1C91

Endo-Beta-N-Acetylglucosaminidase H, E132D


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.213 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Mutations of endo-beta-N-acetylglucosaminidase H active site residues Asp130 and Glu132: activities and conformations.

Rao, V.Cui, T.Guan, C.Van Roey, P.

(1999) Protein Sci. 8: 2338-2346

  • DOI: 10.1110/ps.8.11.2338
  • Primary Citation of Related Structures:  1C3F, 1C8X, 1C8Y, 1C90, 1C92, 1C93

  • PubMed Abstract: 
  • Endo-beta-N-acetylglucosaminidase H hydrolyzes the beta-(1-4)-glycosidic link of the N,N'-diacetylchitobiose core of high-mannose and hybrid asparagine-linked oligosaccharides. Seven mutants of the active site residues, Asp130 and Glu132, have been p ...

    Endo-beta-N-acetylglucosaminidase H hydrolyzes the beta-(1-4)-glycosidic link of the N,N'-diacetylchitobiose core of high-mannose and hybrid asparagine-linked oligosaccharides. Seven mutants of the active site residues, Asp130 and Glu132, have been prepared, assayed, and crystallized. They include single site mutants of each residue to the corresponding amide, to Ala and to the alternate acidic residue, and to the double amide mutant. The mutants of Asp130 are more active than the corresponding Glu132 mutants, consistent with the assignment of the latter residue as the primary catalytic residue. The amide mutants are more active than the alternate acidic residue mutants, which in turn are more active than the Ala mutants. The structures of the Asn mutant of Asp130 and the double mutant are very similar to that of the wild-type enzyme. Several residues surrounding the mutated residues, including some that form part of the core of the beta-barrel and especially Tyr168 and Tyr244, adopt a very different conformation in the structures of the other two mutants of Asp130 and in the Asp mutant of Glu132. The results show that the residues in the upper layers of the beta-barrel can organize into two very distinct packing arrangements that depend on subtle electrostatic and steric differences and that greatly affect the geometry of the substrate-binding cleft. Consequently, the relative activities of several of the mutants are defined by structural changes, leading to impaired substrate binding, in addition to changes in functionality.


    Organizational Affiliation

    Division of Molecular Medicine, Wadsworth Center, New York State Department of Health, Albany 12201-0509, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
ENDO-BETA-N-ACETYLGLUCOSAMINIDASE H
A
265Streptomyces plicatusEC: 3.2.1.96
Find proteins for P04067 (Streptomyces plicatus)
Go to UniProtKB:  P04067
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Work: 0.213 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 61.400α = 90.00
b = 61.400β = 90.00
c = 140.300γ = 90.00
Software Package:
Software NamePurpose
AMoREphasing
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1999-11-26
    Type: Initial release
  • Version 1.1: 2007-10-21
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-10-04
    Type: Refinement description