Encapsidates the viral DNA into characteristic twinned ('geminate') particles. Binds the genomic viral ssDNA and shuttles it into and out of the cell nucleus. The CP of bipartite geminiviruses is not required for cell-to-cell or systemic movement. Homomultimer. Binds to single-stranded and double-stranded viral DNA. Interacts (via nuclear localization signals) with host importin alpha-1a (By similarity). It is actively transported into the host cell nucleus. It may be exported out of the nucleus through a nuclear export signal for cell-to-cell movement and spread (By similarity). Belongs to the geminiviridae capsid protein family.