Purity > 90% as determined by SDS-PAGE. MW: 38.9kDa. Full Length of Mature Protein: 26-232aa. N-terminal 6xHis-SUMO-tagged. Bacillus subtilis (strain 168). May promote colonization of plant roots. May cause loosening and extension of plant cell walls by disrupting non-covalent bonding between cellulose microfibrils and matrix glucans. Has very low expansin activity (in vitro). No enzymatic activity has been found. Binds to peptidoglycan and to plant cell walls.