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  • 1
    Online Resource
    Online Resource
    Development and Application of Quantitative Detection of Cyanophages Phylogenetically Related to Cyanophage Ma-LMM01 Infecting Microcystis aeruginosa in Fresh Water
    Japanese Society of Microbial Ecology ; 2007
    In:  Microbes and Environments Vol. 22, No. 3 ( 2007), p. 207-213
    Details
    In: Microbes and Environments, Japanese Society of Microbial Ecology, Vol. 22, No. 3 ( 2007), p. 207-213
    Type of Medium: Online Resource
    ISSN: 1342-6311 , 1347-4405
    URL: Article
    DOI: 10.1264/jsme2.22.207
    Language: English
    Publisher: Japanese Society of Microbial Ecology
    Publication Date: 2007
    detail.hit.zdb_id: 2039087-7
    SSG: 12
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  • 2
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    Online Resource
    Isolation and Characterization of a Novel Single-Stranded RNA Virus Infecting the Bloom-Forming Diatom Rhizosolenia setigera
    American Society for Microbiology ; 2004
    In:  Applied and Environmental Microbiology Vol. 70, No. 2 ( 2004-02), p. 704-711
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 70, No. 2 ( 2004-02), p. 704-711
    Abstract: A novel single-stranded RNA (ssRNA) virus specifically infecting the bloom-forming diatom Rhizosolenia setigera ( R. setigera RNA virus [RsRNAV]) was isolated from Ariake Sea, Japan. Viral replication occurred within the cytoplasm, and the virus particle was icosahedral, lacked a tail, and was 32 nm in diameter on average. The major nucleic acid extracted from the RsRNAV particles was an ssRNA molecule 11.2 kb in length, although smaller RNA molecules (0.6, 1.2, and 1.5 kb) were occasionally observed. The major structural proteins of RsRNAV were 41.5, 41.0, and 29.5 kDa. Inter- and intraspecies host specificity tests revealed that RsRNAV is not only species specific but also strain specific and that its intraspecies host specificity is diverse among virus clones. The latent period of RsRNAV was 2 days, and the burst sizes were 3,100 and 1,010 viruses per host cell when viruses were inoculated into the host culture at the exponential and stationary growth phases, respectively, at 15°C under a 12-h-12-h light-dark cycle of ca. 110 μmol of photons m −2 s −1 with cool white fluorescent illumination. To our knowledge, this is the first report describing the biological properties of a virus infecting a diatom. Further studies on RsRNAV will be helpful in understanding the ecological relationship between diatoms and viruses in nature.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.70.2.704-711.2004
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2004
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 3
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    Online Resource
    Algal Viruses with Distinct Intraspecies Host Specificities Include Identical Intein Elements
    American Society for Microbiology ; 2005
    In:  Applied and Environmental Microbiology Vol. 71, No. 7 ( 2005-07), p. 3599-3607
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 71, No. 7 ( 2005-07), p. 3599-3607
    Abstract: Heterosigma akashiwo virus (HaV) is a large double-stranded DNA virus infecting the single-cell bloom-forming raphidophyte (golden brown alga) H. akashiwo . A molecular phylogenetic sequence analysis of HaV DNA polymerase showed that it forms a sister group with Phycodnaviridae algal viruses. All 10 examined HaV strains, which had distinct intraspecies host specificities, included an intein (protein intron) in their DNA polymerase genes. The 232-amino-acid inteins differed from each other by no more than a single nucleotide change. All inteins were present at the same conserved position, coding for an active-site motif, which also includes inteins in mimivirus (a very large double-stranded DNA virus of amoebae) and in several archaeal DNA polymerase genes. The HaV intein is closely related to the mimivirus intein, and both are apparently monophyletic to the archaeal inteins. These observations suggest the occurrence of horizontal transfers of inteins between viruses of different families and between archaea and viruses and reveal that viruses might be reservoirs and intermediates in horizontal transmissions of inteins. The homing endonuclease domain of the HaV intein alleles is mostly deleted. The mechanism keeping their sequences basically identical in HaV strains specific for different hosts is yet unknown. One possibility is that rapid and local changes in the HaV genome change its host specificity. This is the first report of inteins found in viruses infecting eukaryotic algae.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.71.7.3599-3607.2005
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2005
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
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  • 4
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    Previously Unknown Virus Infects Marine Diatom
    American Society for Microbiology ; 2005
    In:  Applied and Environmental Microbiology Vol. 71, No. 7 ( 2005-07), p. 3528-3535
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 71, No. 7 ( 2005-07), p. 3528-3535
    Abstract: Diatoms are a major phytoplankton group that play important roles in maintaining oxygen levels in the atmosphere and sustaining the primary nutritional production of the aquatic environment. Among diatoms, the genus Chaetoceros is one of the most abundant and widespread. Temperature, climate, salinity, nutrients, and predators were regarded as important factors controlling the abundance and population dynamics of diatoms. Here we show that a viral infection can occur in the genus Chaetoceros and should therefore be considered as a potential mortality source. Chaetoceros salsugineum nuclear inclusion virus (CsNIV) is a 38-nm icosahedral virus that replicates within the nucleus of C. salsugineum. The latent period was estimated to be between 12 and 24 h, with a burst size of 325 infectious units per host cell. CsNIV has a genome structure unlike that of other viruses that have been described. It consists of a single molecule of covalently closed circular single-stranded DNA (ssDNA; 6,005 nucleotides), as well as a segment of linear ssDNA (997 nucleotides). The linear segment is complementary to a portion of the closed circle creating a partially double-stranded genome. Sequence analysis reveals a low but significant similarity to the replicase of circoviruses that have a covalently closed circular ssDNA genome. This new host-virus system will be useful for investigating the ecological relationships between bloom-forming diatoms and other viruses in the marine system. Our study supports the view that, given the diversity and abundance of plankton, the ocean is a treasury of undiscovered viruses.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.71.7.3528-3535.2005
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2005
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
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  • 5
    Online Resource
    Online Resource
    Intraspecies Host Specificity of a Single-Stranded RNA Virus Infecting a Marine Photosynthetic Protist Is Determined at the Early Steps of Infection
    American Society for Microbiology ; 2007
    In:  Journal of Virology Vol. 81, No. 3 ( 2007-02), p. 1372-1378
    Details
    In: Journal of Virology, American Society for Microbiology, Vol. 81, No. 3 ( 2007-02), p. 1372-1378
    Abstract: Viruses are extremely abundant in seawater and are believed to be significant pathogens to photosynthetic protists (microalgae). Recently, several novel RNA viruses were found to infect marine photosynthetic protists; one of them is HcRNAV, which infects Heterocapsa circularisquama ( Dinophyceae ). There are two distinct ecotypes of HcRNAV with complementary intraspecies host ranges. Nucleotide sequence comparison between them revealed remarkable differences in the coat protein coding gene resulting in a high frequency of amino acid substitutions. However, the detailed mechanism supporting this intraspecies host specificity is still unknown. In this study, virus inoculation experiments were conducted with compatible and incompatible host-virus combinations to investigate the mechanism determining intraspecies host specificity. Cells were infected by adding a virus suspension directly to a host culture or by transfecting viral RNA into host cells by particle bombardment. Virus propagation was monitored by Northern blot analysis with a negative-strand-specific RNA probe, transmission electron microscopy, and a cell lysis assay. With compatible host-virus combinations, propagation of infectious progeny occurred regardless of the inoculation method used. When incompatible combinations were used, direct addition of a virus suspension did not even result in viral RNA replication, while in host cells transfected with viral RNA, infective progeny virus particles with a host range encoded by the imported viral RNA were propagated. This indicates that the intraspecies host specificity of HcRNAV is determined by the upstream events of virus infection. This is the first report describing the reproductive steps of an RNA virus infecting a photosynthetic protist at the molecular level.
    Type of Medium: Online Resource
    ISSN: 0022-538X , 1098-5514
    URL: Article
    DOI: 10.1128/JVI.01082-06
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2007
    detail.hit.zdb_id: 1495529-5
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  • 6
    Online Resource
    Online Resource
    Isolation and Characterization of a Cyanophage Infecting the Toxic Cyanobacterium Microcystis aeruginosa
    American Society for Microbiology ; 2006
    In:  Applied and Environmental Microbiology Vol. 72, No. 2 ( 2006-02), p. 1239-1247
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 72, No. 2 ( 2006-02), p. 1239-1247
    Abstract: We isolated a cyanophage (Ma-LMM01) that specifically infects a toxic strain of the bloom-forming cyanobacterium Microcystis aeruginosa . Transmission electron microscopy showed that the virion is composed of anisometric head and a tail complex consisting of a central tube and a contractile sheath with helical symmetry. The morphological features and the host specificity suggest that Ma-LMM01 is a member of the cyanomyovirus group. Using semi-one-step growth experiments, the latent period and burst size were estimated to be 6 to 12 h and 50 to 120 infectious units per cell, respectively. The size of the phage genome was estimated to be ca. 160 kbp using pulse-field gel electrophoresis; the nucleic acid was sensitive to DNase I, Bal31, and all 14 restriction enzymes tested, suggesting that it is a linear double-stranded DNA having a low level of methylation. Phylogenetic analyses based on the deduced amino acid sequences of two open reading frames coding for ribonucleotide reductase alpha- and beta-subunits showed that Ma-LMM01 forms a sister group with marine and freshwater cyanobacteria and is apparently distinct from T4-like phages. Phylogenetic analysis of the deduced amino acid sequence of the putative sheath protein showed that Ma-LMM01 does not form a monophyletic group with either the T4-like phages or prophages, suggesting that Ma-LMM01 is distinct from other T4-like phages that have been described despite morphological similarity. The host-phage system which we studied is expected to contribute to our understanding of the ecology of Microcystis blooms and the genetics of cyanophages, and our results suggest the phages could be used to control toxic cyanobacterial blooms.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.72.2.1239-1247.2006
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2006
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
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  • 7
    Online Resource
    Online Resource
    Comparison of Genome Sequences of Single-Stranded RNA Viruses Infecting the Bivalve-Killing Dinoflagellate Heterocapsa circularisquama
    American Society for Microbiology ; 2005
    In:  Applied and Environmental Microbiology Vol. 71, No. 12 ( 2005-12), p. 8888-8894
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 71, No. 12 ( 2005-12), p. 8888-8894
    Abstract: Heterocapsa circularisquama RNA virus (HcRNAV) has at least two ecotypes (types UA and CY) that have intraspecies host specificities which are complementary to each other. We determined the complete genomic RNA sequence of two typical HcRNAV strains, HcRNAV34 and HcRNAV109, one of each ecotype. The nucleotide sequences of the viruses were 97.0% similar, and each had two open reading frames (ORFs), ORF-1 coding for a putative polyprotein having protease and RNA-dependent RNA polymerase (RdRp) domains and ORF-2 encoding a single major capsid protein. Phylogenetic analysis of the RdRp amino acid sequence suggested that HcRNAV belongs to a new previously unrecognized virus group. Four regions in ORF-2 had amino acid substitutions when HcRNAV34 was compared to HcRNAV109. We used a reverse transcription-nested PCR system to amplify the corresponding regions and also examined RNAs purified from six other HcRNAV strains with known host ranges. We also looked at natural marine sediment samples. Phylogenetic dendrograms for the amplicons correlated with the intraspecies host specificities of the test virus strains. The cloned sequences found in sediment also exhibited considerable similarities to either the UA-type or CY-type sequence. The tertiary structure of the capsid proteins predicted using computer modeling indicated that many of the amino acid substitutions were located in regions on the outside of the viral capsid proteins. This strongly suggests that the intraspecies host specificity of HcRNAV is determined by nanostructures on the virus surface that may affect binding to suitable host cells. Our study shows that capsid alterations can change the phytoplankton-virus (host-parasite) interactions in marine systems.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.71.12.8888-8894.2005
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2005
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 8
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    Crystallization and preliminary X-ray analysis of a marine diatom-infecting single-stranded RNA virus
    International Union of Crystallography (IUCr) ; 2010
    In:  Acta Crystallographica Section F Structural Biology and Crystallization Communications Vol. 66, No. 11 ( 2010-11-01), p. 1449-1452
    Details
    In: Acta Crystallographica Section F Structural Biology and Crystallization Communications, International Union of Crystallography (IUCr), Vol. 66, No. 11 ( 2010-11-01), p. 1449-1452
    Type of Medium: Online Resource
    ISSN: 1744-3091
    URL: Article
    DOI: 10.1107/S1744309110032422
    Language: Unknown
    Publisher: International Union of Crystallography (IUCr)
    Publication Date: 2010
    detail.hit.zdb_id: 2175956-X
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  • 9
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    Online Resource
    Diverse Responses of the Bivalve-Killing Dinoflagellate Heterocapsa circularisquama to Infection by a Single-Stranded RNA Virus
    American Society for Microbiology ; 2008
    In:  Applied and Environmental Microbiology Vol. 74, No. 10 ( 2008-05-15), p. 3105-3111
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 74, No. 10 ( 2008-05-15), p. 3105-3111
    Abstract: Viruses are believed to be significant pathogens for phytoplankton. Usually, they infect a single algal species, and often their infection is highly strain specific. However, the detailed molecular background of the strain specificity and its ecological significance have not been sufficiently understood. Here, we investigated the temporal changes in viral RNA accumulation and virus-induced cell lysis using a bloom-forming dinoflagellate Heterocapsa circularisquama and its single-stranded RNA virus, HcRNAV. We observed at least three host response patterns to virus inoculation: sensitive, resistant, and delayed lysis. In the sensitive response, the host cell culture was permissive for viral RNA replication and apparent cell lysis was observed; in contrast, resistant cell culture was nonpermissive for viral RNA replication and not lysed. In the delayed-lysis response, although viral RNA replication occurred, virus-induced cell lysis was faint and remarkably delayed. In addition, the number of infectious virus particles released to the culture supernatant at 12 days postinoculation was comparable to that of the sensitive strain. By further analysis, a few strains were characterized as variants of the delayed-lysis strain. These observations indicate that the response of H. circularisquama to HcRNAV infection is highly diverse.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.02190-07
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2008
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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  • 10
    Online Resource
    Online Resource
    Isolation and Characterization of a Single-Stranded RNA Virus Infecting the Marine Planktonic Diatom Chaetoceros tenuissimus Meunier
    American Society for Microbiology ; 2008
    In:  Applied and Environmental Microbiology Vol. 74, No. 13 ( 2008-07), p. 4022-4027
    Details
    In: Applied and Environmental Microbiology, American Society for Microbiology, Vol. 74, No. 13 ( 2008-07), p. 4022-4027
    Abstract: Diatoms are important components of the biological community and food web in the aquatic environment. Here, we report the characteristics of a single-stranded RNA (ssRNA) virus (CtenRNAV01) that infects the marine diatom Chaetoceros tenuissimus Meunier (Bacillariophyceae). The ca. 31-nm virus particle is icosahedral and lacks a tail. CtenRNAV01 forms crystalline arrays occupying most of the infected host's cytoplasm. By growth experiments, the lytic cycle and the burst size were estimated to be 〈 24 h and ∼1 × 10 4 infectious units per host cell, respectively. Stationary-phase C. tenuissimus cultures were shown to be more sensitive to CtenRNAV01 than logarithmic-phase cultures. The most noticeable feature of this virus is its exceptionally high yields of ∼10 10 infectious units ml −1 ; this is much higher than those of any other algal viruses previously characterized. CtenRNAV01 has two molecules of ssRNA of approximately 8.9 and 4.3 kb and three major proteins (33.5, 31.5, and 30.0 kDa). Sequencing of the total viral genome has produced only one large contig [9,431 bases excluding the poly(A) tail], suggesting considerable overlapping between the two RNA molecules. The monophyly of CtenRNAV01 compared to another diatom-infecting virus, Rhizosolenia setigera RNA virus, was strongly supported in a maximum likelihood phylogenetic tree constructed based on the concatenated amino acid sequences of the RNA-dependent RNA polymerase domains. Although further analysis is required to determine the detailed classification and nomenclature of this virus, these data strongly suggest the existence of a diatom-infecting ssRNA virus group in natural waters.
    Type of Medium: Online Resource
    ISSN: 0099-2240 , 1098-5336
    URL: Article
    DOI: 10.1128/AEM.00509-08
    RVK:
    WA 15000
    Language: English
    Publisher: American Society for Microbiology
    Publication Date: 2008
    detail.hit.zdb_id: 223011-2
    detail.hit.zdb_id: 1478346-0
    SSG: 12
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