4gx7 is a 6 chain structure with sequence from Vibrio cholerae 12129(1). Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
↑ Olson R, Gouaux E. Crystal structure of the Vibrio cholerae cytolysin (VCC) pro-toxin and its assembly into a heptameric transmembrane pore. J Mol Biol. 2005 Jul 29;350(5):997-1016. PMID:15978620 doi:10.1016/j.jmb.2005.05.045