Chitinase B1 (ChiB1)

Chitinase B1 (ChiB1) is an enzyme belonging to the glycosyl hydrolase family 18, widely studied in bacteria (such as Serratia marcescens) and fungi (such as Aspergillus fumigatus)[7][8]. It catalyzes the random hydrolysis (endo-type activity) of β-(1→4)-glycosidic linkages in chitin and chitodextrins, playing a central role in chitin degradation[8][7]. Structurally characterized by a TIM-barrel catalytic domain and, in many species, additional carbohydrate-binding domains, ChiB1 is essential for nutrient acquisition (e.g., bacteria/fungi breaking down exogenous chitin) and defense mechanisms[3][1]. Peptide inhibitors have demonstrated laboratory inhibition of this enzyme in fungal models and homologs[5]. While essential for many non-mammalian organisms, there is no evidence for a distinct "Chitinase B1" in humans. In humans, chitinase enzymes are limited to chitotriosidase (CHIT1) and acidic mammalian chitinase (AMCase), which play roles in innate immunity and disease[2][4]. Thus, "Chitinase B1" as a therapeutic target is relevant mainly in the context of microbial (fungal or bacterial) pathogenesis or environmental chitin degradation, and not directly implicated in human physiology or diseases[2][4][5][7]. Key caveat: There is some potential confusion due to naming—“Chitinase B1” refers to specific microbial/fungal (not human) enzymes. It is not currently recognized as a canonical target in human disease, but may be of interest for antifungal drug development or agricultural/biotechnological use. Therefore, is_incorrect: true (for human clinical target context); for microbial or biotechnological context, the entry is correct.

Other names

Chitinase B1chiB1endochitinase B1Chitinase Bchitobiosidase (bacterial)AfChiB1 (Aspergillus fumigatus)chiB (Serratia marcescens)

Enzyme inhibition—prevents chitin hydrolysis, leading to antifungal or antibacterial action