Open AccessHigh Temporal Resolution Reveals Simultaneous Plasma Membrane Recruitment of TPLATE Complex Subunits
Author(s) -
Jie Wang,
Evelien Mylle,
Alexander Johnson,
Nienke Besbrugge,
Geert De Jaeger,
Jìří Friml,
Roman Pleskot,
Daniël Van Damme
Publication year - 2020
Publication title -
plant physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.554
H-Index - 312
eISSN - 1532-2548
pISSN - 0032-0889
DOI - 10.1104/pp.20.00178
Subject(s) - endocytic cycle , arabidopsis , endocytosis , colocalization , protein subunit , cytoplasm , microbiology and biotechnology , arabidopsis thaliana , biology , signal transducing adaptor protein , biophysics , biochemistry , cell , gene , signal transduction , mutant
The TPLATE complex (TPC) is a key endocytic adaptor protein complex in plants. TPC in Arabidopsis ( Arabidopsis thaliana ) contains six evolutionarily conserved subunits and two plant-specific subunits (AtEH1/Pan1 and AtEH2/Pan1) which, although cytoplasmic proteins, are not associated with the hexameric subcomplex in the cytoplasm. To investigate the dynamic assembly of the octameric TPC at the plasma membrane (PM), we performed state-of-the-art dual-color live-cell imaging at physiological and lowered temperatures. Lowering the temperature slowed down endocytosis, thereby enhancing the temporal resolution of the differential recruitment of endocytic components. Under both normal and lowered temperature conditions, the core TPC subunit TPLATE and the AtEH/Pan1 proteins exhibited simultaneous recruitment at the PM. These results, together with colocalization analysis of different TPC subunits, allow us to conclude that the TPC in plant cells is not recruited to the PM sequentially but as an octameric complex.
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