Potassium ion channels of chlorella viruses cause rapid depolarization of host cells during infection

Florian Frohns, Anja Käsmann, Detlef Kramer, Britta Schäfer, Mario Mehmel, Ming Kang, James L. Van Etten, Sabrina Gazzarrini, Anna Moroni, Gerhard Thiel

Research output: Contribution to journalArticlepeer-review

39 Scopus citations


Previous studies have established that chlorella viruses encode K + channels with different structural and functional properties. In the current study, we exploit the different sensitivities of these channels to Cs+ to determine if the membrane depolarization observed during virus infection is caused by the activities of these channels. Infection of Chlorella NC64A with four viruses caused rapid membrane depolarization of similar amplitudes, but with different kinetics. Depolarization was fastest after infection with virus SC-1A (half time [t1/2], about 9 min) and slowest with virus NY-2A (t1/2, about 12 min). Cs+ inhibited membrane depolarization only in viruses that encode a Cs +-sensitive K+ channel. Collectively, the results indicate that membrane depolarization is an early event in chlorella virus-host interactions and that it is correlated with viral-channel activity. This suggestion was supported by investigations of thin sections of Chlorella cells, which show that channel blockers inhibit virus DNA release into the host cell. Together, the data indicate that the channel is probably packaged in the virion, presumably in its internal membrane. We hypothesize that fusion of the virus internal membrane with the host plasma membrane results in an increase in K + conductance and membrane depolarization; this depolarization lowers the energy barrier for DNA release into the host.

Original languageEnglish (US)
Pages (from-to)2437-2444
Number of pages8
JournalJournal of virology
Issue number5
StatePublished - Mar 2006
Externally publishedYes

ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology


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