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Definition of a consensus sequence for peptide substrate recognition by p44mpk, the meiosis-activated myelin basic protein kinase
Open accessAbstract
Synthetic peptides have been used to define the consensus amino acid sequence for substrate recognition by the meiosis-activated myelin basic protein (MBP) kinase (p44mpk), which was purified from maturing sea star oocytes. This protein kinase shares many properties with the mitogen-activated microtubule-associated protein-2 kinase (p42mapk) in vertebrates. Recently, Thr-97 in the tryptic fragment KNIVTPRTPPPSQGK of bovine MBP was identified as the major site of phosphorylation by p44mpk (Sanghera, J. S., Aebersold, R., Morrison, H. D., Bures, E. J., and Pelech, S. L. (1990) FEBS Lett. 273, 223-226). Synthetic peptides modeled after this sequence revealed that the presence of a proline residue C-terminal (+1 position) to the phosphorylatable threonine (or serine) residue was critical for recognition by p44mpk. Although not essential, a proline residue located at the -2 position enhanced the Vmax of peptide phosphorylation. Basic, acidic, and non-polar residues were equally tolerated at the -1 position. The presence of an amino acid residue at position -3 also increased peptide phosphorylation. Thus, the optimum consensus sequence for phosphorylation by p44mpk was defined as Pro-X-(Ser/Thr)-Pro, where X is a variable amino acid residue, but ideally not a Pro. Peptides that included this sequence were phosphorylated by p44mpk with Vmax values approaching 1 mumol.min-1.mg-1 and with apparent Km values of approximately 1 mM). Pseudosubstrate peptides in which the phosphorylatable residue was replaced by valine or alanine were weak inhibitors of p44mpk (apparent Ki values of approximately 3 mM). Over 40 distinct protein kinases contain Pro-X-(Ser/Thr)-Pro sequences including the human receptors for insulin and epidermal growth factor, and kinases encoded by the human proto-oncogenes abl, neu, and raf-1, and Schizosaccharomyces pombe cell cycle control genes ran-1 and wee-1. Multiple putative sites were also identified in rat microtubule-associated protein-2, human retinoblastoma protein, human tau protein, and Drosophila myb protein and RNA polymerase II.
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Metadata
- Authors
- Clark-Lewis, I., Sanghera, J. S., & Pelech, S. L.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 1991-08
- Volume
- 266
- Issue
- 23
- Pages
- 15180-15184
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W1543158853
- Cited by
- 400
- References
- 0
- FWCI
- 15.09
- Type
- journal article
- Language
- en
- Open access
- hybrid
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