Genomic structure and RNA polymerase activity in Leishmania virus.

Abstract:

:Viral particles infecting some stocks of the protozoan parasite Leishmania braziliensis subsp. guyanensis contain a double-stranded RNA genome of ca. 5 kbp and are associated with an RNA-dependent RNA polymerase which synthesizes in vitro double-stranded and single-stranded, genome-length transcripts. The majority of viral transcripts are single-stranded and templated from one genomic strand. The putative replicase generates double-stranded RNA by synthesizing the opposite strand on a preexisting RNA template. These data are compatible with a replicative cycle proposed for the yeast viruses. Purification of the Leishmania virus on CsCl yields virus without double-strand synthesis activity, while this activity is consistently present in unpurified virus and in particles from sucrose gradients. The deficiency in double-strand synthesis in CsCl-derived virions correlates with the accessibility of the viral polymerase and genomic RNA to exogenously added enzymes, indicative of a structural modification of the viral capsid.

journal_name

J Virol

journal_title

Journal of virology

authors

Widmer G,Patterson JL

doi

10.1128/JVI.65.8.4211-4215.1991

subject

Has Abstract

pub_date

1991-08-01 00:00:00

pages

4211-5

issue

8

eissn

0022-538X

issn

1098-5514

journal_volume

65

pub_type

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