7W1E

Crystal structure of Klebsiella pneumoniae K1 capsule-specific polysaccharide lyase in complex with products


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.46 Å
  • R-Value Free: 0.148 
  • R-Value Work: 0.114 
  • R-Value Observed: 0.116 

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Literature

Structural and biological insights into Klebsiella pneumoniae surface polysaccharide degradation by a bacteriophage K1 lyase: implications for clinical use.

Tu, I.F.Lin, T.L.Yang, F.L.Lee, I.M.Tu, W.L.Liao, J.H.Ko, T.P.Wu, W.J.Jan, J.T.Ho, M.R.Chou, C.Y.Wang, A.H.Wu, C.Y.Wang, J.T.Huang, K.F.Wu, S.H.

(2022) J Biomed Sci 29: 9-9

  • DOI: https://doi.org/10.1186/s12929-022-00792-4
  • Primary Citation of Related Structures:  
    7W1C, 7W1D, 7W1E

  • PubMed Abstract: 

    K1 capsular polysaccharide (CPS)-associated Klebsiella pneumoniae is the primary cause of pyogenic liver abscesses (PLA) in Asia. Patients with PLA often have serious complications, ultimately leading to a mortality of ~ 5%. This K1 CPS has been reported as a promising target for development of glycoconjugate vaccines against K. pneumoniae infection. The pyruvylation and O-acetylation modifications on the K1 CPS are essential to the immune response induced by the CPS. To date, however, obtaining the fragments of K1 CPS that contain the pyruvylation and O-acetylation for generating glycoconjugate vaccines still remains a challenge. We analyzed the digested CPS products with NMR spectroscopy and mass spectrometry to reveal a bacteriophage-derived polysaccharide depolymerase specific to K1 CPS. The biochemical and biophysical properties of the enzyme were characterized and its crystal structures containing bound CPS products were determined. We also performed site-directed mutagenesis, enzyme kinetic analysis, phage absorption and infectivity studies, and treatment of the K. pneumoniae-infected mice with the wild-type and mutant enzymes. We found a bacteriophage-derived polysaccharide lyase that depolymerizes the K1 CPS into fragments of 1-3 repeating trisaccharide units with the retention of the pyruvylation and O-acetylation, and thus the important antigenic determinants of intact K1 CPS. We also determined the 1.46-Å-resolution, product-bound crystal structure of the enzyme, revealing two distinct carbohydrate-binding sites in a trimeric β-helix architecture, which provide the first direct evidence for a second, non-catalytic, carbohydrate-binding site in bacteriophage-derived polysaccharide depolymerases. We demonstrate the tight interaction between the pyruvate moiety of K1 CPS and the enzyme in this second carbohydrate-binding site to be crucial to CPS depolymerization of the enzyme as well as phage absorption and infectivity. We also demonstrate that the enzyme is capable of protecting mice from K1 K. pneumoniae infection, even against a high challenge dose. Our results provide insights into how the enzyme recognizes and depolymerizes the K1 CPS, and demonstrate the potential use of the protein not only as a therapeutic agent against K. pneumoniae, but also as a tool to prepare structurally-defined oligosaccharides for the generation of glycoconjugate vaccines against infections caused by this organism.


  • Organizational Affiliation

    Institute of Biological Chemistry, Academia Sinica, No. 128 Academia Road Section 2, Nan‑Kang, Taipei, 115, Taiwan.


Macromolecules
Find similar proteins by:  (by identity cutoff)  |  3D Structure
Entity ID: 1
MoleculeChains Sequence LengthOrganismDetailsImage
K1 LYASE
A, B, C, D, E
A, B, C, D, E, F
671Klebsiella phage NTUH-K2044-K1-1Mutation(s): 2 
EC: 4
UniProt
Find proteins for A0A068Q5Q5 (Klebsiella phage NTUH-K2044-K1-1)
Explore A0A068Q5Q5 
Go to UniProtKB:  A0A068Q5Q5
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupA0A068Q5Q5
Sequence Annotations
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  • Reference Sequence
Oligosaccharides

Help

Entity ID: 2
MoleculeChains Length2D Diagram Glycosylation3D Interactions
3-O-acetyl-6-deoxy-alpha-L-galactopyranose-(1-3)-beta-D-glucopyranose
G, H, I, J, K
G, H, I, J, K, L, M, N, O, P
2N/A
Small Molecules
Ligands 3 Unique
IDChains Name / Formula / InChI Key2D Diagram3D Interactions
98X (Subject of Investigation/LOI)
Query on 98X

Download Ideal Coordinates CCD File 
BA [auth B]
FA [auth C]
JA [auth D]
KA [auth D]
PA [auth E]
BA [auth B],
FA [auth C],
JA [auth D],
KA [auth D],
PA [auth E],
QA [auth E],
V [auth A],
VA [auth F],
W [auth A],
X [auth A]
2,6-anhydro-4,5-O-[(1R)-1-carboxyethylidene]-3-deoxy-L-threo-hex-2-enonic acid
C9 H10 O7
ILHRGDJLAZPQBR-QKVARQBESA-N
GOL (Subject of Investigation/LOI)
Query on GOL

Download Ideal Coordinates CCD File 
AA [auth B]
CA [auth C]
DA [auth C]
HA [auth D]
IA [auth D]
AA [auth B],
CA [auth C],
DA [auth C],
HA [auth D],
IA [auth D],
LA [auth E],
OA [auth E],
R [auth A],
RA [auth F],
S [auth A],
SA [auth F],
U [auth A],
UA [auth F],
Y [auth B]
GLYCEROL
C3 H8 O3
PEDCQBHIVMGVHV-UHFFFAOYSA-N
IMD (Subject of Investigation/LOI)
Query on IMD

Download Ideal Coordinates CCD File 
EA [auth C]
GA [auth D]
MA [auth E]
NA [auth E]
Q [auth A]
EA [auth C],
GA [auth D],
MA [auth E],
NA [auth E],
Q [auth A],
T [auth A],
TA [auth F],
Z [auth B]
IMIDAZOLE
C3 H5 N2
RAXXELZNTBOGNW-UHFFFAOYSA-O
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.46 Å
  • R-Value Free: 0.148 
  • R-Value Work: 0.114 
  • R-Value Observed: 0.116 
  • Space Group: P 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 90.626α = 80.4
b = 100.991β = 70.48
c = 125.38γ = 83.99
Software Package:
Software NamePurpose
HKL-2000data reduction
HKL-2000data scaling
MOLREPphasing
REFMACrefinement
PDB_EXTRACTdata extraction

Structure Validation

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Ligand Structure Quality Assessment 


Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
Ministry of Science and Technology (MoST, Taiwan)TaiwanMOST-108-2113-M-001-008
Academia Sinica (Taiwan)TaiwanAS-KPQ-110-ITAR-11

Revision History  (Full details and data files)

  • Version 1.0: 2022-05-18
    Type: Initial release
  • Version 1.1: 2024-05-29
    Changes: Data collection