Allosteric Inhibition of Adenylyl Cyclase Type 5 by G-Protein: A Molecular Dynamics Study

Biomolecules

Juliette Martin¹  Tina-Méryl Amans¹  Elisa Frezza² 

[1] CNRS, UMR 5086 Molecular Microbiology and Structural Biochemistry, University of Lyon, F-69367 Lyon, France;CiTCoM, CNRS, Université de Paris, F-75006 Paris, France;

关键词: molecular dynamics;    flexibility;    protein-protein interactions;    allostery;    enzyme activity;    docking;   

DOI  :  10.3390/biom10091330

来源: DOAJ

【 摘 要 】

Adenylyl cyclases (ACs) have a crucial role in many signal transduction pathways, in particular in the intricate control of cyclic AMP (cAMP) generation from adenosine triphosphate (ATP). Using homology models developed from existing structural data and docking experiments, we have carried out all-atom, microsecond-scale molecular dynamics simulations on the AC5 isoform of adenylyl cyclase bound to the inhibitory G-protein subunit Gαi in the presence and in the absence of ATP. The results show that Gαi has significant effects on the structure and flexibility of adenylyl cyclase, as observed earlier for the binding of ATP and Gsα. New data on Gαi bound to the C1 domain of AC5 help explain how Gαi inhibits enzyme activity and obtain insight on its regulation. Simulations also suggest a crucial role of ATP in the regulation of the stimulation and inhibition of AC5.

【 授权许可】

Unknown