There are five or more proteins in the capsid: gp8 (the major capsid protein); gp6, gp7 and gp8 (minor capsid proteins); and gp3 which acts as the initial host binding protein.
M13 is a filamentous bacteriophage composed of circular single stranded DNA (ssDNA) which is 6407 nucleotides long encapsulated in approximately 2700 copies of the major coat protein P8, and capped with 5 copies of two different minor coat proteins (P9, P6, P3) on the ends.
These bacteriophages are flexible rods, about one to two micrometres long and six nm in diameter, with a helical shell of protein subunits surrounding a DNA core.
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