Non-enveloped, head-tail structure. The head is about 60 nm in diameter. The tail is non-contractile and very flexible, about 151 nm in length and 8 nm in width, with 4 short kinked terminal fibers.


Linear, dsDNA genome of about 50 kb, terminally redundant and circularly permuted, containing about 80 genes.




  1. The phage attaches to the target cell adhesion receptor FhuA through its tail fibers.
  2. Ejection of the viral DNA into host cell cytoplasm by long flexible tail ejection system.
  3. Transcription and translation of early genes.
  4. Replication of genomic DNA, formation of viral genome concatemers.
  5. Transcription and translation of late genes
  6. Assembly of an empty procapsid and packaging of the genome through a headful mechanism.
  7. Viral tail fibers assembly and viral tail assembly.
  8. Mature virions are released from the cell by lysis.

Matching UniProtKB/Swiss-Prot entries

5 entries grouped by strain (browse by keywords)

5 entries

Escherichia phage T1 (Bacteriophage T1) reference strain

SPANU_BPT1 U-spanin (Gene product 11) (Unimolecular spanin) (gp11)
HOLIN_BPT1 Holin (Pinholin)
ENLYS_BPT1 SAR-endolysin (EC (Endolysin) (Lysis protein) (Lysozyme) (Muramidase)
FIBER_BPT1 Probable tail fiber protein (Gene product 26) (Gp26)
TMP_BPT1 Tape measure protein (TMP) (Gene product 38) (gp38)