Known Activities	Modules of approx. 40 residues found almost exclusively in fungi. The cellulose-binding function has been demonstrated in many cases, and appears to be mediated by three aromatic residues separated by about 10.4 angstrom and which form a flat surface. The only non-fungal occurence of CBM1 is in an algal non-hydrolytic polysaccharide-binding protein which is composed of four repeated CBM1 modules. Binding to chitin has been demonstrated in one case.
Note	Previously known as cellulose-binding domain family I (CBD I).
External resources	InterPro; PFAM; PROSITE; SMART;
Statistics	GenBank accession (555); Uniprot accession (248); PDB accession (17); 3D entries (3); cryst (1)