Applied Biochemistry and Biotechnology

, Volume 97, Issue 2, pp 135–145 | Cite as

Overexpression in Catharanthus roseus hairy roots of a truncated hamster 3-hydroxy-3-methylglutaryl-CoA reductase gene

  • Teresa Ayora-Talavera
  • Joseph Chappell
  • Edmundo Lozoya-Gloria
  • Victor M. Loyola-Vargas


Catharanthus roseus (L.) G. Don hairy roots harboring hamster 3-hydroxy-3-methylglutaryl-CoA reductase (HMGR) (EC cDNA without membrane-binding domain were evaluated by quantifying the levels of sterols and some indol-alkaloids. Clone 236, with the highest hybridization signal, had the lowest soluble and microsomal HMGR activity and produced more ajmalicine and catharanthine than the control but had reduced campesterol concentration. Clone 19, with low hybridization signal, had high soluble HMGR activity and produced high levels of campesterol and five to seven times more serpentine than the control but a low level of ajmalicine and no accumulation of catharanthine. These results suggest a possible role for HMGR in indole alkaloid biosynthesis and a possible cosuppression of both the endogenous and foreign HMGR genes in clone 236.

Index Entries

Alkaloids Catharanthus roseus hairy roots 3-hydroxy-3-methylglutaryl-CoA reductase 


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Copyright information

© Humana Press Inc. 2002

Authors and Affiliations

  • Teresa Ayora-Talavera
    • 1
    • 4
  • Joseph Chappell
    • 2
  • Edmundo Lozoya-Gloria
    • 3
  • Victor M. Loyola-Vargas
    • 1
  1. 1.Unidad de Bioquímica y Biología Molecular de PlantasCentro de Investigación Científica de YucatánMérida YucatánMéxico
  2. 2.Plant Physiology/Biochemistry/Molecular Biology Program, Agronomy DepartmentUniversity of KentuckyLexington
  3. 3.Departmento de Ingeniería GenéticaCINVESTAV-IPN, Unidad IrapuatoIrapuato, Gto.México
  4. 4.Departmento de Biotecnología y BioingenieríaCINVESTAV-IPN, Unidad MéxicoDF, México

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