Mannose-recognition mutant of the galactose/N-acetylgalactosamine-specific C-type lectin CEL-I engineered by site-directed mutagenesis.
Moriuchi, H., Unno, H., Goda, S., Tateno, H., Hirabayashi, J., Hatakeyama, T.(2015) Biochim Biophys Acta 1850: 1457-1465
- PubMed: 25869490 
- DOI: https://doi.org/10.1016/j.bbagen.2015.04.004
- Primary Citation of Related Structures:  
4WQQ - PubMed Abstract: 
CEL-I is a galactose/N-acetylgalactosamine-specific C-type lectin isolated from the sea cucumber Cucumaria echinata. Its carbohydrate-binding site contains a QPD (Gln-Pro-Asp) motif, which is generally recognized as the galactose specificity-determining motif in the C-type lectins. In our previous study, replacement of the QPD motif by an EPN (Glu-Pro-Asn) motif led to a weak binding affinity for mannose. Therefore, we examined the effects of an additional mutation in the carbohydrate-binding site on the specificity of the lectin.
Organizational Affiliation: 
Laboratory of Biomolecular Chemistry, Graduate School of Engineering, Nagasaki University, 1-14 Bunkyo-machi, Nagasaki 852-8521, Japan.