RRC ID 21097
Author Yoshida T, Nagasaki K, Takashima Y, Shirai Y, Tomaru Y, Takao Y, Sakamoto S, Hiroishi S, Ogata H.
Title Ma-LMM01 infecting toxic Microcystis aeruginosa illuminates diverse cyanophage genome strategies.
Journal J Bacteriol
Abstract Cyanobacteria and their phages are significant microbial components of the freshwater and marine environments. We identified a lytic phage, Ma-LMM01, infecting Microcystis aeruginosa, a cyanobacterium that forms toxic blooms on the surfaces of freshwater lakes. Here, we describe the first sequenced freshwater cyanomyovirus genome of Ma-LMM01. The linear, circularly permuted, and terminally redundant genome has 162,109 bp and contains 184 predicted protein-coding genes and two tRNA genes. The genome exhibits no colinearity with previously sequenced genomes of cyanomyoviruses or other Myoviridae. The majority of the predicted genes have no detectable homologues in the databases. These findings indicate that Ma-LMM01 is a member of a new lineage of the Myoviridae family. The genome lacks homologues for the photosynthetic genes that are prevalent in marine cyanophages. However, it has a homologue of nblA, which is essential for the degradation of the major cyanobacteria light-harvesting complex, the phycobilisomes. The genome codes for a site-specific recombinase and two prophage antirepressors, suggesting that it has the capacity to integrate into the host genome. Ma-LMM01 possesses six genes, including three coding for transposases, that are highly similar to homologues found in cyanobacteria, suggesting that recent gene transfers have occurred between Ma-LMM01 and its host. We propose that the Ma-LMM01 NblA homologue possibly reduces the absorption of excess light energy and confers benefits to the phage living in surface waters. This phage genome study suggests that light is central in the phage-cyanobacterium relationships where the viruses use diverse genetic strategies to control their host's photosynthesis.
Volume 190(5)
Pages 1762-72
Published 2008-3-1
DOI 10.1128/JB.01534-07
PII JB.01534-07
PMID 18065537
PMC PMC2258655
MeSH Amino Acid Sequence Bacteriophages / genetics* Bacteriophages / growth & development Computational Biology Databases, Genetic Fresh Water / microbiology Fresh Water / virology Genome, Viral* Host-Pathogen Interactions Microcystis / virology* Models, Genetic Molecular Sequence Data Open Reading Frames Sequence Analysis, DNA Sequence Homology, Amino Acid Transcription, Genetic
IF 3.006
Times Cited 63
Algae NIES-298