Response 5-phosphomevalonate Kinase Enzymes to Low Doses of Gamma Radiation and Its Related to the Production of Terpenoids Indole Alkaloids from Catharanthus rouses

Document Type : Original Article

Authors

Natural Products Research Department (Biotechnology Branch), National Center for Radiation Research and Technology (NCRRT), Egyptian Atomic Energy Authority (EAEA), Cairo, Egypt

Abstract

GAMMA rays effect, on different dose levels on the production of ajmalicine as well as 5-phosphomevalonate kinase enzyme activety, was studied in Catharanthus roseus cell suspension cultures. The seedlings were taken from the young leaf puds and grown on MS solid medium for 7 weeks. Calli individual serially sub cultured by transfing to maintenance medium consisting of Gamborg’s B5 medium. Cell suspensions were exposed to gamma rays after 4 weeks at dose levels of 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5 and 8Gy. Ajmalicine quantities were analyzed on VIS–spectrophotometer; also, the 5-phosphomevalonate kinase enzyme was particularly purified by ultrafiltration and activety analayzed, in addition, native PAGE electrophoresis was determined. 5-phosphomevalonate kinase enzyme bands and ajmalicine accumulation quantities were changed after the exposure to low doses from 1 to 6Gy, but the higher doses were lethal. The appropriated doses to activety of 5-phosphomevalonate kinase enzyme and Ajmalicine production were from 1 to 5Gy. Other dose levels (5.5 and 6Gy) did not affect on the 5-phosphomevalonate kinase enzyme activety and Ajmalicine production.

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