Molecular cloning, characterization and expression analysis of 3-hydroxy-3-methylglutaryl coenzyme A reductase gene from Centella asiatica L.

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• 作者：Ratna Kalita ; Lochana Patar ; Ajit Kumar Shasany…
• 关键词：Centella asiatica ; Triterpenoid biosynthesis ; Cloning ; CaHMGR ; Structure–function
• 刊名：Molecular Biology Reports
• 出版年：2015
• 出版时间：September 2015
• 年：2015
• 卷：42
• 期：9
• 页码：1431-1439
• 全文大小：2,088 KB
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• 作者单位：Ratna Kalita (1)
  Lochana Patar (2)
  Ajit Kumar Shasany (3)
  Mahendra K. Modi (1)
  Priyabrata Sen (1)
  
  1. Department of Agricultural Biotechnology, Assam Agricultural University, Jorhat, 785013, India
  2. Distributed Information Centre (DIC), Assam Agricultural University, Jorhat, 785013, India
  3. Plant Biotechnology Divisions, Central Institute of Medicinal and Aromatic Plants, Lucknow, 226015, India
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Animal Anatomy, Morphology and Histology
  Animal Biochemistry
  
• 出版者：Springer Netherlands
• ISSN：1573-4978

文摘

3-Hydroxy-3-methylglutaryl-CoA reductases (HMGR) plays an important role in catalyzing the first committed step of isoprenoid biosynthesis in the mevelonic (MVA) pathway (catalyzes the conversion of HMG-CoA to MVA) in plants. The present manuscript reports the full length cDNA cloning of HMGR (CaHMGR, GenBank accession number: KJ939450.2) and its characterization from Centella asiatica. Sequence analysis indicated that the cDNA was of 1965 bp, which had an open reading frame of 1617 bp and encoded a protein containing 539 amino-acids with a mol wt of 57.9 kDa. A BLASTp search against non-redundant (nr) protein sequence showed that C. asiatica HMGR (CaHMGR) has 65-1 % identity with HMGRs from different plant species and multi-alignment comparison analysis showed the presence of two motif each corresponding to HMG-CoA-binding and NADP(H)-binding. The Conserved Domain Database analysis predicted that CaHMGR belongs to Class I hydroxymethylglutaryl-coenzyme A (HMG-CoA) reductase. Three-dimensional modeling confirmed the novelty of CaHMGR with a spatial structure similar to Homo sapiens (PDB id: 1IDQ8_A). Tissue Expression analysis indicates that CaHMGR is ubiquitous albeit differentially expressed among different tissues analysed, Strong expression was recorded in the nodes and leaves and low in the roots. The present investigation confirmed that nodes are vital to terpenoid synthesis in C. asiatica. Thus, the cloning of full length CDS, characterization and structure–function analysis of HMGR gene in Centella facilitate to understand the HMGR’s functions and regulatory mechanisms involved in mevalonate pathway in C. asiatica at genetic level. Keywords Centella asiatica Triterpenoid biosynthesis Cloning CaHMGR Structure–function