The laccase multigene family in Arabidopsis thaliana: towards addressing the mystery of their gene function(s)
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- 作者：Phanikanth V. Turlapati (1)
Kye-Won Kim (1)
Laurence B. Davin (1)
Norman G. Lewis (1) - 关键词：Promoter ; GUS analysis ; Laccases ; In silico analysis ; Gene expression ; Epigenetic modifications ; Arabidopsis thaliana
- 刊名：Planta
- 出版年：2011
- 出版时间：March 2011
- 年：2011
- 卷：233
- 期：3
- 页码：439-470
- 全文大小：12465KB
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Kye-Won Kim (1)
Laurence B. Davin (1)
Norman G. Lewis (1)
1. Institute of Biological Chemistry, Washington State University, Pullman, WA, 99164-6340, USA
文摘
While laccases, multi-copper glycoprotein oxidases, are often able to catalyze oxidation of a broad range of substrates, such as phenols and amines in vitro, their precise physiological/biochemical roles in higher plants remain largely unclear, e.g., Arabidopsis thaliana contains 17 laccases with only 1 having a known physiological function. To begin to explore their roles in planta, spatial and temporal expression patterns of Arabidopsis laccases were compared and contrasted in different tissues at various development stages using RT-PCR and promoter-GUS fusions. Various cell-specific expressions were noted where specific laccases were uniquely expressed, such as LAC4 in interfascicular fibers and seed coat columella, LAC7 in hydathodes and root hairs, LAC8 in pollen grains and phloem, and LAC15 in seed coat cell walls. Such specific cell-type expression patterns provide new leads and/or strategies into determining their precise physiological/biochemical roles. In addition, there was an apparent redundancy of gene expression patterns for several laccases across a wide variety of tissues, lignified and non-lignified, perhaps indicative of overlapping function(s). Preliminary evidence, based on bioinformatics analyses, suggests that most laccases may also be tightly regulated at both transcriptional (antisense transcripts, histone and DNA methylation) and posttranscriptional (microRNAs) levels of gene expression.