The Enzyme Database

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Accepted name: exo-chitinase (non-reducing end)
Reaction: Hydrolysis of N,N′-diacetylchitobiose from the non-reducing end of chitin and chitodextrins.
Other name(s): chiB (gene name)
Systematic name: (1→4)-2-acetamido-2-deoxy-β-D-glucan diacetylchitobiohydrolase (non-reducing end)
Comments: The enzyme hydrolyses the second glycosidic (1→4) linkage from non-reducing ends of chitin and chitodextrin molecules, liberating N,N′-diacetylchitobiose disaccharides. cf. EC, exo-chitinase (reducing end).
Links to other databases: BRENDA, EXPASY, KEGG, MetaCyc
1.  Tanaka, T., Fukui, T. and Imanaka, T. Different cleavage specificities of the dual catalytic domains in chitinase from the hyperthermophilic archaeon Thermococcus kodakaraensis KOD1. J. Biol. Chem. 276 (2001) 35629–35635. [PMID: 11468293]
2.  Hult, E.L., Katouno, F., Uchiyama, T., Watanabe, T. and Sugiyama, J. Molecular directionality in crystalline β-chitin: hydrolysis by chitinases A and B from Serratia marcescens 2170. Biochem. J. 388 (2005) 851–856. [PMID: 15717865]
3.  Ohnuma, T., Numata, T., Osawa, T., Mizuhara, M., Lampela, O., Juffer, A.H., Skriver, K. and Fukamizo, T. A class V chitinase from Arabidopsis thaliana: gene responses, enzymatic properties, and crystallographic analysis. Planta 234 (2011) 123–137. [PMID: 21390509]
4.  Gutierrez-Roman, M.I., Dunn, M.F., Tinoco-Valencia, R., Holguin-Melendez, F., Huerta-Palacios, G. and Guillen-Navarro, K. Potentiation of the synergistic activities of chitinases ChiA, ChiB and ChiC from Serratia marcescens CFFSUR-B2 by chitobiase (Chb) and chitin binding protein (CBP). World J Microbiol Biotechnol 30 (2014) 33–42. [PMID: 23824666]
[EC created 2017]

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