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Gene Review:

LTI65 - protein LOW-TEMPERATURE-INDUCED 65

Arabidopsis thaliana

Synonyms: K24M7.3, K24M7_3, LOW-TEMPERATURE-INDUCED 65, RD29B, RESPONSIVE TO DESSICATION 29B

Nordin, K. et al., Nakashima, K. et al., Han, S.Y. et al., Hua, Z.M. et al., Furihata, T. et al.

Hua, Yang, Fromm,

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High impact information on RD29B

Transgenic plants overexpressing the phosphorylated active form of AREB1 expressed many ABA-inducible genes, such as RD29B, without ABA treatment [1].
In 0.4 m mannitol solution, which mimics the effects of osmotic stress, abamine both inhibited stomatal closure in spinach (Spinacia oleracea) leaves, which was restored by coapplication of ABA, and increased luminescence intensity in transgenic Arabidopsis containing the RD29B promoter-luciferase fusion [2].
In 35S::ABI3 Arabidopsis plants, the expression of RD29B was up-regulated strongly, but that of RD29A was up-regulated weakly [3].
ABA-responsive elements (ABREs) are cis-acting elements and basic leucine zipper (bZIP)-type ABRE-binding proteins (AREBs) are transcriptional activators that function in the expression of RD29B in vegetative tissue of Arabidopsis in response to abscisic acid (ABA) treatment [3].
In contrast to the induction of lti78, which follows separate signal pathways during low-temperature, ABA and drought treatment, the drought induction of lti65 is ABA-dependent and the low-temperature induction appears to be coupled to the ABA biosynthetic pathway [4].

Biological context of RD29B

The Arabidopsis thaliana genome encodes 10 MKKs, but few of these have been shown directly to activate any of the 20 Arabidopsis MAPKs (AtMPKs) and NaCl-, drought- or abscisic acid (ABA)-induced genes RD29A or RD29B [5].
The nucleotide sequences of the two genes, lti78 and lti65, predict novel hydrophilic polypeptides with molecular weights of 77,856 and 64,510, respectively, lti78 corresponding to the cDNA probe [4].

References

Abscisic acid-dependent multisite phosphorylation regulates the activity of a transcription activator AREB1. Furihata, T., Maruyama, K., Fujita, Y., Umezawa, T., Yoshida, R., Shinozaki, K., Yamaguchi-Shinozaki, K. Proc. Natl. Acad. Sci. U.S.A. (2006) [Pubmed]
A novel inhibitor of 9-cis-epoxycarotenoid dioxygenase in abscisic acid biosynthesis in higher plants. Han, S.Y., Kitahata, N., Sekimata, K., Saito, T., Kobayashi, M., Nakashima, K., Yamaguchi-Shinozaki, K., Shinozaki, K., Yoshida, S., Asami, T. Plant Physiol. (2004) [Pubmed]
Transcriptional regulation of ABI3- and ABA-responsive genes including RD29B and RD29A in seeds, germinating embryos, and seedlings of Arabidopsis. Nakashima, K., Fujita, Y., Katsura, K., Maruyama, K., Narusaka, Y., Seki, M., Shinozaki, K., Yamaguchi-Shinozaki, K. Plant Mol. Biol. (2006) [Pubmed]
Differential expression of two related, low-temperature-induced genes in Arabidopsis thaliana (L.) Heynh. Nordin, K., Vahala, T., Palva, E.T. Plant Mol. Biol. (1993) [Pubmed]
Activation of the NaCl- and drought-induced RD29A and RD29B promoters by constitutively active Arabidopsis MAPKK or MAPK proteins. Hua, Z.M., Yang, X., Fromm, M.E. Plant Cell Environ. (2006) [Pubmed]

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