Download MendeleyStructural and Thermodynamic Dissection of Specific Mannan Recognition by a Carbohydrate Binding Module, Tmcbm27
Boraston, A.B., Revett, T.J., Boraston, C.M., Nurizzo, D., Davies, G.J.(2003) Structure 11: 665
- PubMed: 12791255
- DOI: https://doi.org/10.1016/s0969-2126(03)00100-x
- Primary Citation of Related Structures:
1OF3, 1OF4, 1OH4 - PubMed Abstract:
The C-terminal 176 amino acids of a Thermotoga maritima mannanase (Man5) constitute a carbohydrate binding module (CBM) that has been classified into CBM family 27. The isolated CBM27 domain, named TmCBM27, binds tightly (K(a)s 10(5)-10(6) M(-1)) to beta-1, 4-mannooligosaccharides, carob galactomannan, and konjac glucomannan, but not to cellulose (insoluble and soluble) or soluble birchwood xylan. The X-ray crystal structures of native TmCBM27, a TmCBM27-mannohexaose complex, and a TmCBM27-6(3),6(4)-alpha-D-galactosyl-mannopentaose complex at 2.0 A, 1.6 A, and 1.35 A, respectively, reveal the basis of TmCBM27's specificity for mannans. In particular, the latter complex, which is the first structure of a CBM in complex with a branched plant cell wall polysaccharide, illustrates how the architecture of the binding site can influence the recognition of naturally substituted polysaccharides.
Organizational Affiliation:
Department of Chemistry, University of York, Heslington, York YO10 5YW, United Kingdom.
