This region is found commonly in chitin synthases classes I, II and III. Chitin a linear homopolymer of GlcNAc residues, it is an important component of the cell wall of fungi and is synthesised on the cytoplasmic surface of the cell membrane by membrane bound chitin synthases [2].

1: Molecular cloning and sequencing of a chitin synthase gene (CHS2) of Paracoccidioides brasiliensis. Nino-Vega GA, Buurman ET, Gooday GW, San-Blas G, Gow NA; Yeast 1998;14:181-187. PMID:9483806

2: The fungal cell wall as a drug target. Georgopapadakou NH, Tkacz JS; Trends Microbiol 1995;3:98-104. PMID:7773595

3: Classification of fungal chitin synthases. Bowen AR, Chen-Wu JL, Momany M, Young R, Szaniszlo PJ, Robbins PW; Proc Natl Acad Sci U S A 1992;89:519-523. PMID:1731323