期刊
FEBS LETTERS
卷 579, 期 25, 页码 5814-5820出版社
WILEY
DOI: 10.1016/j.febslet.2005.09.076
关键词
aquaporin; ER; small and basic intrinsic protein; water channel; Arabidopsis
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-beta-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. (c) 2005 Published by Elsevier B.V.
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