title: Detecting protein kinase recognition modes of calmodulin by residual dipolar couplings in solution NMR.
abstract: Calmodulin-regulated serine/threonine kinases (CaM kinases) play crucial roles in Ca2+-dependent signaling transduction pathways in eukaryotes. Despite having a similar overall molecular architecture of catalytic and regulatory domains, CaM kinases employ different binding modes for Ca2+/CaM recruitment which is required for their activation. Here we present a residual dipolar coupling (RDC)-based NMR approach to characterizing the molecular recognition of CaM with five different CaM kinases. Our analyses indicate that CaM kinase I and likely IV use the same CaM binding mode as myosin light chain kinase (1-14 motif), distinct from those of CaM kinase II (1-10 motif) and CaM kinase kinase (1-16- motif). This NMR approach provides an efficient experimental guide for homology modeling and structural characterization of CaM-target complexes.
authors.affiliation: Division of Molecular and Structural Biology, Ontario Cancer Institute, and Department of Medical Biophysics, University of Toronto, Toronto, Ontario M5G 2M9, Canada.
authors.forename: Tapas K
authors.initials: TK
authors.lastname: Mal
authors.forename: Nikolai R
authors.initials: NR
authors.lastname: Skrynnikov
authors.forename: Kyoko L
authors.initials: KL
authors.lastname: Yap
authors.forename: Lewis E
authors.initials: LE
authors.lastname: Kay
authors.forename: Mitsuhiko
authors.initials: M
authors.lastname: Ikura
mesh_terms: D020816:Amino Acid Motifs; D000595:Amino Acid Sequence; D000818:Animals; D054729:Calcium-Calmodulin-Dependent Protein Kinase Type 1; D054734:Calcium-Calmodulin-Dependent Protein Kinase Type 4; D017871:Calcium-Calmodulin-Dependent Protein Kinases / Q000737:chemistry; D002147:Calmodulin / Q000737:chemistry*; D008969:Molecular Sequence Data; D009219:Myosin-Light-Chain Kinase / Q000737:chemistry; D009587:Nitrogen Isotopes; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods*; D011485:Protein Binding; D011487:Protein Conformation; D011494:Protein Kinases / Q000737:chemistry*; D017434:Protein Structure, Tertiary; D011522:Protons; D012996:Solutions; D014982:Xenopus laevis
chemical_list: D002147:Calmodulin; D009587:Nitrogen Isotopes; D011522:Protons; D012996:Solutions; D011494:Protein Kinases; D054729:Calcium-Calmodulin-Dependent Protein Kinase Type 1; D054734:Calcium-Calmodulin-Dependent Protein Kinase Type 4; D017871:Calcium-Calmodulin-Dependent Protein Kinases; D009219:Myosin-Light-Chain Kinase