1EH9

CRYSTAL STRUCTURE OF SULFOLOBUS SOLFATARICUS GLYCOSYLTREHALOSE TREHALOHYDROLASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history


Literature

Crystal structure of glycosyltrehalose trehalohydrolase from the hyperthermophilic archaeum Sulfolobus solfataricus.

Feese, M.D.Kato, Y.Tamada, T.Kato, M.Komeda, T.Miura, Y.Hirose, M.Hondo, K.Kobayashi, K.Kuroki, R.

(2000) J Mol Biol 301: 451-464

  • DOI: 10.1006/jmbi.2000.3977
  • Primary Citation of Related Structures:  
    1EH9, 1EHA

  • PubMed Abstract: 
  • The crystal structure of glycosyltrehalose trehalohydrolase from the hyperthermophilic archaeum Sulfolobus solfataricus KM1 has been solved by multiple isomorphous replacement. The enzyme is an alpha-amylase (family 13) with unique exo-amylolytic act ...

    The crystal structure of glycosyltrehalose trehalohydrolase from the hyperthermophilic archaeum Sulfolobus solfataricus KM1 has been solved by multiple isomorphous replacement. The enzyme is an alpha-amylase (family 13) with unique exo-amylolytic activity for glycosyltrehalosides. It cleaves the alpha-1,4 glycosidic bond adjacent to the trehalose moiety to release trehalose and maltooligo saccharide. Unlike most other family 13 glycosidases, the enzyme does not require Ca(2+) for activity, and it contains an N-terminal extension of approximately 100 amino acid residues that is homologous to N-terminal domains found in many glycosidases that recognize branched oligosaccharides. Crystallography revealed the enzyme to exist as a homodimer covalently linked by an intermolecular disulfide bond at residue C298. The existence of the intermolecular disulfide bond was confirmed by biochemical analysis and mutagenesis. The N-terminal extension forms an independent domain connected to the catalytic domain by an extended linker. The functionally essential Ca(2+) binding site found in the B domain of alpha-amylases and many other family 13 glycosidases was found to be replaced by hydrophobic packing interactions. The enzyme also contains a very unusual excursion in the (beta/alpha)(8) barrel structure of the catalytic domain. This excursion originates from the bottom of the (beta/alpha)(8) barrel between helix 6 and strand 7, but folds upward in a distorted alpha-hairpin structure to form a part of the substrate binding cleft wall that is possibly critical for the enzyme's unique substrate selectivity. Participation of an alpha-beta loop in the formation of the substrate binding cleft is a novel feature that is not observed in other known (beta/alpha)(8) enzymes.


    Organizational Affiliation

    Central Laboratories for Key Technology, Kirin Brewery Co. Ltd, 1-13-5 Fukuura, Kanazawa, Yokohama 236, Japan,



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
GLYCOSYLTREHALOSE TREHALOHYDROLASEA558Saccharolobus solfataricusMutation(s): 0 
Gene Names: treZ
EC: 3.2.1.1 (PDB Primary Data), 3.2.1.141 (UniProt)
Find proteins for Q55088 (Saccharolobus solfataricus)
Explore Q55088 
Go to UniProtKB:  Q55088
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3.00 Å
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 80.236α = 90
b = 80.236β = 90
c = 281.973γ = 120
Software Package:
Software NamePurpose
DENZOdata reduction
SCALEPACKdata scaling
PHASESphasing
TNTrefinement

Structure Validation

View Full Validation Report



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-02-19
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance