Subcellular localization of rice acyl‐CoA‐binding proteins (ACBPs) indicates that Os ACBP 6:: GFP is targeted to the peroxisomes
Summary Acyl‐CoA‐binding proteins ( ACBP s) show conservation at the acyl‐CoA‐binding ( ACB ) domain which facilitates binding to acyl‐CoA esters. In Arabidopsis thaliana , six ACBP s participate in development and stress responses. Rice ( Oryza sativa ) also contains six genes encoding ACBP s. We i...
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Published in | The New phytologist Vol. 203; no. 2; pp. 469 - 482 |
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Main Authors | , , , , |
Format | Journal Article |
Language | English |
Published |
01.07.2014
|
Online Access | Get full text |
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Summary: | Summary
Acyl‐CoA‐binding proteins (
ACBP
s) show conservation at the acyl‐CoA‐binding (
ACB
) domain which facilitates binding to acyl‐CoA esters. In
Arabidopsis thaliana
, six
ACBP
s participate in development and stress responses. Rice (
Oryza sativa
) also contains six genes encoding
ACBP
s. We investigated differences in subcellular localization between monocot rice and eudicot
A. thaliana
ACBP
s.
The subcellular localization of the six Os
ACBP
s was achieved via transient expression of green fluorescence protein (
GFP
) fusions in tobacco (
Nicotiana tabacum
) epidermal cells, and stable transformation of
A. thaliana
. As plant
ACBP
s had not been reported in the peroxisomes, Os
ACBP
6::
GFP
localization was confirmed by transient expression in rice sheath cells. The function of Os
ACBP
6 was investigated by overexpressing
35S::OsACBP6
in the
peroxisomal abc transporter1
(
pxa1
) mutant defective in peroxisomal fatty acid β‐oxidation.
As predicted, Os
ACBP
1::
GFP
and Os
ACBP
2::
GFP
were localized to the cytosol, and Os
ACBP
4::
GFP
and Os
ACBP
5::
GFP
to the endoplasmic reticulum (
ER
). However, Os
ACBP
3::
GFP
displayed subcellular multi‐localization while Os
ACBP
6::
GFP
was localized to the peroxisomes.
35S::OsACBP6‐OE/pxa1
lines showed recovery in indole‐3‐butyric acid (
IBA
) peroxisomal β‐oxidation, wound‐induced
VEGETATIVE STORAGE PROTEIN1
(
VSP1
) expression and jasmonic acid (
JA
) accumulation.
These findings indicate a role for Os
ACBP
6 in peroxisomal β‐oxidation, and suggest that rice
ACBP
s are involved in lipid degradation in addition to lipid biosynthesis. |
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ISSN: | 0028-646X 1469-8137 |
DOI: | 10.1111/nph.12809 |