The PripA-TbcrA complex-centered Rab GAP cascade facilitates macropinosome maturation in Dictyostelium

Hui Tu, Zhimeng Wang, Ye Yuan, Xilin Miao, Dong Li, Hu Guo, Yihong Yang and Huaqing Cai ()
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Hui Tu: Institute of Biophysics, Chinese Academy of Sciences
Zhimeng Wang: Institute of Biophysics, Chinese Academy of Sciences
Ye Yuan: Institute of Biophysics, Chinese Academy of Sciences
Xilin Miao: Institute of Biophysics, Chinese Academy of Sciences
Dong Li: Institute of Biophysics, Chinese Academy of Sciences
Hu Guo: Institute of Biophysics, Chinese Academy of Sciences
Yihong Yang: Institute of Biophysics, Chinese Academy of Sciences
Huaqing Cai: Institute of Biophysics, Chinese Academy of Sciences

Nature Communications, 2022, vol. 13, issue 1, 1-15

Abstract: Abstract 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.

Date: 2022
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DOI: 10.1038/s41467-022-29503-1

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