Polymerizes chitin, a structural polymer of the cell wall and septum, by transferring the sugar moiety of UDP-GlcNAc to the non-reducing end of the growing chitin polymer (PubMed:16278457). Produces a large proportion of the chitin that is not deacetylated to chitosan (PubMed:16278457). [(1->4)-N-acetyl-beta-D-glucosaminyl](n) + UDP-N-acetyl-alpha-D-glucosamine = [(1->4)-N-acetyl-beta-D-glucosaminyl](n+1) + H(+) + UDP Induced by high temperature (PubMed:27611567). Repressed by the antifungal agent caspofungin (PubMed:31266771). Decreases cellular chitin level (PubMed:16278457). Abnormal capsular morphology: lower fiber density, abnormal fiber distribution, decreases capsular diameter (PubMed:32743128). Increases extracellular vesicle secretion (PubMed:32743128). Sensitive to high temperature (PubMed:16278457). In the N-terminal section; belongs to the TRAFAC class CC myosin-kinesin ATPase superfamily. Myosin family. In the C-terminal section; belongs to the chitin synthase family. Class V subfamily.