期刊
JOURNAL OF CELL SCIENCE
卷 128, 期 7, 页码 1386-1399出版社
COMPANY OF BIOLOGISTS LTD
DOI: 10.1242/jcs.163857
关键词
Rho GTPase-activating protein; Endocytosis; Rab8; Tumor suppressor; EGFR signaling
类别
资金
- Deutsche Krebshilfe [109033]
- Heisenberg program of the Deutsche Forschungsgemeinschaft
Membrane trafficking is known to be coordinated by small GTPases, but the identity of their regulators, the guanine nucleotide exchange factors (GEFs) and GTPase-activating proteins (GAPs) that ensure balanced GTPase activation at different subcellular sites is largely elusive. Here, we show in living cells that deleted in liver cancer 3 (DLC3, also known as STARD8) is a functional Rho-specific GAP protein, the loss of which enhances perinuclear RhoA activity. DLC3 is recruited to Rab8-positive membrane tubules and is required for the integrity of the Rab8 and Golgi compartments. Depletion of DLC3 impairs the transport of internalized transferrin to the endocytic recycling compartment (ERC), which is restored by the simultaneous downregulation of RhoA and RhoB. We further demonstrate that DLC3 loss interferes with epidermal growth factor receptor (EGFR) degradation associated with prolonged receptor signaling. Taken together, these findings identify DLC3 as a novel component of the endocytic trafficking machinery, wherein it maintains organelle integrity and regulates membrane transport through the control of Rho activity.
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