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Title: KRAS interaction with RAF1 RAS-binding domain and cysteine-rich domain provides insights into RAS-mediated RAF activation

Journal Article · · Nature Communications

The first step of RAF activation involves binding to active RAS, resulting in the recruitment of RAF to the plasma membrane. To understand the molecular details of RAS-RAF interaction, we present crystal structures of wild-type and oncogenic mutants of KRAS complexed with the RAS-binding domain (RBD) and the membrane-interacting cysteine-rich domain (CRD) from the N-terminal regulatory region of RAF1. Our structures reveal that RBD and CRD interact with each other to form one structural entity in which both RBD and CRD interact extensively with KRAS. Mutations at the KRAS-CRD interface result in a significant reduction in RAF1 activation despite only a modest decrease in binding affinity. Combining our structures and published data, we provide a model of RAS-RAF complexation at the membrane, and molecular insights into RAS-RAF interaction during the process of RAS-mediated RAF activation.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
National Institutes of Health (NIH); National Institute of General Medical Sciences (NIGMS); Office of Research Infrastructure Programs (ORIP); USDOE Office of Science (SC); National Cancer Institute (NCI)
Grant/Contract Number:
AC02-06CH11357; HHSN261200800001E; P30 GM124165; S10OD021527; 89233218CNA000001
OSTI ID:
1767216
Alternate ID(s):
OSTI ID: 1804340
Report Number(s):
LA-UR-20-24476; APS_261366
Journal Information:
Nature Communications, Vol. 12, Issue 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
ENGLISH

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