Proteomics

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Rab5a-VPS34 unnatural amino acid mediated crosslinking


ABSTRACT: The small GTPase Rab5 has an essential role in sorting vesicles arriving to and leaving the early endosome. One key function of Rab5 in this process is the activation of the primordial phosphatidylinositol 3-kinase VPS34, a lipid kinase that phosphorylates phosphatidylinositol (PI) to generate PI3P. Human VPS34 forms two heterotetrameric core complexes known as complexes I and II. Rab5a preferentially activates endocytic complex II in a membrane dependent manner. To map Rab5a-GTP interaction sites in complex II, unnatural amino acid mediated crosslinking was employed by genetic code expansion. A Rab5a mutant, in which the S84 in was replaced by BrCO6K was used for crosslinking mass spectrometry analysis. BrCO6K is a lysine derivative that can crosslink to several amino acids such as cysteines, histidines, lysines and glutamates over distances up to 15 Å (Cigler et al., 2017; Nguyen et al., 2018). Both complex II and VPS34 alone incubated with Rab5a-GTP-BrCO6K gave rise to a cross-linked product that ran slightly above the 120 kDa molecular weight marker, consistent with 102 kDa VPS34 crosslinked to the 24 kDa Rab5a (126 kDa). The gel bands of this crosslinking product in both samples were cut and analysed by LC-MS/MS for identification of crosslinks.

ORGANISM(S): Homo Sapiens (human)

SUBMITTER: Juri Rappsilber 

PROVIDER: PXD023533 | JPOST Repository | Tue Dec 21 00:00:00 GMT 2021

REPOSITORIES: jPOST

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The lipid phosphatidylinositol-3-phosphate (PI3P) is a regulator of two fundamental but distinct cellular processes, endocytosis and autophagy, so its generation needs to be under precise temporal and spatial control. PI3P is generated by two complexes that both contain the lipid kinase VPS34: complex II on endosomes (VPS34/VPS15/Beclin 1/UVRAG), and complex I on autophagosomes (VPS34/VPS15/Beclin 1/ATG14L). The endosomal GTPase Rab5 binds complex II, but the mechanism of VPS34 activation by Rab  ...[more]

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