Gene/Protein Disease Symptom Drug Enzyme Compound
Pivot Concepts:   Target Concepts:
Query: EC:2.7.11.25 (MEKK1)
 1,856 document(s) hit in 31,850,051 MEDLINE articles (0.00 seconds)

The 14-3-3 proteins are small abundant cytosolic eukaryotic proteins that associate with and modulate the activity of numerous other proteins. The 14-3-3 beta isoform has been shown to bind to the product of the protooncogene cRaf-1 and to facilitate its activation by Ras. Using the yeast two-hybrid system, we have demonstrated that 14-3-3 beta and another isoform, 14-3-3 tau, bind to the product of the primary response gene BRF1 and that the interaction between each isoform and BRF1 is significantly stronger than that with cRaf-1. We further demonstrated that the charge of residue 187 in 14-3-3 beta regulates its affinity for both BRF1 and cRaf-1. The interaction of either isoform with BRF1 requires both proteins to be fully intact. When all three proteins are coexpressed in a yeast trihybrid system, BRF1 interferes significantly with the binding of 14-3-3 to full-length cRaf-1 as well as to its regulatory and kinase domains. Using quantitative reverse transcription-polymerase chain reaction, 14-3-3 beta and BRF1 were found to be coexpressed in four different human tissues, suggesting a biologic role for their interaction in the regulation of cRaf-1-mediated signal transduction processes.
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PMID:The product of the primary response gene BRF1 inhibits the interaction between 14-3-3 proteins and cRaf-1 in the yeast trihybrid system. 1046 61