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Endosomal sorting of Notch receptors through COMMD9-dependent pathways modulates Notch signaling
Abstract
Notch family members are transmembrane receptors that mediate essential developmental programs. Upon ligand binding, a proteolytic event releases the intracellular domain of Notch, which translocates to the nucleus to regulate gene transcription. In addition, Notch trafficking across the endolysosomal system is critical in its regulation. In this study we report that Notch recycling to the cell surface is dependent on the COMMD–CCDC22–CCDC93 (CCC) complex, a recently identified regulator of endosomal trafficking. Disruption in this system leads to intracellular accumulation of Notch2 and concomitant reduction in Notch signaling. Interestingly, among the 10 copper metabolism MURR1 domain containing (COMMD) family members that can associate with the CCC complex, only COMMD9 and its binding partner, COMMD5, have substantial effects on Notch. Furthermore, Commd9 deletion in mice leads to embryonic lethality and complex cardiovascular alterations that bear hallmarks of Notch deficiency. Altogether, these studies highlight that the CCC complex controls Notch activation by modulating its intracellular trafficking and demonstrate cargo-specific effects for members of the COMMD protein family.
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Retriever and CCC play crucial roles in endosomal recycling of membrane proteins.
“Retriever, a trimeric complex of VPS35L, VPS26C and VPS29, together with the CCC complex comprising CCDC22, CCDC93, and COMMD proteins, plays a crucial role in this process.”
From Structural organization of the retriever–CCC endosomal recycling complex (2024) · cites this paper as [23]
The Introduction identifies CCC as a COMMD–CCDC22–CCDC93 complex, and the Discussion reports its role in endosomal sorting and delivery of Notch to the cell surface (page numbers unavailable). The paper discusses retromer, not Retriever; it does not establish Retriever’s stated composition or role alongside CCC. (LLM, conf=0.88)
Experimental — accuracy not yet measuredCCDC22, CCDC93, and seven COMMDs form the CCC complex, which is required for endosomal recycling of certain cargos including copper transporters, Notch family members and LDLR.
“These form the CCC complex39, shown to be required for the endosomal recycling of certain cargos, including copper transporters39, Notch family members39, 40 and LDLR41.”
From Retriever is a multiprotein complex for retromer-independent endosomal cargo recycling (2017) · cites this paper as [40]
The Introduction identifies CCDC22 and CCDC93 as CCC-complex components and reports COMMD1-dependent endosomal sorting of the copper transporter ATP7A. The Results show that loss of COMMD9 or other CCC components reduces cell-surface Notch2 and causes its accumulation in early endosomes. Our copy does not establish that the complex contains exactly seven COMMDs; it instead describes variable COMMD-containing configurations. LDLR is cited separately as reference 41 in the citing sentence, so it is not assessed as a claim attributed to this paper. (LLM, conf=0.86)
Experimental — accuracy not yet measuredThe CCC complex has been recognized for its role in regulating endosomal recycling of various cargos.
“The CCC complex is a molecular assembly that has been recognized for its role in regulating endosomal recycling of various cargos20,27,30–32,34”
From Endosomal PI(3)P regulation by the COMMD/CCDC22/CCDC93 (CCC) complex controls membrane protein recycling (2019) · cites this paper as [34]
Retriever is a trimeric complex of VPS35L, VPS26C and VPS29.
“Retriever, a trimeric complex of VPS35L, VPS26C and VPS29, together with the CCC complex comprising CCDC22, CCDC93, and COMMD proteins, plays a crucial role in this process.”
From Structural organization of the retriever–CCC endosomal recycling complex (2024) · cites this paper as [23]
The Results section on the COMMD9 interactome identifies CCC components, and the Results section on Notch2 surface levels discusses the retromer subunit VPS35; neither describes Retriever. Searches for Retriever, VPS35L, VPS26C, and the proposed trimer found no passage in our copy establishing its composition. Page numbers were not available. (LLM, conf=0.76)
Experimental — accuracy not yet measuredLoss of VPS35L impairs ITGB1 endosomal recycling, observed in Huh-7 VPS35L knockout cells rescued by empty vector with significant endosomal trapping of ITGB1.
“Loss of VPS35L is known to impair ITGB1 endosomal recycling22,23, which was also observed in Huh-7 VPS35L knockout cells rescued by empty vector (EV), where we observed significant endosomal trapping of ITGB1 (Fig. 4C, D).”
From Structural organization of the retriever–CCC endosomal recycling complex (2024) · cites this paper as [23]
HeLa cells with VPS26C deficiency generated using CRISPR/Cas9 and complemented with HA-tagged VPS26C have been previously reported.
“HeLa cells with VPS26C deficiency (generated using CRISPR/Cas9) and complemented with HA-tagged VPS26C have been previously reported23.”
From Structural organization of the retriever–CCC endosomal recycling complex (2024) · cites this paper as [23]
Absence of COMMD9 resulted in reduced Notch-dependent signaling, and deletion of Commd9 led to embryonic lethality in mice due to abnormal cardiovascular development.
“Absence of COMMD9 resulted in reduced Notch-dependent signaling, and deletion of Commd9 led to embryonic lethality in mice due to abnormal cardiovascular development [47].”
From Genetic variation in CCDC93 is associated with elevated central systolic blood pressure, impaired arterial relaxation, and mitochondrial dysfunction (2024) · cites this paper as [47]
Recycling to the cell surface of Notch is dependent on the CCC complex.
“The recycling to the cell surface of Notch is dependent on the CCC complex [46,47].”
From Genetic variation in CCDC93 is associated with elevated central systolic blood pressure, impaired arterial relaxation, and mitochondrial dysfunction (2024) · cites this paper as [47]
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Cites
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Metadata
- Authors
- Li, H., Koo, Y., Mao, X., Sifuentes-Dominguez, L., Morris, L. L., Jia, D., Miyata, N., Faulkner, R. A., van Deursen, J. M., Vooijs, M., Billadeau, D. D., van de Sluis, B., Cleaver, O., & Burstein, E.
- Venue
- Journal of Cell Biology
- Publisher
- Rockefeller University Press
- Published
- 2015-11-09
- Volume
- 211
- Issue
- 3
- Pages
- 605-617
- ISSN
- 0021-9525
- 1540-8140
- PMC
- PMC4639872
- Cited by
- 73
- References
- 1
- Language
- en
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