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RanBP2-type zinc finger The zf-RanBP2 domain represents a new superfamily of C2C2-type zinc finger motif, which is characterized by the conserved sequence pattern W-X-C-X(2,4)-C-X(3)-N-X(6)-C-X(2)-C. They fold into a structure composed of two orthogonal beta-hairpin strands that sandwich a single Zn2+ ion coordinated with four cysteine residues. zf-RanBP2 domains are mainly found in eukaryotic proteins and some exist in bacteria and archaea. According to different binding partners, the superfamily can be classified into several families. For instance, the E3 SUMO-protein ligase RanBP2-like family binds Ran, the nuclear protein localization protein 4 homolog (NPL4)-like family binds ubiquitin, and the zinc finger Ran-binding domain-containing protein 2 (ZRANB2)-like family binds single-stranded RNA (ssRNA). Most of superfamily members contain one copy of zf-RanBP2, but some contain several zf-RanBP2 domains.
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