title: [Cloning and bioinformatics analysis of cycloartenol synthase (HcCAS1) gene in Huperzia carinata].
abstract: OBJECTIVE
  To clone and sequence the open reading frame of cycloartenol synthase (CAS) from Huperzia carinata.
  
  
  METHODS
  After searching the transcriptome dataset of H. carinata, one unique sequence containing oxide squalene cyclases domain was discovered. The primers were designed according to the cDNA sequence of CAS from the dataset. And then, the open reading frame of CAS was cloned by RT-PCR strategy with the template of mixed RNA extracted from root, stem and leaf of H. carinata. The bioinformatic analysis of this gene and its corresponding protein was performed.
  
  
  RESULTS
  One unique sequence of CAS, named as HcCAS1 (GenBank accession number JN790125) , was cloned from H. carinata. The open reading frame of HcCAS1 consists of 2 474 bp, encoding one polypeptide with 757 amino acids.
  
  
  CONCLUSIONS
  This study cloned and analyzed CAS from H. carinata for the first time. The result will provide a foundation for exploring the mechanism of sterol biosynthesis in Huperziaceae plants.
authors.affiliation: The Key Laboratory of Bioactive Substances and Resources Utilization of Chinese Herbal Medicine, Ministry of Education, Institute of Medicinal Plant Development, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100193, China. niuyunyun@implad.ac.cn
authors.forename: Yunyun
authors.initials: Y
authors.lastname: Niu
authors.forename: Hongmei
authors.initials: H
authors.lastname: Luo
authors.forename: Shilin
authors.initials: S
authors.lastname: Chen
authors.forename: Linfang
authors.initials: L
authors.lastname: Huang
mesh_terms: D000595:Amino Acid Sequence; D003001:Cloning, Molecular; D019295:Computational Biology; D019143:Evolution, Molecular; D032501:Huperzia / Q000201:enzymology* / Q000235:genetics*; D019751:Intramolecular Transferases / Q000737:chemistry / Q000235:genetics* / Q000378:metabolism; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010802:Phylogeny; D017433:Protein Structure, Secondary
chemical_list: D019751:Intramolecular Transferases; C021923:cycloartenol synthase