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Microarray expression profiling and functional characterization of AtTPS genes: duplicated Arabidopsis thaliana sesquiterpene synthase genes At4g13280 and At4g13300 encode root-specific and wound-inducible (Z)-gamma-bisabolene synthases.

Abstract：

:The Arabidopsis thaliana genome contains at least 32 terpenoid synthase (AtTPS) genes [Aubourg et al., Mol. Genet. Genom. 267 (2002) 730] a few of which have recently been characterized. Based on hierarchical cluster analysis of AtTPS gene expression, measured by microarray profiling and validated with published expression data, we identified two groups of predominantly root expressed AtTPS genes containing five members with previously unknown biochemical functions (At4g13280, At4g13300, At5g48110, At1g33750, and At3g29410). Among the root expressed AtTPS genes, a pair of tandem-organized genes, At4g13280 (AtTPS12) and At4g13300 (AtTPS13), shares 91% predicted amino acid identity indicating recent gene duplication. Bacterial expression of cDNAs and enzyme assays showed that both At4g13280 and At4g13300 encode sesquiterpene synthases catalyzing the conversion of farnesyl diphosphate to (Z)-gamma-bisabolene and the additional minor products E-nerolidol and alpha-bisabolol. Expression of beta-glucuronidase (GUS) reporter gene fused to upstream genomic regions of At4g13280 or At4g13300 showed constitutive promoter activities in the cortex and sub-epidermal layers of Arabidopsis roots. In addition, highly localized promoter activities were found in leaf hydathodes and flower stigmata. Mechanical wounding of Arabidopsis leaves induced local expression of At4g13280 and At4g13300. The functional characterization of At4g13280 gene product AtTPS12 and At4g13230 gene product AtTPS13 as (Z)-gamma-bisabolene synthases, together with the recent characterization of two flower-specific AtTPS [At5g23960 and At5g44630; Tholl et al., Plant J. 42 (2005) 757], concludes the biochemical functional annotation of all four predicted Arabidopsis sesquiterpene synthase genes. Our data suggest biological functions for At4g13280 and At4g13300 in the rhizosphere with additional roles in aerial plant tissues.

journal_name

Arch Biochem Biophys

journal_title

Archives of biochemistry and biophysics

authors

Ro DK,Ehlting J,Keeling CI,Lin R,Mattheus N,Bohlmann J

doi

10.1016/j.abb.2005.09.019

subject

Has Abstract

pub_date

2006-04-15 00:00:00

pages

104-16

issue

1-2

eissn

0003-9861

issn

1096-0384

pii

S0003-9861(05)00407-8

journal_volume

448

pub_type

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