1xok is a 4 chain structure with sequence from Alfalfa mosaic virus (strain YSMV). Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
CAPSD_AMVYS Capsid protein. Binds to the to the 3' end of the nonpolyadenylated viral RNA and is involved in viral RNA translation initiation. Probably binds RNA and plays a role in packaging (By similarity).