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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Kwon, Y. G. Lawrence, D. S. Lee, J. C. Edelman, A. M. |
| Description | Author Affiliation: Lee JC ( Department of Pharmacology and Therapeutics, State University of New York at Buffalo 14214.); |
| Abstract | The substrate recognition determinants of Ca2+/calmodulin-dependent protein kinase Ia were investigated by using peptide analogues based on the amino acid sequence around Ser-9 of synapsin I. The Km and Vmax for the synthetic peptide Leu-Arg-Arg-Arg-Leu-Ser-Asp-Ala-Asn-Phe are 3.9 microM and 18.5 mumol/(min.mg), respectively. Deletion of Leu at the -5 position lowers the Vmax/Km by 470-fold. The requirement for a hydrophobic residue at -5 was confirmed by the 90- to 2400-fold reduction in Vmax/Km produced by Arg, Ala, or Asp substitutions, but only 2.6-fold decrease after Phe substitution at this position. A hydrophobic residue is similarly required at the +4 position. Deletion of Phe at this position produces a 67-fold reduction, and substitution of Ala for Phe a 43-fold reduction in Vmax/Km. In contrast, substitution with Leu increases Vmax/Km by 1.8-fold. Arg at -3 is also required for recognition as shown by an approximately 240-fold decrease in Vmax/Km after Ala substitution at this position. Positions -2, -4, and +1 appear to play secondary roles in substrate recognition. Arg at -2 and -4 are positive determinants, since Ala substitution at these positions decreases Vmax/Km by 4.7- and 11-fold, respectively. Asp at +1 is a negative influence, since Ala and Leu substitutions at this position increase Vmax/Km by 2.3- and 6.3-fold, respectively. Substitution of Ala for Leu at -1 or Thr for Ser at the 0 position has little effect on phosphorylation kinetics. Thus, Ca2+/calmodulin-dependent protein kinase Ia has the minimal substrate recognition motif of Hyd-Xaa-Arg-Xaa-Xaa-(Ser*/Thr*)-Xaa-Xaa-Xaa-Hyd, where Hyd represents a hydrophobic amino acid residue. |
| ISSN | 00278424 |
| e-ISSN | 10916490 |
| Journal | Proceedings of the National Academy of Sciences of the United States of America |
| Issue Number | 14 |
| Volume Number | 91 |
| Language | English |
| Publisher | National Academy of Sciences |
| Publisher Date | 1994-08-01 |
| Publisher Place | United States |
| Access Restriction | Open |
| Subject Keyword | Brain Enzymology Calcium-Calmodulin-Dependent Protein Kinases Metabolism Oligopeptides Synapsins Amino Acid Sequence Amino Acids, Diamino Animals Binding Sites Isolation & Purification Kinetics Molecular Sequence Data Chemical Synthesis Serine Structure-Activity Relationship Substrate Specificity Swine Chemistry Research Support, U.S. Gov't, P.H.S. Multidisciplinary |
| Content Type | Text |
| Resource Type | Article |
| Subject | Multidisciplinary |
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