Multiple tandem duplication of the phenylalanine ammonia-lyase genes in Cucumis sativus L.

Planta
Qing-Mao ShangChun-Juan Dong

Abstract

Phenylalanine ammonia-lyase (PAL) is the first entry enzyme of the phenylpropanoid pathway, and therefore plays a key role in both plant development and stress defense. In many plants, PAL is encoded by a multi-gene family, and each member is differentially regulated in response to environmental stimuli. In the present study, we report that PAL in cucumber (Cucumis sativus L.) is encoded for by a family of seven genes (designated as CsPAL1-7). All seven CsPALs are arranged in tandem in two duplication blocks, which are located on chromosomes 4 and 6, respectively. The cDNA and protein sequences of the CsPALs share an overall high identity to each other. Homology modeling reveals similarities in their protein structures, besides several slight differences, implying the different activities in conversion of phenylalanine. Phylogenic analysis places CsPAL1-7 in a separate cluster rather than clustering with other plant PALs. Analyses of expression profiles in different cucumber tissues or in response to various stress or plant hormone treatments indicate that CsPAL1-7 play redundant, but divergent roles in cucumber development and stress response. This is consistent with our finding that CsPALs possess overlapping but different ci...Continue Reading

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Citations

Apr 6, 2013·Current Opinion in Chemical Biology·Matthew M HeberlingDick B Janssen
Dec 18, 2014·Plant Molecular Biology·Bradley W TonnessenJan E Leach
Jul 3, 2013·International Journal of Molecular Sciences·Teresa DocimoMonica Mattana
Nov 29, 2012·Molecular Biology Reports·Yumei JiangRen Wang
May 1, 2021·International Journal of Molecular Sciences·Renata SłomnickaGrzegorz Bartoszewski

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