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Complete nucleotide sequence of the mycoplasma virus P1 genome
1Department of Comparative Medicine, University of Alabama at Birmingham, 35294, USA.
Abstract:
Mycoplasma virus P1 is one of only four viruses isolated from the genus Mycoplasma. The host for P1, Mycoplasma pulmonis, possesses complex, phase-variable restriction and modification enzymes and the Vsa family of phase-variable surface proteins. The ability of P1 virus to infect host cells is influenced by these phase-variable systems, rendering P1 a valuable tool for assessing host properties. The double-stranded P1 DNA genome was sequenced (11,660 bp) and 11 ORFs were identified. The predicted P1 DNA polymerase is similar to that of phages that are known to have terminal protein (TP) attached to the 5' end of their genome, consistent with previous studies indicating that P1 DNA has covalently attached TP. Most of the other predicted P1 proteins have little sequence similarity to known proteins, and P1 virus is unrelated to the other mycoplasma virus, MAV1, for which the genome sequence is known. One of the predicted P1 proteins, the ORF 8 gene product, contains a repetitive collagen-like motif characteristic of some bacteriophage tail fiber proteins and is a candidate for interacting with the Vsa proteins.
Insights
Mycoplasma virus P1, a tool for studying host properties, has had its genome sequenced. Its DNA polymerase suggests terminal protein attachment, and ORF8 may interact with host Vsa proteins.
Area of Science:
- Virology
- Molecular Biology
- Genomics
Background:
- Mycoplasma virus P1 infects Mycoplasma pulmonis, a host with complex phase-variable systems.
- These host systems influence viral infection and offer a way to study host properties.
- P1 is one of only four known viruses from the genus Mycoplasma.
Purpose of the Study:
- To sequence the genome of Mycoplasma virus P1.
- To identify open reading frames (ORFs) and predict protein functions.
- To investigate potential interactions between P1 proteins and host cell surface proteins.
Main Methods:
- Whole-genome sequencing of Mycoplasma virus P1 (11,660 bp).
- Bioinformatic analysis to identify 11 ORFs.
- Sequence similarity searches to predict protein functions and evolutionary relationships.
Main Results:
- The P1 genome sequence was determined, revealing 11 ORFs.
- The predicted P1 DNA polymerase shows similarity to phages with terminal protein (TP) attachment.
- ORF8 encodes a protein with a collagen-like motif, a candidate for Vsa protein interaction.
Conclusions:
- Mycoplasma virus P1 genome sequencing provides insights into its replication and host interaction mechanisms.
- P1 is evolutionarily distinct from other sequenced mycoplasma viruses like MAV1.
- The ORF8 protein is a potential key player in P1's interaction with Mycoplasma pulmonis Vsa proteins.