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

Abstract:

: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 [t(1/2)], about 9 min) and slowest with virus NY-2A (t(1/2), 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.

journal_name

J Virol

journal_title

Journal of virology

authors

Frohns F,Käsmann A,Kramer D,Schäfer B,Mehmel M,Kang M,Van Etten JL,Gazzarrini S,Moroni A,Thiel G

doi

10.1128/JVI.80.5.2437-2444.2006

subject

Has Abstract

pub_date

2006-03-01 00:00:00

pages

2437-44

issue

5

eissn

0022-538X

issn

1098-5514

pii

80/5/2437

journal_volume

80

pub_type

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