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2013 ; 2
(1
): 72-86
Nephropedia Template TP
gab.com Text
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PiSCP1 and PiCDPK2 Localize to Peroxisomes and Are Involved in Pollen Tube Growth
in Petunia Inflata
#MMPMID27137367
Guo F
; Yoon GM
; McCubbin AG
Plants (Basel)
2013[Mar]; 2
(1
): 72-86
PMID27137367
show ga
Petunia inflata small CDPK-interacting protein 1 (PiSCP1) was identified as a
pollen expressed PiCDPK1 interacting protein using the yeast two hybrid system
and the interaction confirmed using pull-down and phosphorylation assays. PiSCP1
is pollen specific and shares amino acid homology with uncharacterized proteins
from diverse species of higher plants, but no protein of known function.
Expression of PiSCP1-GFP in vivo inhibited pollen tube growth and was shown to
localize to peroxisomes in growing pollen tubes. As PiCDPK1 is plasma membrane
localized, we investigated the localization of a second isoform, PiCDPK2, and
show that it co-localizes to peroxisomes with PiSCP1 and that the two proteins
interact in the yeast 2 hybrid interaction assay, suggesting that interaction
with the latter CDPK isoform is likely the one of biological relevance. Both
PiCDPK2 and PiSCP1 affect pollen tube growth, presumably by mediating peroxisome
function, however how they do so is currently not clear.