5ok3
From Proteopedia
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Crystal Structure of the Protein-Kinase A catalytic subunit from Criteculus Griseus in complex with compounds RKp241 and Fasudil
Structural highlights
FunctionKAPCA_CRIGR Phosphorylates a large number of substrates in the cytoplasm and the nucleus. Regulates the abundance of compartmentalized pools of its regulatory subunits through phosphorylation of PJA2 which binds and ubiquitinates these subunits, leading to their subsequent proteolysis. Phosphorylates CDC25B, ABL1, NFKB1, CLDN3, PSMC5/RPT6, PJA2, RYR2, RORA and VASP. RORA is activated by phosphorylation. Required for glucose-mediated adipogenic differentiation increase and osteogenic differentiation inhibition from osteoblasts. Involved in the regulation of platelets in response to thrombin and collagen; maintains circulating platelets in a resting state by phosphorylating proteins in numerous platelet inhibitory pathways when in complex with NF-kappa-B (NFKB1 and NFKB2) and I-kappa-B-alpha (NFKBIA), but thrombin and collagen disrupt these complexes and free active PRKACA stimulates platelets and leads to platelet aggregation by phosphorylating VASP. Prevents the antiproliferative and anti-invasive effects of alpha-difluoromethylornithine in breast cancer cells when activated. RYR2 channel activity is potentiated by phosphorylation in presence of luminal Ca(2+), leading to reduced amplitude and increased frequency of store overload-induced Ca(2+) release (SOICR) characterized by an increased rate of Ca(2+) release and propagation velocity of spontaneous Ca(2+) waves, despite reduced wave amplitude and resting cytosolic Ca(2+). PSMC5/RPT6 activation by phosphorylation stimulates proteasome. Negatively regulates tight junctions (TJs) in ovarian cancer cells via CLDN3 phosphorylation. NFKB1 phosphorylation promotes NF-kappa-B p50-p50 DNA binding. Involved in embryonic development by down-regulating the Hedgehog (Hh) signaling pathway that determines embryo pattern formation and morphogenesis. Prevents meiosis resumption in prophase-arrested oocytes via CDC25B inactivation by phosphorylation. May also regulate rapid eye movement (REM) sleep in the pedunculopontine tegmental (PPT) (By similarity). Phosphorylates APOBEC3G and AICDA (By similarity). Publication Abstract from PubMedThe incorporation of diamondoid amino acids (DAAs) into peptide-like drugs is a general strategy to improve lipophilicity, membrane permeability, and metabolic stability of peptidomimetic pharmaceuticals. We designed and synthesized five novel peptidic DAA-containing kinase inhibitors of protein kinase A using a sophisticated molecular dynamics protocol and solid-phase peptide synthesis. By means of a thermophoresis binding assay, NMR, and crystal structure analysis, we determined the influence of the DAAs on the secondary structure and binding affinity in comparison to the native protein kinase inhibitor, which is purely composed of proteinogenic amino acids. Affinity and binding pose are largely conserved. One variant showed 6.5-fold potency improvement, most likely related to its increased side chain lipophilicity. A second variant exhibited slightly decreased affinity presumably due to loss of hydrogen-bond contacts to surrounding water molecules of the first solvation shell. Diamondoid Amino Acid-Based Peptide Kinase A Inhibitor Analogues.,Muller J, Kirschner RA, Berndt JP, Wulsdorf T, Metz A, Hrdina R, Schreiner PR, Geyer A, Klebe G ChemMedChem. 2019 Mar 22;14(6):663-672. doi: 10.1002/cmdc.201800779. Epub 2019, Feb 19. PMID:30677243[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See AlsoReferences
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