The YebF-like protein family appears to be a group of colicin immunity proteins. As well as YebF the family includes cmi, the colicin M immunity protein [1]. This domain family is found in bacteria, and is approximately 80 amino acids in length. The alignment contains two conserved cysteine residues that form a disulphide bond in the solved structure [3].

1: Extracellular accumulation of recombinant proteins fused to the carrier protein YebF in Escherichia coli. Zhang G, Brokx S, Weiner JH; Nat Biotechnol. 2006;24:100-104. PMID:16369539

2: Sequence, expression, and localization of the immunity protein for colicin M. Olschlager T, Braun V; J Bacteriol. 1987;169:4765-4769. PMID:2820942

3: X-ray structure and site-directed mutagenesis analysis of the Escherichia coli colicin M immunity protein. Gerard F, Brooks MA, Barreteau H, Touze T, Graille M, Bouhss A, Blanot D, van Tilbeurgh H, Mengin-Lecreulx D; J Bacteriol. 2011;193:205-214. PMID:21037007