1E8Q image
Deposition Date 2000-09-28
Release Date 2001-09-07
Last Version Date 2024-11-13
Entry Detail
PDB ID:
1E8Q
Title:
Characterisation of the cellulose docking domain from Piromyces equi
Biological Source:
Source Organism:
Piromyces equi (Taxon ID: 99929)
Host Organism:
Method Details:
Experimental Method:
Conformers Calculated:
50
Conformers Submitted:
5
Selection Criteria:
5 STRUCTURES SELECTED FROM THE 34 STRUCTURES WHICH HAD NO RESTRAINT VIOLATION
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Endoglucanase 45A
Gene (Uniprot):cel45A
Chain IDs:A
Chain Length:46
Number of Molecules:1
Biological Source:Piromyces equi
Ligand Molecules
Primary Citation
Characterization of a cellulosome dockerin domain from the anaerobic fungus Piromyces equi.
Nat. Struct. Biol. 8 775 778 (2001)
PMID: 11524680 DOI: 10.1038/nsb0901-775

Abstact

The recycling of photosynthetically fixed carbon in plant cell walls is a key microbial process. In anaerobes, the degradation is carried out by a high molecular weight multifunctional complex termed the cellulosome. This consists of a number of independent enzyme components, each of which contains a conserved dockerin domain, which functions to bind the enzyme to a cohesin domain within the protein scaffoldin protein. Here we describe the first three-dimensional structure of a fungal dockerin, the N-terminal dockerin of Cel45A from the anaerobic fungus Piromyces equi. The structure contains a novel fold of 42 residues. The ligand binding site consists of residues Trp 35, Tyr 8 and Asp 23, which are conserved in all fungal dockerins. The binding site is on the opposite side of the N- and C-termini of the molecule, implying that tandem dockerin domains, seen in the majority of anaerobic fungal plant cell wall degrading enzymes, could present multiple simultaneous binding sites and, therefore, permit tailoring of binding to catalytic demands.

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Primary Citation of related structures