Novel type aquaporin SIPs are mainly localized to the ER membrane and show cell-specific expression in Arabidopsis thaliana

We investigated the fourth subgroup of Arabidopsis aquaporin, small and basic intrinsic proteins (SIPs). When they were expressed in yeast, SIP1;1 and SIP1;2, but not SIP2;1, gave water-channel activity. The transient expression of SIPs linked with green fluorescent protein in Arabidopsis cells and...

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Veröffentlicht in:FEBS letters 2005-10, Vol.579 (25), p.5814-5820
Hauptverfasser: Ishikawa, Fumiyoshi, Suga, Shinobu, Uemura, Tomohiro, Sato, Masa H., Maeshima, Masayoshi
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container_end_page 5820
container_issue 25
container_start_page 5814
container_title FEBS letters
container_volume 579
creator Ishikawa, Fumiyoshi
Suga, Shinobu
Uemura, Tomohiro
Sato, Masa H.
Maeshima, Masayoshi
description We investigated the fourth subgroup of Arabidopsis aquaporin, small and basic intrinsic proteins (SIPs). When they were expressed in yeast, SIP1;1 and SIP1;2, but not SIP2;1, gave water-channel activity. The transient expression of SIPs linked with green fluorescent protein in Arabidopsis cells and the subcellular fractionation of the tissue homogenate showed their ER localization. The SIP proteins were detected in all of the tissues, except for dry seeds. Histochemical analysis of promoter-β-glucuronidase fusions revealed the cell-specific expression of SIPs. SIP1;1 and SIP1;2 may function as water channels in the ER, while SIP2;1 might act as an ER channel for other small molecules or ions.
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subjects AHA3
Aquaporin
Aquaporins - analysis
Aquaporins - genetics
Aquaporins - metabolism
Arabidopsis
Arabidopsis - metabolism
Arabidopsis plasma-membrane H+-ATPase 3
Arabidopsis Proteins - analysis
Arabidopsis Proteins - genetics
Arabidopsis Proteins - metabolism
binding protein
BiP
Endoplasmic Reticulum - chemistry
Endoplasmic Reticulum - metabolism
Gene Expression
GFP
green fluorescent protein
Green Fluorescent Proteins - analysis
Green Fluorescent Proteins - genetics
GUS
Intracellular Membranes - chemistry
Intracellular Membranes - metabolism
NIP
Nod26-like intrinsic proteins
PIP
plasma-membrane intrinsic protein
Promoter Regions, Genetic
Saccharomyces cerevisiae - genetics
SIP
Small and basic intrinsic protein
TIP
Tissue Distribution
tonoplast intrinsic protein
vacuolar H+-ATPase
VHA
Water channel
β-glucuronidase
title Novel type aquaporin SIPs are mainly localized to the ER membrane and show cell-specific expression in Arabidopsis thaliana
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