3B1C

Crystal structure of betaC-S lyase from Streptococcus anginosus: Internal aldimine form


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.147 
  • R-Value Observed: 0.149 

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Ligand Structure Quality Assessment 


This is version 1.1 of the entry. See complete history


Literature

Structural insights into catalysis by beta C-S lyase from Streptococcus anginosus

Kezuka, Y.Yoshida, Y.Nonaka, T.

(2012) Proteins 80: 2447-2458

  • DOI: https://doi.org/10.1002/prot.24129
  • Primary Citation of Related Structures:  
    3B1C, 3B1D, 3B1E

  • PubMed Abstract: 

    Hydrogen sulfide (H(2)S) is a causative agent of oral malodor and may play an important role in the pathogenicity of oral bacteria such as Streptococcus anginosus. In this microorganism, H(2)S production is associated with βC-S lyase (Lcd) encoded by lcd gene, which is a pyridoxal 5'-phosphate (PLP)-dependent enzyme that catalyzes the α,β-elimination of sulfur-containing amino acids. When Lcd acts on L-cysteine, H(2)S is produced along with pyruvate and ammonia. To understand the H(2)S-producing mechanism of Lcd in detail, we determined the crystal structures of substrate-free Lcd (internal aldimine form) and two reaction intermediate complexes (external aldimine and α-aminoacrylate forms). The formation of intermediates induced little changes in the overall structure of the enzyme and in the active site residues, with the exception of Lys234, a PLP-binding residue. Structural and mutational analyses highlighted the importance of the active site residues Tyr60, Tyr119, and Arg365. In particular, Tyr119 forms a hydrogen bond with the side chain oxygen atom of L-serine, a substrate analog, in the external aldimine form suggesting its role in the recognition of the sulfur atom of the true substrate (L-cysteine). Tyr119 also plays a role in fixing the PLP cofactor at the proper position during catalysis through binding with its side chain. Finally, we partly modified the catalytic mechanism known for cystalysin, a βC-S lyase from Treponema denticola, and proposed an improved mechanism, which seems to be common to the βC-S lyases from oral bacteria.


  • Organizational Affiliation

    Department of Structural Biology, School of Pharmacy, Iwate Medical University, Yahaba, Iwate, Japan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
BetaC-S lyase
A, B, C, D
392Streptococcus anginosusMutation(s): 0 
Gene Names: lcd
EC: 4.4.1.8
UniProt
Find proteins for A6BMJ3 (Streptococcus anginosus)
Explore A6BMJ3 
Go to UniProtKB:  A6BMJ3
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA6BMJ3
Sequence Annotations
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  • Reference Sequence
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
PLP
Query on PLP

Download Ideal Coordinates CCD File 
E [auth A],
K [auth B],
Q [auth C],
W [auth D]
PYRIDOXAL-5'-PHOSPHATE
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
SO4
Query on SO4

Download Ideal Coordinates CCD File 
F [auth A]
L [auth B]
M [auth B]
R [auth C]
X [auth D]
F [auth A],
L [auth B],
M [auth B],
R [auth C],
X [auth D],
Y [auth D]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L
GOL
Query on GOL

Download Ideal Coordinates CCD File 
AA [auth D]
BA [auth D]
G [auth A]
H [auth A]
I [auth A]
AA [auth D],
BA [auth D],
G [auth A],
H [auth A],
I [auth A],
J [auth A],
N [auth B],
O [auth B],
P [auth B],
S [auth C],
T [auth C],
U [auth C],
V [auth C],
Z [auth D]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.93 Å
  • R-Value Free: 0.188 
  • R-Value Work: 0.147 
  • R-Value Observed: 0.149 
  • Space Group: P 21 21 21
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 66.97α = 90
b = 111.14β = 90
c = 216.44γ = 90
Software Package:
Software NamePurpose
BSSdata collection
MOLREPphasing
REFMACrefinement
XDSdata reduction
XSCALEdata scaling

Structure Validation

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Ligand Structure Quality Assessment 


Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2012-06-27
    Type: Initial release
  • Version 1.1: 2014-01-22
    Changes: Database references