TY - JOUR

T1 - Genome of the Acidianus bottle-shaped virus and insights into the replication and packaging mechanisms

AU - Peng, Xu

AU - Basta, Tamara

AU - Häring, Monika

AU - Garrett, Roger A

AU - Prangishvili, David

N1 - Keywords: Acidianus; Amino Acid Sequence; Archaeal Viruses; Base Sequence; DNA, Viral; Genome, Viral; Molecular Sequence Data; Nucleic Acid Conformation; RNA, Viral; Sequence Homology, Amino Acid; Virus Assembly; Virus Replication

PY - 2007

Y1 - 2007

N2 - The Acidianus bottle-shaped virus, ABV, infects strains of the hyperthermophilic archaeal genus Acidianus and is morphologically distinct from all other known viruses. Its genome consists of linear double-stranded DNA, containing 23,814 bp with a G+C content of 35%, and it exhibits a 590-bp inverted terminal repeat. Of the 57 predicted ORFs, only three produced significant matches in public sequence databases with genes encoding a glycosyltransferase, a thymidylate kinase and a protein-primed DNA polymerase. Moreover, only one homologous gene is shared with other sequenced crenarchaeal viruses. The results confirm the unique nature of the ABV virus, and support its assignment to the newly proposed viral family the Ampullaviridae. Exceptionally, one region at the end of the linear genome of ABV is similar in both gene content and organization to corresponding regions in the genomes of the bacteriophage varphi29 and the human adenovirus. The region contains the genes for a putative protein-primed DNA polymerase, and a small putative RNA with a predicted secondary structure closely similar to that of the prohead RNA of bacteriophage varphi29. The apparent similarities in the putative mechanisms of DNA replication and packaging of ABV to those of bacterial and eukaryal viruses are most consistent with the concept of a primordial gene pool as a source of viral genes.

AB - The Acidianus bottle-shaped virus, ABV, infects strains of the hyperthermophilic archaeal genus Acidianus and is morphologically distinct from all other known viruses. Its genome consists of linear double-stranded DNA, containing 23,814 bp with a G+C content of 35%, and it exhibits a 590-bp inverted terminal repeat. Of the 57 predicted ORFs, only three produced significant matches in public sequence databases with genes encoding a glycosyltransferase, a thymidylate kinase and a protein-primed DNA polymerase. Moreover, only one homologous gene is shared with other sequenced crenarchaeal viruses. The results confirm the unique nature of the ABV virus, and support its assignment to the newly proposed viral family the Ampullaviridae. Exceptionally, one region at the end of the linear genome of ABV is similar in both gene content and organization to corresponding regions in the genomes of the bacteriophage varphi29 and the human adenovirus. The region contains the genes for a putative protein-primed DNA polymerase, and a small putative RNA with a predicted secondary structure closely similar to that of the prohead RNA of bacteriophage varphi29. The apparent similarities in the putative mechanisms of DNA replication and packaging of ABV to those of bacterial and eukaryal viruses are most consistent with the concept of a primordial gene pool as a source of viral genes.

U2 - 10.1016/j.virol.2007.03.005

DO - 10.1016/j.virol.2007.03.005

M3 - Journal article

C2 - 17412384

VL - 364

SP - 237

EP - 243

JO - Virology

JF - Virology

SN - 0042-6822

IS - 1

ER -