Rogacheva ON, Stefanov VE, Shchegolev BF, Vershinina EA, Savvateeva-Popova EV. Role of arginine 209 in the conformational transition of the protein kinase A regulatory subunit RIα A-domain.
J Bioinform Comput Biol 2014;
12:1441005. [PMID:
24712532 DOI:
10.1142/s0219720014410054]
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Abstract
Using the combination of molecular dynamics (MD) simulations and geometric clustering we analyzed the role of arginine at 209 position in the transition of protein kinase A Iα (PKA Iα) regulatory subunit A-domain from H- to B-conformation and stabilization of the latter. The mechanism underlying the role of the residue at position 209 in the realization of B-conformation includes: (1) possibility to bind the ligand tightly (if transition happens in the presence of cAMP), (2) capability to hold β2β3-loop in the correct conformation, (3) tendency of residue at 209 position to stabilize B-conformation in the absence and in presence of the ligand. In terms of the effect produced on transition of A-domain from H- to B-conformation in the presence of cAMP, mutational substitutions for R209 can be arranged in the following order: Glu(Gly)>Lys>Ile. In the absence of cAMP the order is different Lys>Gly>Glu>Ile. Thus, our results allow us to presume that the role of arginine at 209 position can be important though not crucial.
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