Original Research

Journal of Plant Biology

, Volume 52, Issue 6, pp 524-532

Improvement of DNA/Metal Particle Adsorption in Tungsten-Based Biolistic Bombardment; Alkaline pH is Necessary for DNA Adsorption and Suppression of DNA Degradation

  • Yuya YoshimitsuAffiliated withDepartment of Agricultural Sciences and Natural Resources, Kagoshima University
  • , Kiwamu TanakaAffiliated withDepartment of Agricultural Sciences and Natural Resources, Kagoshima University
  • , Takashi TagawaAffiliated withDepartment of Biochemical Science and Technology, Kagoshima University
  • , Yasushi NakamuraAffiliated withDepartment of Food Sciences and Nutritional Health, Kyoto Prefectural University
  • , Tomoaki MatsuoAffiliated withDepartment of Biochemical Science and Technology, Kagoshima University
  • , Shigehisa OkamotoAffiliated withDepartment of Agricultural Sciences and Natural Resources, Kagoshima University Email author 

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Abstract

Tungsten particles have long been used as microcarriers in biolistic bombardment because of their cost-effectiveness compared to alternative gold particles—even if the former have several drawbacks, including their DNA-degrading activity. We characterized tungsten-induced DNA degradation to assess the value of this metal particle and to improve tungsten-based biolistic bombardment. Alkaline pH, low temperature, and high salt concentration were found to diminish tungsten-induced DNA breakdown. The pH was the most influential factor in this phenomenon, both in aqueous solutions and on the particles. Furthermore, alkaline pH greater than 9.4 of an adsorption mixture was found to be essential for DNA binding to metal particles. Based on these findings, we propose a new formula of DNA/tungsten adsorption by using TE buffers that keep alkaline pH (>9.4) of the mixture, in which tungsten-bound plasmid DNA cleavage was suppressed to half the level of that in the conventional DNA-binding condition.

Keywords

Biolistic bombardment Tungsten particle Alkaline pH DNA degradation DNA adsorption