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2016 ; 15
(11
): 3473-3487
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Novel Aquaporin Regulatory Mechanisms Revealed by Interactomics
#MMPMID27609422
Bellati J
; Champeyroux C
; Hem S
; Rofidal V
; Krouk G
; Maurel C
; Santoni V
Mol Cell Proteomics
2016[Nov]; 15
(11
): 3473-3487
PMID27609422
show ga
PIP1;2 and PIP2;1 are aquaporins that are highly expressed in roots and bring a
major contribution to root water transport and its regulation by hormonal and
abiotic factors. Interactions between cellular proteins or with other
macromolecules contribute to forming molecular machines. Proteins that
molecularly interact with PIP1;2 and PIP2;1 were searched to get new insights
into regulatory mechanisms of root water transport. For that, a
immuno-purification strategy coupled to protein identification and quantification
by mass spectrometry (IP-MS) of PIPs was combined with data from the literature,
to build thorough PIP1;2 and PIP2;1 interactomes, sharing about 400 interacting
proteins. Such interactome revealed PIPs to behave as a platform for recruitment
of a wide range of transport activities and provided novel insights into
regulation of PIP cellular trafficking by osmotic and oxidative treatments. This
work also pointed a role of lipid signaling in PIP function and enhanced our
knowledge of protein kinases involved in PIP regulation. In particular we show
that 2 members of the receptor-like kinase (RLK) family (RKL1 (At1g48480) and
Feronia (At3g51550)) differentially modulate PIP activity through distinct
molecular mechanisms. The overall work opens novel perspectives in understanding
PIP regulatory mechanisms and their role in adjustment of plant water status.