Physico-chemical parameters influencing DNase activity of the cyanobacterium Spirulina platensis

Jixiang Cao, Dong Liang, Zengfu Xu, Guohua Qiu, Baojian Li, Avigad Vonshak

Research output: Contribution to journalArticlepeer-review


The effects of temperature, Mg2+, EDTA concentration and rinsing on extra- and intra-cellular DNase activity of Spirulina platensis strain SSP-14, were investigated. The results indicate that the tested strain contains very high extra- and intra-cellular DNase activity, which actually hinders the transfer of foreign gene(s) to S. platensis, a cyanobacterium with multiple economic potentials. The extracellular DNase activity could easily be removed by rinsing the cells with Zarrouk medium more than once. The intracellular DNase activity could also be inhibited by (1) removal of Mg2+, (2) maintaining EDTA concentration above 1 mmol l-1, and (3) manipulating below 0-4 °C, during all the incubation procedures. We suggest that, by using one or more of, or combining, all those experimental conditions, the chances of foreign DNA attempted to be introduced into S. platensis without being digested would be increased.

Original languageEnglish
Pages (from-to)59-63
Number of pages5
JournalMicrobiological Research
Issue number1
StatePublished - 1 Jan 2000


  • DNase
  • Extracellular nuclease
  • Spirulina platensis

ASJC Scopus subject areas

  • Microbiology


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