NDLI: Functional characterization of BjCET3 and BjCET4, two new cation-efflux transporters from Brassica juncea L.

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Functional characterization of BjCET3 and BjCET4, two new cation-efflux transporters from Brassica juncea L.

Content Provider	PubMed Central
Author	Lang, Minglin Hao, Mengyu Fan, Qiangwang Wang, Wei Mo, Shaojing Zhao, Weicheng Zhou, Jie
Copyright Year	2011
Abstract	Brassica juncea is promising for metal phytoremediation, but little is known about the functional role of most metal transporters in this plant. The functional characterization of two B. juncea cation-efflux family proteins BjCET3 and BjCET4 is reported here. The two proteins are closely related to each other in amino acid sequence, and are members of Group III of the cation-efflux transporters. Heterologous expression of BjCET3 and BjCET4 in yeast confirmed their functions in exporting Zn, and possibly Cd, Co, and Ni. Yeast transformed with BjCET4 showed higher metal resistance than did BjCET3 transformed. The two BjCET–GFP fusion proteins were localized to the plasma membrane in the roots when expressed in tobacco, and significantly enhanced the plants’ Cd tolerance ability. Under Cd stress, tobacco plants transformed with BjCET3 accumulated significant amounts of Cd in shoots, while maintaining similar shoot biomass production with vector-control subjects. Transformed BjCET4 tobacco plants showed significantly enhanced shoot biomass production with markedly decreased shoot Cd content. The two transporter genes have a lower basal transcript expression in B. juncea seedling tissues when grown in normal conditions than under metal-stress, however, their transcripts levels could be substantially increased by Zn, Cd, NaCl or PEG, suggesting that BjCET3 and BjCET4 may play roles in several stress conditions, roles which appear to be different from those of previous characterized cation-efflux transporters, for example, AtMTP1, BjCET2, and BjMTP1.
Related Links	http://dx.doi.org/10.1093/jxb/err137
Ending Page	4480
Page Count	14
Starting Page	4467
File Format	PDF
ISSN	00220957
e-ISSN	14602431
Journal	Journal of Experimental Botany
Issue Number	13
Volume Number	62
Language	English
Publisher	Oxford University Press
Publisher Date	2011-08-01
Access Restriction	Open
Rights Holder	Oxford University Press
Subject Keyword	Plant Science Physiology Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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