing activity of AvaccA in a way that is negatively regulated by the PPIase activity. Taken together, our data support a novel role for cyclophilin in regulating biotin carboxylase activity.
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