1OF4 image
Entry Detail
PDB ID:
1OF4
Title:
Structural and thermodynamic dissection of specific mannan recognition by a carbohydrate-binding module, TmCBM27
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2003-04-07
Release Date:
2003-04-17
Method Details:
Experimental Method:
Resolution:
1.60 Å
R-Value Free:
0.20
R-Value Work:
0.16
R-Value Observed:
0.16
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:BETA-MANNOSIDASE
Chain IDs:A
Chain Length:179
Number of Molecules:1
Biological Source:THERMOTOGA MARITIMA
Primary Citation
Structural and Thermodynamic Dissection of Specific Mannan Recognition by a Carbohydrate Binding Module, Tmcbm27
Structure 11 665 ? (2003)
PMID: 12791255 DOI: 10.1016/S0969-2126(03)00100-X

Abstact

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.

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