DcrB is a bacterial protein required for phages C1 and C6 adsorption [1,2]. It may be involved in the opening or formation of diffusion channels in the outer membrane [2]. Structurally, it consist of an antiparallel beta sheet with some alpha helical regions.

1: Genetic control of the resistance to phage C1 of Escherichia coli K-12. Likhacheva NA, Samsonov VV, Samsonov VV, Sineoky SP; J Bacteriol. 1996;178:5309-5315. PMID:8752353

2: DcrA and dcrB Escherichia coli genes can control DNA injection by phages specific for BtuB and FhuA receptors. Samsonov VV, Samsonov VV, Sineoky SP; Res Microbiol. 2002;153:639-646. PMID:12558182