Is predicted to encode a protein with the following domains: 26S proteasome subunit RPN7; Proteasome component (PCI) domain; 26S proteasome regulatory subunit Rpn7/COP9 signalosome complex subunit 1; Winged helix DNA-binding domain superfamily; PCI domain; and COP9 signalosome complex subunit 1. Is an ortholog of C. elegans csn-1. In C. elegans, csn-1 is involved in cell cycle switching and regulation of oogenesis.