Non-enveloped, head-tail structure. The icosahedral head is about 60 nm, with a T=7 dextro symmetry , composed of 72 capsomers. The tail is contractile, about 135×18 nm, has 6 short kinked fibers.


Linear, dsDNA genome of about 34 kb, encoding for approximately 45 proteins. The genome has cohesive ends (cos sites).


Genes are transcribed by operons.



  1. Adsorption: the phage attaches to the target cell through its tail fibers.
  2. Ejection of the viral DNA into host cell cytoplasm by contraction of the tail sheath.
  3. Transcription and translation of early genes.
  4. Synthesis of linear concatemers copies of viral DNA by rolling circle. Transcription and translation of late genes.
  5. Assembly of an empty procapsid and packaging of the genome.
  6. Viral tail fibers assembly and viral tail assembly.
  7. Mature virions are released from the cell by lysis.

Matching UniProtKB/Swiss-Prot entries

68 entries grouped by strain (browse by keywords)

39 entries

Escherichia phage P2 (Bacteriophage P2) reference strain

Select_all Deselect_all  
ANTIH_BPP2Putative antiholin (Protein lysA)
BPD_BPP2Probable baseplate hub protein (Gene D protein) (GpD)
BPI_BPP2Baseplate protein I (Gene I protein) (GpI)
BPJ_BPP2Baseplate protein J (Gene J protein) (GpJ)
BPW_BPP2Baseplate protein W (Gene W protein) (GpW)
BPX_BPP2Baseplate protein X (Gene X protein) (GpX)
CAPSD_BPP2Capsid proteins (GpN)
ENLYS_BPP2Endolysin (EC 4.2.2.n2) (Lysis protein) (Lysozyme) (Protein gpK) ...
FIBH_BPP2Probable tail fiber protein (GpH)
PORTL_BPP2Probable portal protein (GpQ)
RPC_BPP2Repressor protein C
SCAF_BPP2Capsid assembly scaffolding protein (Gene product O) (GpO) (Head morphogenesis ...
SPAN1_BPP2Probable spanin, inner membrane subunit (i-spanin) (Protein lysB)
SPAN2_BPP2Probable spanin, outer lipoprotein subunit (Protein lysC)
SPIKE_BPP2Spike protein (Baseplate assembly protein gpV) (Gene V protein) (GpV)
TAPFS_BPP2Tail assembly protein E' (Gene product E') (gpE') (Tail assembly chaperone) ...
TAP_BPP2Tail assembly protein E (Gene product E) (gpE) (Tail assembly chaperone) (TAC)
TFA_BPP2Probable tail fiber assembly protein (GpG)
TMP_BPP2Probable tape measure protein (TMP) (Gene product T) (gpT)
TSP_BPP2Tail sheath protein (TSP) (Major tail sheath protein) (Protein FI)
TUBE_BPP2Tail tube protein (TTP) (Protein FII)
VCOX_BPP2Regulatory protein cox
VINT_BPP2Integrase (EC 2.7.7.-) (EC 3.1.-.-)
VOGR_BPP2Late control protein ogr
VOLD_BPP2Overcoming lysogenization defect protein
VPA_BPP2Replication gene A protein (EC 3.1.-.-) (GpA)
VPB_BPP2Replication gene B protein (GpB)
VPL_BPP2Head completion/stabilization protein (GpL)
VPM_BPP2Terminase, endonuclease subunit (GpM)
VPP_BPP2Terminase, ATPase subunit (GpP)
VPR_BPP2Tail completion protein R (GpR)
VPS_BPP2Tail completion protein S (GpS)
YO80_BPP2Uncharacterized 8.3 kDa protein in GpA 5'region (ORF1)
YO81_BPP2Uncharacterized 11.3 kDa protein in GpA 5'region (ORF2)
YO82_BPP2Uncharacterized 8.2 kDa protein in gpA 5'region (ORF3)
YO83_BPP2Uncharacterized 10.2 kDa protein in GpA 5'region (ORF4)
YO91_BPP2Uncharacterized 12.9 kDa protein in GpA 3'region (ORF5)
YSV_BPP2Uncharacterized 30.4 kDa protein in S-V intergenic region (ORF-30)

16 entries

Escherichia phage 186 (Bacteriophage 186) reference strain

Select_all Deselect_all  
BPD_BP186Probable baseplate hub protein (Gene D protein) (GpD) (Late control gene D ...
CP69_BP186Uncharacterized 8.4 kDa protein
CP79_BP186Uncharacterized 8.8 kDa protein in GpA 5'region
CP80_BP186Uncharacterized 8.5 kDa protein in gpA 5'region
CP81_BP186Uncharacterized exonuclease CP81 (EC 3.1.-.-)
CP83_BP186Uncharacterized 10.4 kDa protein in GpA 5'region
CP84_BP186Uncharacterized 37.8 kDa protein in gpa 5'region
RPC1_BP186Repressor protein CI
RPC2_BP186Regulatory protein CII
TUM_BP186SOS operon TUM protein (ORF95 protein) (Protein TUM95)
VAPL_BP186Protein apl
VDHR_BP186Protein dhr
VFIL_BP186Protein fil
VINT_BP186Integrase (EC 2.7.7.-) (EC 3.1.-.-)
VPA_BP186Replication gene A protein (EC 3.1.-.-) (GpA)
VPB_BP186Late control gene B protein (GpB)

13 entries

Enterobacteria phage P4 (Bacteriophage P4) reference strain

Select_all Deselect_all  
GOP_BPP4Protein gop
PRIM_BPP4Putative P4-specific DNA primase (EC 2.7.7.-) (EC
RCII_BPP4Protein cII
VASH_BPP4Protein ash (Protein cI)
VBET_BPP4Protein beta
VDEL_BPP4Transactivation protein
VEPS_BPP4Derepression protein
VINT_BPP4Integrase (EC 2.7.7.-) (EC 3.1.-.-)
VPSU_BPP4Polarity suppression protein (Amber mutation-suppressing protein)
VSID_BPP4Glycoprotein 3 (Capsid size determination protein)
Y9K_BPP4Uncharacterized protein ORF88 (Putative DNA-binding protein)
YQ54_BPP4Uncharacterized protein ORF151
YQ55_BPP4Uncharacterized protein ORF106