title: Gene expression and characterization of isoprene synthase from Populus alba.
abstract: Isoprene synthase cDNA from Populus alba (PaIspS) was isolated by RT-PCR. This PaIspS mRNA, which was predominantly observed in the leaves, was strongly induced by heat stress and continuous light irradiation, and was substantially decreased in the dark, suggesting that isoprene emission was regulated at the transcriptional level. The subcellular localization of PaIspS protein with green fluorescent protein fusion was shown to be in plastids. PaIspS expressed in Escherichia coli was characterized enzymatically: it had an optimum pH of approximately 8.0, and an optimum temperature 40 degrees C. Its preference for divalent cations for its activity was also studied.
authors.affiliation: Laboratory of Plant Gene Expression, Research Institute for Sustainable Humanosphere, Kyoto University, Gokasho, Uji, Japan.
authors.forename: Kanako
authors.initials: K
authors.lastname: Sasaki
authors.forename: Kazuaki
authors.initials: K
authors.lastname: Ohara
authors.forename: Kazufumi
authors.initials: K
authors.lastname: Yazaki
mesh_terms: D019883:Alkyl and Aryl Transferases / Q000235:genetics* / Q000378:metabolism*; D003001:Cloning, Molecular; D018076:DNA, Complementary / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic; D018506:Gene Expression Regulation, Plant; D006863:Hydrogen-Ion Concentration; D032107:Populus / Q000201:enzymology* / Q000235:genetics*; D021381:Protein Transport; D012333:RNA, Messenger / Q000235:genetics / Q000378:metabolism; D011994:Recombinant Proteins / Q000235:genetics / Q000378:metabolism; D017422:Sequence Analysis, DNA; D013696:Temperature
chemical_list: D018076:DNA, Complementary; D012333:RNA, Messenger; D011994:Recombinant Proteins; D019883:Alkyl and Aryl Transferases; C093854:isoprene synthase