PNZIP is a novel mesophyll-specific cDNA that is regulated by phytochrome and the circadian rhythm and encodes a protein with a leucine zipper motif

Plant Physiology
C C ZhengSharman D O'Neill

Abstract

We isolated and characterized a novel light-regulated cDNA from the short-day plant Pharbitis nil that encodes a protein with a leucine (Leu) zipper motif, designated PNZIP (Pharbitis nil Leu zipper). The PNZIP cDNA is not similar to any other gene with a known function in the database, but it shares high sequence homology with an Arabidopsis expressed sequence tag and to two other sequences of unknown function from the cyanobacterium Synechocystis spp. and the red alga Porphyra purpurea, which together define a new family of evolutionarily conserved Leu zipper proteins. PNZIP is a single-copy gene that is expressed specifically in leaf photosynthetically active mesophyll cells but not in other nonphotosynthetic tissues such as the epidermis, trichomes, and vascular tissues. When plants were exposed to continuous darkness, PNZIP exhibited a rhythmic pattern of mRNA accumulation with a circadian periodicity of approximately 24 h, suggesting that its expression is under the control of an endogenous clock. However, the expression of PNZIP was unusual in that darkness rather than light promoted its mRNA accumulation. Accumulation of PNZIP mRNA during the dark is also regulated by phytochrome, since a brief exposure to red light in ...Continue Reading

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Citations

Jan 22, 2005·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Hua XueCheng-Chao Zheng
May 4, 2004·Plant Physiology and Biochemistry : PPB·Ning LiuCheng Chao Zheng
Sep 25, 2003·Annual Review of Plant Biology·Deborah A Berthold, Pål Stenmark
Jan 29, 2014·Plant Physiology and Biochemistry : PPB·Ping WangXiao-Yun Wang
Dec 16, 2003·Proceedings of the National Academy of Sciences of the United States of America·Stephen TotteyPoul Erik Jensen
Feb 13, 1999·Cell·J C Dunlap
Sep 11, 1999·Plant Physiology·D E Somers

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