Human RAF1/CRAF (UniProt P04049): Functional Annotation Research Report Falcon Edison Scientific Literature 42 citations 1 artifacts 2026-09-27T00:03:38.328018

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Human RAF1/CRAF (UniProt P04049): Functional Annotation Research Report

Executive summary

Identity is verified. The requested protein is human RAF1 (HGNC:9829; UniProt P04049), also called CRAF, c-Raf, or Raf-1—not BRAF, ARAF, or a similarly named protein from another organism. It is a ubiquitously expressed, approximately 75-kDa RAF-family serine/threonine kinase and a direct effector of activated RAS. Its domain architecture and kinase-family assignment agree with the supplied UniProt record. (riaud2024theroleof pages 1-2, spencersmith2024regulationofraf pages 1-3)

RAF1’s best-established catalytic function is to phosphorylate the activation loops of MEK1/MAP2K1 and MEK2/MAP2K2, thereby initiating the MEK–ERK arm of mitogen-activated protein kinase signaling. These remain the only broadly accepted physiological RAF1 substrates; many reported alternatives have substantially weaker validation. RAF1 also has important noncatalytic functions as a dimerization partner and signaling scaffold, particularly in apoptosis control and some KRAS-driven cancers. (matallanas2011raffamilykinases pages 8-9, roskoski2010rafproteinserinethreoninekinases pages 2-3, bahar2023targetingtherasrafmapk pages 9-10)

Aspect Best-supported annotation Evidence strength/caveat
Identity Human RAF1 encodes CRAF (also RAF-1/c-Raf), a ubiquitously expressed ~75-kDa RAF-family serine/threonine protein kinase corresponding to UniProt P04049. (riaud2024theroleof pages 1-2, spencersmith2024regulationofraf pages 1-3) High confidence. Nomenclature, organism, kinase class, and supplied UniProt identity are concordant; this is not BRAF, ARAF, or a similarly named non-human gene.
Domain architecture The N-terminal regulatory region comprises CR1—the RAS-binding domain (RBD) and cysteine-rich domain (CRD/C1-like phospholipid-binding module)—and serine/threonine-rich CR2, which contains the inhibitory pSer259 14-3-3 site. C-terminal CR3 contains the protein-kinase domain and pSer621 14-3-3 site. (wang2023targetingcrafkinase pages 1-2, riaud2024theroleof pages 1-2, scardaci2024novelraf‐directedapproaches pages 1-2) High confidence. This architecture agrees with classification in the protein-kinase superfamily and the TKL Ser/Thr branch; the CRD explains the supplied C1-like/DAG–phorbol-ester-binding InterPro annotations, although RAF1 is not conventionally defined as a DAG-activated kinase.
Catalytic reaction RAF1 transfers the γ-phosphate of MgATP to serine residues in protein substrates: ATP + protein-L-serine → ADP + protein-O-phospho-L-serine. Its canonical reaction activates MEK1/2 through dual activation-loop phosphorylation. (matallanas2011raffamilykinases pages 8-9, roskoski2010rafproteinserinethreoninekinases pages 2-3) High confidence for protein-serine phosphorylation. Exact activation-loop numbering is isoform-specific; commonly cited sites are MEK1 Ser218/Ser222 and MEK2 Ser222/Ser226.
Direct substrates MEK1/MAP2K1 and MEK2/MAP2K2 are the only broadly accepted physiological RAF1 substrates. RAF kinases have unusually restricted substrate specificity, and CRAF generally has lower intrinsic MEK-kinase activity than BRAF. (matallanas2011raffamilykinases pages 8-9, roskoski2010rafproteinserinethreoninekinases pages 2-3, bahar2023targetingtherasrafmapk pages 6-7) High confidence for MEK1/2. BAD, adenylyl cyclases, RB, MYPT and other reported targets lack equally broad physiological validation; BAD should not be presented as equivalent in certainty to MEK1/2. (matallanas2011raffamilykinases pages 8-9, bahar2023targetingtherasrafmapk pages 9-10, riaud2024theroleof pages 5-6)
Activation mechanism Inactive RAF1 is a closed, cytosolic monomer stabilized by intramolecular CRD–kinase contacts and 14-3-3 binding to pSer259/pSer621. GTP-loaded RAS recruits it through the RBD and CRD to phosphatidylserine-rich plasma membrane; MRAS–SHOC2–PP1C promotes Ser259 dephosphorylation, regulatory phosphorylation and conformational opening permit RAF homo/heterodimerization, and the active dimer phosphorylates MEK. HSP90–CDC37 supports RAF1 folding and stability. (spencersmith2024regulationofraf pages 6-7, riaud2024theroleof pages 1-2, spencersmith2024regulationofraf pages 1-3) High confidence for the overall cycle. Individual phosphorylation events are context-dependent, and structural details have historically been inferred partly from BRAF; recent biochemical/structural studies support both shared RAF regulation and CRAF-specific differences.
Canonical localization RAF1 is predominantly an inactive cytosolic complex at baseline and is recruited transiently to the cytoplasmic face of the plasma membrane by RAS-GTP, where dimerization, MEK phosphorylation, and canonical MAPK signaling occur. (riaud2024theroleof pages 1-2, bahar2023targetingtherasrafmapk pages 5-6, jeon2024signalingfromras pages 18-20) High confidence. Membrane residence is stimulus-dependent rather than constitutive; evidence in the cited EGF context argues against internalized EGFR endosomes as the principal signaling site.
Noncanonical localization A context-specific RAF1 pool translocates to the mitochondrial surface, promoted in some systems by PAK-mediated Ser338/Ser339 phosphorylation or BCL-2 binding, and participates in anti-apoptotic signaling. (riaud2024theroleof pages 5-6, wang2023targetingcrafkinase pages 14-15) Moderate confidence and context-dependent. Mitochondrial BAD phosphorylation has been reported, but BAD is a proposed/contextual substrate, not as firmly established as MEK1/2. Endosomal, Golgi, and nuclear RAF1 should not be treated as universal canonical localizations from current evidence.
Kinase-independent roles RAF1 can function as a scaffold that suppresses apoptosis by binding/inhibiting ASK1 and MST2 and can support proliferation, migration, and KRAS-driven tumor maintenance through dimerization or protein interactions even when catalytic activity is dispensable. (riaud2024theroleof pages 5-6, bahar2023targetingtherasrafmapk pages 9-10, wang2023targetingcrafkinase pages 15-16) Moderate-to-high confidence, strongest in genetic and cancer-model studies. The relative contribution of catalytic versus scaffold activity varies by tissue, oncogenic driver, and experimental system.
Germline disease Heterozygous germline RAF1 variants cause RASopathies, especially Noonan syndrome 5 and Noonan syndrome with multiple lentigines, often with hypertrophic cardiomyopathy. Variants near the N-terminal 14-3-3 site can weaken autoinhibition; both activating variants such as G361A and catalytically impaired, dimer-activating variants such as D486N are documented. (OpenTargets Search: -RAF1, spencersmith2024regulationofraf pages 6-7, riaud2024theroleof pages 9-10) High-confidence gene–disease association. Pathogenic mechanisms are allele-specific and cannot be reduced to simple gain of intrinsic kinase activity.
Somatic cancer RAF1 is altered by activating mutations, amplification, fusions, overexpression, and adaptive activation. Reported mutation estimates vary from ~0.7% to 2.3% pan-cancer; examples include 5.41% in cutaneous melanoma and amplification in 10.71% of one TCGA bladder-cancer cohort. RAF1 fusions occur in up to 18.5% of pancreatic acinar-cell carcinomas but are much rarer in many common cancers. (wang2023targetingcrafkinase pages 14-15, riaud2024theroleof pages 6-7, wang2023targetingcrafkinase pages 15-16, riaud2024theroleof pages 7-8) Moderate-to-high confidence, but frequencies depend strongly on cohort, assay, and alteration definition. RAF1 is less commonly mutated than BRAF and is often activated downstream of mutant RAS without alteration of RAF1 itself.
Therapeutic status No selective RAF1/CRAF inhibitor is approved. Approved BRAF-directed drugs are not RAF1-selective and can induce paradoxical ERK activation in RAS-active/BRAF-wild-type cells through RAF dimers. Type-II pan-RAF or RAF-dimer strategies—including belvarafenib, lifirafenib, naporafenib, tovorafenib and related agents—and pan-RAF–MEK combinations remain investigational. (wang2023targetingcrafkinase pages 21-23, riaud2024theroleof pages 11-12, scardaci2024novelraf‐directedapproaches pages 2-3, wang2023targetingcrafkinase pages 1-2) Clinical validation remains incomplete. Published early-trial response rates vary widely by agent and biomarker (0–64% in studies summarized in 2024), and inhibiting catalytic activity may not eliminate kinase-independent RAF1 functions; selective RAF1 degradation is therefore an attractive but still preclinical strategy. (riaud2024theroleof pages 11-12, riaud2024theroleof pages 10-11)

Table: Concise evidence-based annotation of human RAF1/CRAF (UniProt P04049), separating established catalytic and localization functions from contextual or emerging findings. The table also distinguishes validated disease associations from investigational therapeutic strategies.

1. Target verification and molecular organization

1.1 Identity

The literature consistently identifies RAF1 as encoding CRAF/RAF-1, one of the three mammalian RAF paralogues together with ARAF and BRAF. The descriptions—human protein, RAF-family kinase, RAS effector, and approximately 75-kDa serine/threonine kinase—match UniProt P04049. No evidence was used from a different RAF-like gene or organism. (riaud2024theroleof pages 1-2, scardaci2024novelraf‐directedapproaches pages 1-2, spencersmith2024regulationofraf pages 1-3)

1.2 Domains

RAF1 has three conserved regions:

This organization agrees with the supplied InterPro assignments for a C1-like/DAG–phorbol-ester-binding fold and a protein-kinase domain. The C1-like annotation should not, however, be interpreted to mean that RAF1 is regulated like a conventional DAG-activated protein kinase C; in RAF1, the CRD principally supports RAS, phospholipid, and intramolecular regulatory interactions. (wang2023targetingcrafkinase pages 1-2, spencersmith2024regulationofraf pages 6-7)

2. Primary biochemical function

2.1 Catalytic reaction

RAF1 is an ATP-dependent protein-serine kinase (EC 2.7.11.1):

ATP + protein-L-serine → ADP + protein-O-phospho-L-serine.

The catalytic domain uses MgATP to transfer the γ-phosphate of ATP to substrate serine hydroxyl groups. RAF kinases have unusually restricted physiological substrate specificity. (matallanas2011raffamilykinases pages 8-9, roskoski2010rafproteinserinethreoninekinases pages 2-3)

2.2 Substrate specificity

The strongest consensus is that MEK1 and MEK2 are RAF1’s bona fide physiological substrates. RAF phosphorylation of two activation-loop serines activates MEK, after which MEK—being a dual-specificity kinase—phosphorylates ERK1/2. Canonical site assignments are MEK1 Ser218/Ser222 and MEK2 Ser222/Ser226, although some older sources use alternative numbering conventions; the robust annotation is therefore dual activation-loop serine phosphorylation rather than dependence on one numbering system. (matallanas2011raffamilykinases pages 8-9, roskoski2010rafproteinserinethreoninekinases pages 2-3, bahar2023targetingtherasrafmapk pages 6-7)

All three RAF proteins can bind and phosphorylate MEK in vitro, but BRAF generally has much higher intrinsic MEK-kinase activity than CRAF. RAF1 should consequently be annotated as a regulated MEK kinase and signaling/dimerization component, not as a broadly promiscuous serine kinase. (matallanas2011raffamilykinases pages 8-9, maurer2011rafkinasesin pages 1-2)

Reported non-MEK targets include BAD, adenylyl cyclases, RB, MYPT and cardiac troponin T. Their physiological validation is not equivalent to that of MEK1/2. In particular, mitochondrial BAD phosphorylation has experimental support in selected systems, but reviews also describe BAD, ASK1 and MST2 as apoptosis-related RAF1 effectors without consistently establishing direct phosphotransfer; ASK1 and MST2 inhibition is often interaction- or scaffold-mediated. (matallanas2011raffamilykinases pages 8-9, bahar2023targetingtherasrafmapk pages 9-10, riaud2024theroleof pages 5-6)

3. Regulatory cycle and pathway position

3.1 Basal autoinhibition

In unstimulated cells, RAF1 is principally a closed, inactive cytosolic monomer. Intramolecular contacts between its regulatory and kinase regions, inhibitory phosphorylation, and a 14-3-3 dimer spanning the N- and C-terminal phosphoserine sites stabilize this state. Ser259 is particularly important for N-terminal 14-3-3 engagement. RAF1 also depends strongly on the HSP90–CDC37 chaperone system for folding and protein stability. (spencersmith2024regulationofraf pages 6-7, riaud2024theroleof pages 1-2, spencersmith2024regulationofraf pages 1-3)

3.2 RAS-dependent activation

Growth-factor receptor signaling loads RAS with GTP. RAS-GTP recruits RAF1 to the inner plasma membrane through the RBD, while the CRD contacts RAS and phosphatidylserine-rich membrane surfaces. These interactions orient RAF1 and promote release of autoinhibition rather than merely increasing bulk RAS affinity. (spencersmith2024regulationofraf pages 6-7, riaud2024theroleof pages 1-2)

The MRAS–SHOC2–PP1C phosphatase complex facilitates dephosphorylation of inhibitory Ser259. Rearrangement of 14-3-3, phosphorylation of activating regulatory sites, kinase-domain conformational changes, and formation of RAF1–RAF1 or RAF1–BRAF/ARAF dimers then produce the active state. The active RAF complex phosphorylates MEK1/2, which activate ERK1/2 and downstream cytoplasmic and nuclear responses. (riaud2024theroleof pages 1-2, spencersmith2024regulationofraf pages 1-3)

RAF1 is subsequently constrained by ERK-dependent feedback, inhibitory phosphorylation, phosphatases and complex disassembly. Ser642 is one reported ERK-feedback site; Ser621 supports 14-3-3 binding and RAF1 stability/MEK-kinase competence. The effects of individual sites remain context-dependent rather than constituting a simple linear activation code. (riaud2024theroleof pages 5-6)

3.3 Biological pathway

The canonical sequence is:

RTK → RAS-GTP → RAF1-containing RAF dimer → MEK1/2 → ERK1/2 → changes in proliferation, differentiation, survival, migration and metabolism.

RAF1 is therefore a signaling relay between membrane-associated RAS and the core MAPK kinase module. It is not the kinase that directly phosphorylates ERK; MEK performs that reaction. (riaud2024theroleof pages 1-2, bahar2023targetingtherasrafmapk pages 6-7)

4. Subcellular localization

Canonical location

Basal RAF1 is predominantly cytosolic. Following RAS activation, it is transiently recruited to the cytoplasmic face of the plasma membrane, the principal compartment in which canonical RAF dimerization and MEK activation occur. Forced membrane retention can generate constitutive, partly RAS-independent signaling, underscoring the functional importance of localization. Recent live-cell analyses support signaling from plasma-membrane-associated RAS–RAF assemblies rather than internalized EGF-receptor endosomes in the examined setting. (bahar2023targetingtherasrafmapk pages 5-6, jeon2024signalingfromras pages 18-20, berlinska2025unravellingkrasbiology pages 10-13)

Context-specific mitochondrial location

A distinct RAF1 pool can translocate to mitochondria following PAK-dependent Ser338/Ser339 phosphorylation or interaction with BCL-2. At mitochondria, RAF1 participates in anti-apoptotic signaling, including reported BAD inactivation and binding-mediated suppression of ASK1/MST2 pathways. This localization is stimulus- and cell-context-dependent and should not replace the plasma membrane as RAF1’s primary canonical signaling site. (riaud2024theroleof pages 5-6, wang2023targetingcrafkinase pages 14-15)

Evidence retrieved here does not justify treating nuclear, Golgi or endosomal RAF1 as universal functional locations. Observations involving engineered CAAX-tagged RAF constructs suggest possible ER/Golgi trafficking but do not establish a canonical endogenous human RAF1 compartment. (berlinska2025unravellingkrasbiology pages 58-60, berlinska2025unravellingkrasbiology pages 44-48)

5. Kinase-independent functions

RAF1’s protein scaffold can be biologically important independently of phosphotransfer. Documented functions include binding and inhibition of the pro-apoptotic kinases ASK1 and MST2, organization of RAF dimers, and support of proliferation or survival in KRAS-driven tumor models even when RAF1 catalytic activity is dispensable. In some models, deleting RAF1 produces a stronger phenotype than rendering its kinase inactive, indicating that protein abundance and interaction surfaces—not simply ATP-site activity—are the relevant dependency. (riaud2024theroleof pages 5-6, bahar2023targetingtherasrafmapk pages 9-10, wang2023targetingcrafkinase pages 15-16)

This dual catalytic/scaffold character explains why selective inhibition of RAF1 kinase activity has produced inconsistent results and why degradation or disruption of specific RAF1 protein interactions is being considered. It also cautions against using reduced ERK phosphorylation as the sole measure of RAF1 biological inhibition. (riaud2024theroleof pages 16-16, wang2023targetingcrafkinase pages 1-2)

6. Human disease relevance

6.1 Germline disorders

Pathogenic germline RAF1 variants cause RASopathies, particularly Noonan syndrome 5, Noonan syndrome, and Noonan syndrome with multiple lentigines/LEOPARD syndrome 2; disease databases also associate RAF1 with cardiomyopathy. (OpenTargets Search: -RAF1)

Many pathogenic variants cluster near regulatory regions, including the N-terminal 14-3-3 site, and weaken autoinhibition. However, RAF1 RASopathy mechanisms are allele-specific: G361A is a high-activity mutant, whereas D486N is catalytically impaired yet can enhance MEK–ERK signaling through BRAF heterodimerization. RAF1-associated Noonan syndrome has a notable association with hypertrophic cardiomyopathy, so variants should not be interpreted solely from intrinsic kinase activity. (spencersmith2024regulationofraf pages 6-7, wang2023targetingcrafkinase pages 14-15, riaud2024theroleof pages 9-10)

6.2 Cancer alterations and statistics

Somatic RAF1 activation occurs through point mutations, amplification, fusions, overexpression and adaptive recruitment downstream of oncogenic RAS. Estimates vary with cohort and alteration definition: reviews report activating mutation frequencies near 0.7%, whereas one TCGA-oriented analysis reported RAF1 mutations in 2.3% of cancers. Examples include 5.41% (24/444) in cutaneous melanoma and 4.54% (24/529) in uterine endometrial carcinoma. RAF1 amplification was reported in 10.71% (44/411) of a TCGA bladder-cancer cohort and 3.8% (139/3,844) in GENIE v3. (wang2023targetingcrafkinase pages 14-15, wang2023targetingcrafkinase pages 15-16, riaud2024theroleof pages 7-8)

RAF1 fusions occur in several cancers and may be especially enriched in pancreatic acinar-cell carcinoma—reported at up to 18.5%—but generally occur around 0.5–1% in prostate cancer, melanoma and pancreatic cancers considered more broadly. Named fusions include QKI–RAF1, GOLGA4–RAF1, ATG7–RAF1, LRRFIP2–RAF1 and MTAP–RAF1. (riaud2024theroleof pages 6-7, wang2023targetingcrafkinase pages 15-16, riaud2024theroleof pages 16-16)

Functionally characterized activating or resistance-associated variants include S257L/P, S259 substitutions, P261 substitutions, G361A/R/S, R391W and E478K. Many disrupt inhibitory regulation or enhance dimer-dependent signaling. G361A can signal with relative RAS independence, whereas numerous other high-activity mutants remain dimer- and RAS-dependent. In a 2024 synthesis, 9% of tumors carrying oncogenic RAF1 mutations also had oncogenic BRAF alterations, nearly all non-V600. (riaud2024theroleof pages 9-10, riaud2024theroleof pages 10-11, riaud2024theroleof pages 8-9)

RAF1 also mediates acquired resistance without a primary RAF1 driver: increased CRAF expression or RTK–RAS–CRAF signaling can bypass BRAF inhibition; RAF1 mutations and fusions can contribute to KRAS-G12C-inhibitor resistance; and RAF1 amplification has appeared during trametinib resistance. (riaud2024theroleof pages 10-11)

7. Recent developments, 2023–2024

Regulatory and structural understanding

Two authoritative 2024 reviews emphasized that RAF activation is an integrated transition among 14-3-3-bound autoinhibited monomers, RAS/membrane-associated intermediates and active dimers, rather than a simple recruitment event. They also highlighted RAF1’s stronger dependence on HSP90–CDC37 and mechanistic differences between CRAF and BRAF—important because many earlier structural conclusions were extrapolated from BRAF. (spencersmith2024regulationofraf pages 6-7, spencersmith2024regulationofraf pages 1-3)

The 2024 RAS-to-RAF synthesis further framed the functional switch as a multiprotein assembly involving RAF, its MEK substrate and 14-3-3. This model helps explain why mutations, dimerization and ATP-site inhibitors can produce nonintuitive outcomes, including transactivation and paradoxical ERK signaling. (jeon2024signalingfromras pages 18-20)

Cancer biology

The 2024 Nature Reviews Cancer analysis concluded that CRAF contributes to tumor progression through both MAPK-dependent and MAPK-independent mechanisms and is increasingly relevant as a resistance node. It also stressed that “RAF1 alteration” is not one biomarker class: high-activity mutations, low-activity dimer-promoting mutations, fusions and amplifications may require different therapeutic combinations. (riaud2024theroleof pages 5-6, riaud2024theroleof pages 13-14)

8. Applications and therapeutic implementation

Established clinical practice

RAF-pathway inhibitors are clinically established for selected BRAF-driven malignancies, but these are not selective RAF1 therapies. As of the reviewed 2023–2024 literature, no selective RAF1/CRAF inhibitor had regulatory approval. Vemurafenib, dabrafenib and encorafenib target BRAF-mutant disease; sorafenib is a multikinase inhibitor. Their clinical use should not be described as direct validation of RAF1-selective therapy. (scardaci2024novelraf‐directedapproaches pages 2-3, wang2023targetingcrafkinase pages 1-2)

First-generation BRAF inhibitors can promote RAF1 homodimerization or BRAF–RAF1 heterodimerization in RAS-active, BRAF-wild-type cells, causing paradoxical MEK–ERK activation. This is a central reason that BRAF-V600-selective drugs are unsuitable as generic RAF1 inhibitors. (wang2023targetingcrafkinase pages 21-23, scardaci2024novelraf‐directedapproaches pages 2-3)

Investigational strategies

Type-II pan-RAF or RAF-dimer inhibitors—including belvarafenib, lifirafenib, naporafenib, tovorafenib, LY3009120, LXH254 and exarafenib—are designed to inhibit RAF dimers while reducing paradoxical activation. Pan-RAF combinations with MEK, ERK, EGFR, SHP2, CDK4/6 or immunotherapy are being explored according to genotype and resistance mechanism. (riaud2024theroleof pages 13-14, riaud2024theroleof pages 11-12, riaud2024theroleof pages 17-17)

Clinical activity remains heterogeneous. Across early trials summarized in 2024, reported response rates ranged from 0% for LY3009120 to 64% for tovorafenib, but populations and biomarkers differed and these values cannot be interpreted as RAF1-specific efficacy. A MEK–RAF inhibitor, CH5126766, produced objective responses in 27% of 26 evaluable patients in phase I study NCT02407509. A retrospective report of 13 RAF1-altered tumors treated with MAPK-targeted combinations observed a 69% response rate, although the review explicitly cautioned that publication bias likely inflated this estimate. (wang2023targetingcrafkinase pages 21-23, riaud2024theroleof pages 11-12, riaud2024theroleof pages 10-11)

A major emerging idea is RAF1 degradation, because removing the protein could eliminate both catalytic and scaffold functions. In 2023–2024 this remained a preclinical rationale rather than a validated clinical implementation; most published RAF degraders were BRAF-directed, and selective RAF1 degradation had not reached an established therapeutic standard. (scardaci2024novelraf‐directedapproaches pages 2-3, wang2023targetingcrafkinase pages 1-2)

9. Expert interpretation and annotation confidence

  1. Primary molecular function—high confidence: ATP-dependent serine phosphorylation of MEK1/2 in the RAS–RAF–MEK–ERK cascade. (matallanas2011raffamilykinases pages 8-9, roskoski2010rafproteinserinethreoninekinases pages 2-3)
  2. Primary site of canonical action—high confidence: the inner plasma membrane after recruitment from an inactive cytosolic pool by RAS-GTP. (riaud2024theroleof pages 1-2, bahar2023targetingtherasrafmapk pages 5-6)
  3. Regulatory mechanism—high confidence: autoinhibition by regulatory-domain/kinase-domain contacts and 14-3-3, relieved by membrane engagement, Ser259 dephosphorylation, conformational remodeling and RAF dimerization. (spencersmith2024regulationofraf pages 6-7, riaud2024theroleof pages 1-2)
  4. Noncatalytic/scaffold function—moderate-to-high confidence: substantial genetic and biochemical support exists, especially for apoptosis control and KRAS-driven tumor maintenance, but its magnitude is tissue- and model-dependent. (riaud2024theroleof pages 5-6, riaud2024theroleof pages 16-16)
  5. Alternative direct substrates—lower confidence: BAD and other proposed proteins should be annotated as context-dependent or provisional rather than equivalent to MEK1/2. (matallanas2011raffamilykinases pages 8-9, riaud2024theroleof pages 5-6)
  6. Therapeutic tractability—emerging: RAF1 is actionable biologically, but kinase inhibition alone may not remove its scaffold functions. Biomarker-defined pan-RAF combinations and eventual RAF1-directed degraders are more mechanistically compelling than indiscriminate CRAF ATP-site inhibition, but clinical validation remains incomplete. (riaud2024theroleof pages 13-14, wang2023targetingcrafkinase pages 1-2)

Key recent sources

References

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Artifacts

Citations

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