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STRUCTURE OF PKA-PKB CHIMERA COMPLEXED WITH A-443654STRUCTURE OF PKA-PKB CHIMERA COMPLEXED WITH A-443654
Structural highlights
Function[IPKA_HUMAN] Extremely potent competitive inhibitor of cAMP-dependent protein kinase activity, this protein interacts with the catalytic subunit of the enzyme after the cAMP-induced dissociation of its regulatory chains. Evolutionary Conservation![]() Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf. Publication Abstract from PubMedAlthough the crystal structure of the anti-cancer target protein kinase B (PKBbeta/Akt-2) has been useful in guiding inhibitor design, the closely related kinase PKA has generally been used as a structural mimic due to its facile crystallization with a range of ligands. The use of PKB-inhibitor crystallography would bring important benefits, including a more rigorous understanding of factors dictating PKA/PKB selectivity, and the opportunity to validate the utility of PKA-based surrogates. We present a "back-soaking" method for obtaining PKBbeta-ligand crystal structures, and provide a structural comparison of inhibitor binding to PKB, PKA, and PKA-PKB chimera. One inhibitor presented here exhibits no PKB/PKA selectivity, and the compound adopts a similar binding mode in all three systems. By contrast, the PKB-selective inhibitor A-443654 adopts a conformation in PKB and PKA-PKB that differs from that with PKA. We provide a structural explanation for this difference, and highlight the ability of PKA-PKB to mimic the true PKB binding mode in this case. A structural comparison of inhibitor binding to PKB, PKA and PKA-PKB chimera.,Davies TG, Verdonk ML, Graham B, Saalau-Bethell S, Hamlett CC, McHardy T, Collins I, Garrett MD, Workman P, Woodhead SJ, Jhoti H, Barford D J Mol Biol. 2007 Mar 30;367(3):882-94. Epub 2007 Jan 9. PMID:17275837[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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OCA- Bovin
- CAMP-dependent protein kinase
- Barford, D
- Collins, I
- Davies, T G
- Garrett, M D
- Graham, B
- Hamlett, C C.F
- Jhoti, H
- Mchardy, T
- Saalau-Bethell, S
- Verdonk, M L
- Woodhead, S J
- Workman, P
- Atp-binding
- Camp
- Kinase
- Lipoprotein
- Myristate
- Nuclear protein
- Nucleotide-binding
- Phosphorylation
- Protein kinase inhibitor
- Serine/threonine-protein kinase
- Transferase