Baseplate hub protein pb3

UniProtKB accession:  Q6QGE9

Grouped By:  Matching UniProtKB accession

UniProtKB description:  Forms the simplified baseplate, together with the p132 collar protein, the baseplate tube protein p140 and distal tail protein pb9. Closes the tail tube and, upon infection, opens to form a channel thereby anchoring the tube to the outer membrane. These changes allow the tape measure protein pb2 to be expelled and phage DNA to be transferred to the host. Also forms the start of the central straight fiber, which is continued with the straight fiber protein pb4.