Robuta

https://www.ncbi.nlm.nih.gov/Structure/pdb/1CXK 1CXK: COMPLEX BETWEEN A MALTONONAOSE SUBSTRATE AND BACILLUS CIRCULANS STRAIN 251 CGTASE E257Q/D229N PROTEIN (CYCLODEXTRIN-GLYCOSYLTRANSFERASE)CALCIUM IONalpha-D-glucopyranose