Updated project metadata. Protein from B. bigemina PR cell lysates was analysed by 1D SDS PAGE and in solution digestion. Digested peptides were analysed by on-line nanoflow liquid chromatography using the nanoACQUITY-nLC system (Waters MS technologies, Manchester, UK) coupled to an LTQ-Orbitrap Velos (ThermoFisher Scientific, Bremen, Germany). Collected data were then analysed by Mascot (version 2.3.02, Matrix Science) and Progenesis LC–MS (version 4.1, Nonlinear Dynamics, UK).