3PVB
Crystal structure of (73-244)RIa:C holoenzyme of cAMP-dependent Protein kinase
Summary for 3PVB
Entry DOI | 10.2210/pdb3pvb/pdb |
Related | 1RGS 2QCS |
Descriptor | cAMP-dependent protein kinase catalytic subunit alpha, cAMP-dependent protein kinase type I-alpha regulatory subunit, PHOSPHOAMINOPHOSPHONIC ACID-ADENYLATE ESTER, ... (6 entities in total) |
Functional Keywords | kinase, ria holoenzyme, tetrameric protein kinase a, transferase |
Biological source | Mus musculus (mouse) More |
Cellular location | Cytoplasm: P05132 Cell membrane (By similarity): P00514 |
Total number of polymer chains | 2 |
Total formula weight | 59050.33 |
Authors | Boettcher, A.J.,Wu, J.,Kim, C.,Yang, J.,Bruystens, J.,Cheung, N.,Pennypacker, J.K.,Blumenthal, D.A.,Kornev, A.P.,Taylor, S.S. (deposition date: 2010-12-06, release date: 2011-02-02, Last modification date: 2024-11-20) |
Primary citation | Boettcher, A.J.,Wu, J.,Kim, C.,Yang, J.,Bruystens, J.,Cheung, N.,Pennypacker, J.K.,Blumenthal, D.A.,Kornev, A.P.,Taylor, S.S. Crystal structure of (73-244)RIa:C holoenzyme of cAMP-dependent Protein kinase Structure, 19:265-276, 2011 Cited by PubMed Abstract: PKA holoenzymes containing two catalytic (C) subunits and a regulatory (R) subunit dimer are activated cooperatively by cAMP. While cooperativity involves the two tandem cAMP binding domains in each R-subunit, additional cooperativity is associated with the tetramer. Of critical importance is the flexible linker in R that contains an inhibitor site (IS). While the IS becomes ordered in the R:C heterodimer, the overall conformation of the tetramer is mediated largely by the N-Linker that connects the D/D domain to the IS. To understand how the N-Linker contributes to assembly of tetrameric holoenzymes, we engineered a monomeric RIα that contains most of the N-Linker, RIα(73-244), and crystallized a holoenzyme complex. Part of the N-linker is now ordered by interactions with a symmetry-related dimer. This complex of two symmetry-related dimers forms a tetramer that reveals novel mechanisms for allosteric regulation and has many features associated with full-length holoenzyme. A model of the tetrameric holoenzyme, based on this structure, is consistent with previous small angle X-ray and neutron scattering data, and is validated with new SAXS data and with an RIα mutation localized to a novel interface unique to the tetramer. PubMed: 21300294DOI: 10.1016/j.str.2010.12.005 PDB entries with the same primary citation |
Experimental method | X-RAY DIFFRACTION (3.3 Å) |
Structure validation
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