RING finger, HC subclass, found in Saccharomyces cerevisiae ubiquitin ligase for SUMO conjugates protein 1 (ULS1) and similar proteins
ULS1, also called role in silencing protein 1, is an ATP-dependent helicase involved in mating type switching and in silencing interference through its interaction with the silencing regulator SIR4. It cooperates with UBC4 and UBC5 to mediate ubiquitination of SUMO conjugates. ULS1 contains a typical C3HC4-type RING-HC finger.
Comment:C3HC4-type RING-HC finger consensus motif: C-X2-C-X(9-39)-C-X(1-3)-H-X(2-3)-C-X2-C-X(4-48)-C-X2-C, where X is any amino acid and the number of X residues varies in different fingers
Comment:A RING finger typically binds two zinc atoms, with its Cys and/or His side chains in a unique "cross-brace" arrangement.