Cloning and molecular characterisation of a gene encoding cytochrome P450 C-23 steroid hydroxylase (CYP90) from aspen.
Gene CPD (constitutive photomorphogenesis and dwarf) encodes a cytochrome P450 steroid side-chain hydroxylase (CYP90) involved in biosynthesis of brassinosteroids (BRs) in Arabidopsis thanalia. To dissect the molecular mechanism underlying the biosynthesis and action of the new phytohormone in perennial woody plants, a 1442 bp cDNA and a 1900 bp genomic DNA fragments whose 3'- half was well overlapped with the 5'-half of the former were obtained from a hybrid aspen (Populus tremula x tremudelois) by screening of the cDNA and genomic DNA libraries of this tree using a cDNA fragment from the Arabidopsis CPD gene in the present study. Sequence analysis revealed that the open reading frame comprising the cDNA and genomic DNA fragments encoded a protein of 476 amino acids with a molecular weight of 63 kD. This protein is four amino acid residues longer than Arabidopsis CYP90, and 78.32% identical to the latter. Also it shared high homologies with the Arabidopsis CYP90 in all known functional domains,including steroid-binding region closely related to BR biosynthesis, indicating a high conservatism of the putative CDP gene between annual herb and perennial woody plant species.
Wang
Xin-Yu
XY
School of Life Sciences, Lanzhou University, Lanzhou 730000, China. wangxy@lzu.edu.cn
Wang
Chong-Ying
CY
Olsson
Olof
O
D000595:Amino Acid Sequence; D029681:Arabidopsis Proteins / Q000235:genetics*; D003001:Cloning, Molecular; D003577:Cytochrome P-450 Enzyme System / Q000235:genetics*; D018076:DNA, Complementary / Q000737:chemistry / Q000235:genetics; D018744:DNA, Plant / Q000737:chemistry / Q000235:genetics; D008969:Molecular Sequence Data; D016366:Open Reading Frames / Q000235:genetics; D010802:Phylogeny; D010940:Plant Proteins / Q000235:genetics*; D032107:Populus / Q000201:enzymology / Q000235:genetics*; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid; D013250:Steroid Hydroxylases / Q000235:genetics*
D029681:Arabidopsis Proteins; D018076:DNA, Complementary; D018744:DNA, Plant; D010940:Plant Proteins; D003577:Cytochrome P-450 Enzyme System; C113844:CPD protein, Arabidopsis; D013250:Steroid Hydroxylases