| Primary Identifier | IPR038666 | Type | Homologous_superfamily |
| Short Name | SSP1_head-tail_sf |
| description | This entry describes the head-tail adaptor protein of bacteriophage SPP1and related proteins in other bacteriophage and prophage regions of bacterial genomes. Homologues are also found in Gene Transfer Agents (GTA) [], including ORFg7 (RCAP_rcc01689) of the GTA of Rhodobacter capsulatus (Rhodopseudomonas capsulata) [].In bacteriophage SPP1, the gp16 protein functions as a stopper, locking the viral DNA into the capsid. When the tail attachment binds to the entry receptor, gp16 opens by a diaphragm-like motion, allowing the genome to exit the capsid through the tail tube to the host cell. During virion assembly, gp16 functions as a docking platform to which the preassembled tail binds [].The SPP1 head-to-tail connector is composed of cyclical dodecamers of the portal protein gp6 and of the 2 head completion proteins gp15 and gp16 []. |
