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Science 335 (6069): 712-716

Copyright © 2012 by the American Association for the Advancement of Science

Structure and Allostery of the PKA RIIβ Tetrameric Holoenzyme

Ping Zhang,1 Eric V. Smith-Nguyen,2 Malik M. Keshwani,1,3 Michael S. Deal,2 Alexandr P. Kornev,2,3 Susan S. Taylor1,2,3,*

Abstract: In its physiological state, cyclic adenosine monophosphate (cAMP)–dependent protein kinase (PKA) is a tetramer that contains a regulatory (R) subunit dimer and two catalytic (C) subunits. We describe here the 2.3 angstrom structure of full-length tetrameric RIIβ2:C2 holoenzyme. This structure showing a dimer of dimers provides a mechanistic understanding of allosteric activation by cAMP. The heterodimers are anchored together by an interface created by the β4-β5 loop in the RIIβ subunit, which docks onto the carboxyl-terminal tail of the adjacent C subunit, thereby forcing the C subunit into a fully closed conformation in the absence of nucleotide. Diffusion of magnesium adenosine triphosphate (ATP) into these crystals trapped not ATP, but the reaction products, adenosine diphosphate and the phosphorylated RIIβ subunit. This complex has implications for the dissociation-reassociation cycling of PKA. The quaternary structure of the RIIβ tetramer differs appreciably from our model of the RIα tetramer, confirming the small-angle x-ray scattering prediction that the structures of each PKA tetramer are different.

1 Howard Hughes Medical Institute, University of California, San Diego, La Jolla, CA 92093–0654, USA.
2 Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093–0654, USA.
3 Department of Pharmacology, University of California, San Diego, La Jolla, CA 92093–0654, USA.

* To whom correspondence should be addressed. E-mail: staylor{at}ucsd.edu


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