6XCK

Crystal structure of C-As lyase with mutation K105E


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.216 

Starting Model: experimental
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This is version 1.2 of the entry. See complete history


Literature

The ArsI C-As lyase: Elucidating the catalytic mechanism of degradation of organoarsenicals.

Nadar, V.S.Kandavelu, P.Sankaran, B.Rosen, B.P.Yoshinaga, M.

(2022) J Inorg Biochem 232: 111836-111836

  • DOI: https://doi.org/10.1016/j.jinorgbio.2022.111836
  • Primary Citation of Related Structures:  
    6XA0, 6XCK

  • PubMed Abstract: 

    Organoarsenicals such as monosodium methylarsenate (MSMA or MAs(V)) and roxarsone (4-hydroxyl-3-nitrophenylarsenate or Rox(V)) have been extensively used as herbicides and growth enhancers for poultry, respectively. Degradation of organoarsenicals to inorganic arsenite (As(III)) contaminates crops and drinking water. One such process is catalyzed by the bacterial enzyme ArsI, whose gene is found in many soil bacteria. ArsI is a non-heme ferrous iron (Fe(II))-dependent dioxygenase that catalyzes oxygen-dependent cleavage of the carbon‑arsenic (C-As) bond in trivalent organoarsenicals, degrading them to inorganic As(III). From previous crystal structures of ArsI, we predicted that a loop-gating mechanism controls the catalytic reaction. Understanding the catalytic mechanism of ArsI requires knowledge of the mechanisms of substrate binding and activation of dioxygen. Here we report new ArsI structures with bound Rox(III) and mutant enzymes with alteration of active site residues. Our results elucidate steps in the catalytic cycle of this novel dioxygenase and enhance understanding of the recycling of environmental organoarsenicals.


  • Organizational Affiliation

    Department of Cellular Biology and Pharmacology, Herbert Wertheim College of Medicine, Florida International University, Miami, FL 33199, USA.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
Glyoxalase/bleomycin resistance protein/dioxygenase
A, B
126Thermomonospora curvata DSM 43183Mutation(s): 1 
Gene Names: Tcur_4156
UniProt
Find proteins for D1A230 (Thermomonospora curvata (strain ATCC 19995 / DSM 43183 / JCM 3096 / KCTC 9072 / NBRC 15933 / NCIMB 10081 / Henssen B9))
Explore D1A230 
Go to UniProtKB:  D1A230
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupD1A230
Sequence Annotations
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.62 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.214 
  • R-Value Observed: 0.216 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 42.25α = 90
b = 43.195β = 90
c = 119.431γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHASERphasing

Structure Validation

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Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)United StatesR37 GM055425

Revision History  (Full details and data files)

  • Version 1.0: 2021-06-16
    Type: Initial release
  • Version 1.1: 2022-06-29
    Changes: Database references
  • Version 1.2: 2023-10-18
    Changes: Data collection, Refinement description