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2017 ; 68
(13
): 3487-3499
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Affinity purification with metabolomic and proteomic analysis unravels diverse
roles of nucleoside diphosphate kinases
#MMPMID28586477
Luzarowski M
; Kosmacz M
; Sokolowska E
; Jasinska W
; Willmitzer L
; Veyel D
; Skirycz A
J Exp Bot
2017[Jun]; 68
(13
): 3487-3499
PMID28586477
show ga
Interactions between metabolites and proteins play an integral role in all
cellular functions. Here we describe an affinity purification (AP) approach in
combination with LC/MS-based metabolomics and proteomics that allows, to our
knowledge for the first time, analysis of protein-metabolite and protein-protein
interactions simultaneously in plant systems. More specifically, we examined
protein and small-molecule partners of the three (of five) nucleoside diphosphate
kinases present in the Arabidopsis genome (NDPK1-NDPK3). The bona fide role of
NDPKs is the exchange of terminal phosphate groups between nucleoside
diphosphates (NDPs) and triphosphates (NTPs). However, other functions have been
reported, which probably depend on both the proteins and small molecules
specifically interacting with the NDPK. Using our approach we identified 23, 17,
and 8 novel protein partners of NDPK1, NDPK2, and NDPK3, respectively, with
nucleotide-dependent proteins such as actin and adenosine kinase 2 being
enriched. Particularly interesting, however, was the co-elution of glutathione
S-transferases (GSTs) and reduced glutathione (GSH) with the affinity-purified
NDPK1 complexes. Following up on this finding, we could demonstrate that NDPK1
undergoes glutathionylation, opening a new paradigm of NDPK regulation in plants.
The described results extend our knowledge of NDPKs, the key enzymes regulating
NDP/NTP homeostasis.