1MWO image
Deposition Date 2002-09-30
Release Date 2003-06-10
Last Version Date 2024-11-06
Entry Detail
PDB ID:
1MWO
Keywords:
Title:
Crystal Structure Analysis of the Hyperthermostable Pyrocoocus woesei alpha-amylase
Biological Source:
Source Organism:
Method Details:
Experimental Method:
Resolution:
2.20 Å
R-Value Free:
0.22
R-Value Work:
0.19
R-Value Observed:
0.19
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:alpha amylase
Chain IDs:A
Chain Length:435
Number of Molecules:1
Biological Source:Pyrococcus woesei
Primary Citation
Differential Regulation of a Hyperthermophilic alpha-Amylase with a Novel (Ca,Zn) Two-metal Center by Zinc
J.Biol.Chem. 278 9875 9884 (2003)
PMID: 12482867 DOI: 10.1074/jbc.M211339200

Abstact

The crystal structure of the alpha-amylase from the hyperthermophilic archaeon Pyrococcus woesei was solved in the presence of three inhibitors: acarbose, Tris, and zinc. In the absence of exogenous metals, this alpha-amylase bound 1 and 4 molar eq of zinc and calcium, respectively. The structure reveals a novel, activating, two-metal (Ca,Zn)-binding site and a second inhibitory zinc-binding site that is found in the -1 sugar-binding pocket within the active site. The data resolve the apparent paradox between the zinc requirement for catalytic activity and its strong inhibitory effect when added in molar excess. They provide a rationale as to why this alpha-amylase, in contrast to commercially available alpha-amylases, does not require the addition of metal ions for full catalytic activity, suggesting it as an ideal target to maximize the efficiency of industrial processes like liquefaction of starch.

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