Publication Date:
1998-09-11
Description:
Signal transduction is controlled both by regulation of enzyme activation and by organization of enzymatic complexes with nonenzymatic adapters, scaffolds, and anchor proteins. The extracellular signal-regulated kinase (ERK) cascade is one of several evolutionarily conserved mitogen-activated protein (MAP) kinase cascades important in the regulation of growth, apoptosis, and differentiation. A two-hybrid screen was conducted to identify nonenzymatic components of this signaling cascade that might be important in regulating its activity. A protein called MP1 (MEK Partner 1) was identified that bound specifically to MEK1 and ERK1 and facilitated their activation. When overexpressed in cultured cells, MP1 enhanced activation of ERK1 and activation of a reporter driven by the transcription factor Elk-1. Expression of MP1 in cells increased binding of ERK1 to MEK1. MP1 apparently functions as an adapter to enhance the efficiency of the MAP kinase cascade.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schaeffer, H J -- Catling, A D -- Eblen, S T -- Collier, L S -- Krauss, A -- Weber, M J -- CA39076/CA/NCI NIH HHS/ -- GM47332/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1998 Sep 11;281(5383):1668-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Cancer Center, University of Virginia Health Sciences Center, Charlottesville, VA 22908, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9733512" target="_blank"〉PubMed〈/a〉
Keywords:
Animals
;
Calcium-Calmodulin-Dependent Protein Kinases/*metabolism
;
Carrier Proteins/*metabolism
;
Cell Line
;
*DNA-Binding Proteins
;
Enzyme Activation
;
MAP Kinase Kinase 1
;
MAP Kinase Kinase 2
;
Mitogen-Activated Protein Kinase 1
;
Mitogen-Activated Protein Kinase 3
;
*Mitogen-Activated Protein Kinase Kinases
;
*Mitogen-Activated Protein Kinases
;
Molecular Sequence Data
;
Phosphorylation
;
Protein-Serine-Threonine Kinases/*metabolism
;
Protein-Tyrosine Kinases/*metabolism
;
Proto-Oncogene Proteins/metabolism
;
Proto-Oncogene Proteins c-raf/metabolism
;
Recombinant Fusion Proteins/metabolism
;
*Signal Transduction
;
*Transcription Factors
;
Transcriptional Activation
;
Transfection
;
ets-Domain Protein Elk-1
Print ISSN:
0036-8075
Electronic ISSN:
1095-9203
Topics:
Biology
,
Chemistry and Pharmacology
,
Computer Science
,
Medicine
,
Natural Sciences in General
,
Physics
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