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Regulation of RAF family kinases: new insights from recent structural and biochemical studies.
Biochemical Society Transactions 2024 May 3
The RAF kinases are required for signal transduction through the RAS-RAF-MEK-ERK pathway, and their activity is frequently up-regulated in human cancer and the RASopathy developmental syndromes. Due to their complex activation process, developing drugs that effectively target RAF function has been a challenging endeavor, highlighting the need for a more detailed understanding of RAF regulation. This review will focus on recent structural and biochemical studies that have provided 'snapshots' into the RAF regulatory cycle, revealing structures of the autoinhibited BRAF monomer, active BRAF and CRAF homodimers, as well as HSP90/CDC37 chaperone complexes containing CRAF or BRAFV600E. In addition, we will describe the insights obtained regarding how BRAF transitions between its regulatory states and examine the roles that various BRAF domains and 14-3-3 dimers play in both maintaining BRAF as an autoinhibited monomer and in facilitating its transition to an active dimer. We will also address the function of the HSP90/CDC37 chaperone complex in stabilizing the protein levels of CRAF and certain oncogenic BRAF mutants, and in serving as a platform for RAF dephosphorylation mediated by the PP5 protein phosphatase. Finally, we will discuss the regulatory differences observed between BRAF and CRAF and how these differences impact the function of BRAF and CRAF as drivers of human disease.
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