Chitinase A from Stenotrophomonas maltophilia shows transglycosylation and antifungal activities

► Multi domain chitinase A and a single catalytic domain chitinase B of Stenotrophomonas maltophilia were characterized. ► Chitinase A was an endo acting enzyme active on both oligomeric and polymeric substrates. ► Chitinase B was exo/endo acting enzyme, that can hydrolyze only oligomeric substrates. ► Chitinase A, and not chitinase B, exhibited transglycosylation on tetra- and hexameric chitooligosaccharides. ► Chitinase A also showed antifungal activity against Fusarium oxysporum.