2ZLY

Structure of 6-aminohexanoate-dimer hydrolase, D370Y mutant


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 

Starting Model: experimental
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wwPDB Validation   3D Report Full Report


This is version 1.4 of the entry. See complete history


Literature

Two alternative modes for optimizing nylon-6 byproduct hydrolytic activity from a carboxylesterase with a beta-lactamase fold: X-ray crystallographic analysis of directly evolved 6-aminohexanoate-dimer hydrolase.

Ohki, T.Shibata, N.Higuchi, Y.Kawashima, Y.Takeo, M.Kato, D.Negoro, S.

(2009) Protein Sci 18: 1662-1673

  • DOI: https://doi.org/10.1002/pro.185
  • Primary Citation of Related Structures:  
    2ZLY, 2ZM2, 2ZM8, 2ZM9

  • PubMed Abstract: 

    Promiscuous 6-aminohexanoate-linear dimer (Ald)-hydrolytic activity originally obtained in a carboxylesterase with a beta-lactamase fold was enhanced about 80-fold by directed evolution using error-prone PCR and DNA shuffling. Kinetic studies of the mutant enzyme (Hyb-S4M94) demonstrated that the enzyme had acquired an increased affinity (K(m) = 15 mM) and turnover (k(cat) = 3.1 s(-1)) for Ald, and that a catalytic center suitable for nylon-6 byproduct hydrolysis had been generated. Construction of various mutant enzymes revealed that the enhanced activity in the newly evolved enzyme is due to the substitutions R187S/F264C/D370Y. Crystal structures of Hyb-S4M94 with bound substrate suggested that catalytic function for Ald was improved by hydrogen-bonding/hydrophobic interactions between the Ald--COOH and Tyr370, a hydrogen-bonding network from Ser187 to Ald--NH(3) (+), and interaction between Ald--NH(3) (+) and Gln27-O(epsilon) derived from another subunit in the homo-dimeric structure. In wild-type Ald-hydrolase (NylB), Ald-hydrolytic activity is thought to be optimized by the substitutions G181D/H266N, which improve an electrostatic interaction with Ald--NH(3) (+) (Kawashima et al., FEBS J 2009; 276:2547-2556). We propose here that there exist at least two alternative modes for optimizing the Ald-hydrolytic activity of a carboxylesterase with a beta-lactamase fold.


  • Organizational Affiliation

    Department of Materials Science and Chemistry, Graduate School of Engineering, University of Hyogo, Hyogo 671-2280, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
6-aminohexanoate-dimer hydrolase392Flavobacterium sp.Mutation(s): 1 
Gene Names: NYLBNYLB'
EC: 3.5.1.46
UniProt
Find proteins for P07062 (Paenarthrobacter ureafaciens)
Explore P07062 
Go to UniProtKB:  P07062
Find proteins for P07061 (Paenarthrobacter ureafaciens)
Explore P07061 
Go to UniProtKB:  P07061
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupsP07061P07062
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.58 Å
  • R-Value Free: 0.206 
  • R-Value Work: 0.187 
  • R-Value Observed: 0.187 
  • Space Group: P 32 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 96.685α = 90
b = 96.685β = 90
c = 113.355γ = 120
Software Package:
Software NamePurpose
CNSrefinement
HKL-2000data reduction
HKL-2000data scaling
CNSphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2009-04-21
    Type: Initial release
  • Version 1.1: 2011-07-13
    Changes: Non-polymer description, Version format compliance
  • Version 1.2: 2017-08-23
    Changes: Refinement description, Source and taxonomy
  • Version 1.3: 2021-11-10
    Changes: Database references, Derived calculations
  • Version 1.4: 2023-11-01
    Changes: Data collection, Refinement description