PXD032072 is an
original dataset announced via ProteomeXchange.
Dataset Summary
Title | The PripA-TbcrA complex-centered Rab GAP cascade facilitates macropinosome maturation in Dictyostelium |
Description | Macropinocytosis, an evolutionarily conserved mechanism mediating nonspecific bulk uptake of extracellular fluid, has been ascribed diverse functions. How nascent macropinosomes mature after internalization remains largely unknown. By searching for proteins that localize on macropinosomes during the Rab5-to-Rab7 transition stage in Dictyostelium, we uncover a complex composed of two proteins, which we name PripA and TbcrA. We show that the Rab5-to-Rab7 conversion involves fusion of Rab5-marked early macropinosomes with Rab7-marked late macropinosomes. PripA links the two membrane compartments by interacting with PI(3,4)P2 and Rab7. In addition, PripA recruits TbcrA, which acts as a GAP, to turn off Rab5. Thus, the conversion to Rab7 is linked to inactivation of the upstream Rab5. Consistently, disruption of either pripA or tbcrA impairs Rab5 inactivation and macropinocytic cargo processing. Therefore, the PripA-TbcrA complex is the central component of a Rab GAP cascade that facilitates programmed Rab switch and efficient cargo trafficking during macropinosome maturation. |
HostingRepository | PRIDE |
AnnounceDate | 2022-03-14 |
AnnouncementXML | Submission_2022-03-14_02:41:42.541.xml |
DigitalObjectIdentifier | |
ReviewLevel | Peer-reviewed dataset |
DatasetOrigin | Original dataset |
RepositorySupport | Unsupported dataset by repository |
PrimarySubmitter | Hui Tu |
SpeciesList | scientific name: Dictyostelium discoideum (Slime mold); NCBI TaxID: 44689; |
ModificationList | No PTMs are included in the dataset |
Instrument | Q Exactive |
Dataset History
Revision | Datetime | Status | ChangeLog Entry |
0 | 2022-03-05 05:20:26 | ID requested | |
⏵ 1 | 2022-03-14 02:41:42 | announced | |
Publication List
Dataset with its publication pending |
Keyword List
submitter keyword: macropinocytosis, PripA, TbcrA, Rab5, Rab7 |
Contact List
Huaqing Cai |
contact affiliation | Institute of Biophysics, Chinese Academy of Sciences |
contact email | huaqingcai@ibp.ac.cn |
lab head | |
Hui Tu |
contact affiliation | Insititute of Biophysics |
contact email | 18070285210@163.com |
dataset submitter | |
Full Dataset Link List
Dataset FTP location
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PRIDE project URI |
Repository Record List
[ + ]
[ - ]
- PRIDE
- PXD032072
- Label: PRIDE project
- Name: The PripA-TbcrA complex-centered Rab GAP cascade facilitates macropinosome maturation in Dictyostelium