ISDA

Entry Detail

PDB ID:

2BOE

Keywords:

HYDROLASE

Title:

Catalytic domain of endo-1,4-glucanase Cel6A mutant Y73S from Thermobifida fusca

Biological Source:

Source Organism:

THERMOMONOSPORA FUSCA

Host Organism:

ESCHERICHIA COLI

PDB Version:

Deposition Date:

2005-04-10

Release Date:

2005-10-05

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.15 Å

R-Value Free:

0.19

R-Value Work:

0.16

R-Value Observed:

0.16

Space Group:

P 21 21 21

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:ENDOGLUCANASE E-2
Mutations:YES
Chain IDs:A (auth: X)
Chain Length:286
Number of Molecules:1
Biological Source:THERMOMONOSPORA FUSCA

UniProt ID:P26222 Pfam ID:PF01341

Primary Citation

Crystal Structure of Thermobifida Fusca Endoglucanase Cel6A in Complex with Substrate and Inhibitor: The Role of Tyrosine Y73 in Substrate Ring Distortion.

Larsson, A.M, Bergfors, T, Dultz, E, Irwin, D.C, Roos, A, Driguez, H, Wilson, D.B, Jones, T.A.Show

Biochemistry 44 12915 ? (2005)

PMID: 16185060 DOI: 10.1021/BI0506730

Abstact

Endoglucanase Cel6A from Thermobifida fusca hydrolyzes the beta-1,4 linkages in cellulose at accessible points along the polymer. The structure of the catalytic domain of Cel6A from T. fusca in complex with a nonhydrolysable substrate analogue that acts as an inhibitor, methylcellobiosyl-4-thio-beta-cellobioside (Glc(2)-S-Glc(2)), has been determined to 1.5 A resolution. The glycosyl unit in subsite -1 was sterically hindered by Tyr73 and forced into a distorted (2)S(o) conformation. In the enzyme where Tyr73 was mutated to a serine residue, the hindrance was removed and the glycosyl unit in subsite -1 had a relaxed (4)C(1) chair conformation. The relaxed conformation was seen in two complex structures of the mutated enzyme, with cellotetrose (Glc(4)) at 1.64 A and Glc(2)-S-Glc(2) at 1.04 A resolution.

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Primary Citation of related structures