This domain can be found in the N terminus of the FusB, FusC, and FusD proteins from Staphylococcus aureus. They are elongation factor G (EF-G) binding proteins that are linked to the fusidic acid (FA) resistance in S. aureus [4,5]. The FusB proteins are two-domain metalloproteins, and this N-terminal domain forms a four-helical bundle whose helices help to stabilise the conformation of the treble-clef zinc-finger in the C-terminal domain [2]. FA is an antibiotic that binds to EF-G, preventing its release from the ribosome, thus stalling bacterial protein synthesis. The FusB proteins provide FA resistance by preventing formation or facilitating dissociation of the FA-locked EF-G-ribosome complex during elongation and ribosome recycling [3].

1: Cloning, sequencing and characterisation of a Listeria monocytogenes gene encoding a fibronectin-binding protein. Gilot P, Jossin Y, Content J; J Med Microbiol 2000;49:887-896. PMID:11023185

2: Ribosome clearance by FusB-type proteins mediates resistance to the antibiotic fusidic acid. Cox G, Thompson GS, Jenkins HT, Peske F, Savelsbergh A, Rodnina MV, Wintermeyer W, Homans SW, Edwards TA, O'Neill AJ; Proc Natl Acad Sci U S A. 2012;109:2102-2107. PMID:22308410

3: Structure and function of FusB: an elongation factor G-binding fusidic acid resistance protein active in ribosomal translocation and recycling. Guo X, Peisker K, Backbro K, Chen Y, Koripella RK, Mandava CS, Sanyal S, Selmer M; Open Biol. 2012;2:120016. PMID:22645663

4: A novel staphylococcal cassette chromosomal element, SCCfusC, carrying fusC and speG in fusidic acid-resistant methicillin-resistant Staphylococcus aureus. Lin YT, Tsai JC, Chen HJ, Hung WC, Hsueh PR, Teng LJ; Antimicrob Agents Chemother. 2014;58:1224-1227. PMID:24277045

5: Characterization of global patterns and the genetics of fusidic acid resistance. Farrell DJ, Castanheira M, Chopra I; Clin Infect Dis. 2011;52:S487-S492. PMID:21546625