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