5AJO

Crystal structure of the inactive form of GalNAc-T2 in complex with the glycopeptide MUC5AC-3,13

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.158 

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This is version 2.0 of the entry. See complete history. 


Literature

Dynamic Interplay between Catalytic and Lectin Domains of Galnac-Transferases Modulates Protein O-Glycosylation.

Lira-Navarrete, E., De Las Rivas, M., Companon, I., Pallares, M.C., Kong, Y., Iglesias-Fernandez, J., Bernardes, G.J.L., Peregrina, J.M., Rovira, C., Bernado, P., Bruscolini, P., Clausen, H., Lostao, A., Corzana, F., Hurtado-Guerrero, R.

(2015) Nat Commun 6: 6937

  • DOI: https://doi.org/10.1038/ncomms7937
  • Primary Citation of Related Structures:  
    5AJN, 5AJO, 5AJP

  • PubMed Abstract: 

    • Protein O-glycosylation is controlled by polypeptide GalNAc-transferases (GalNAc-Ts) that uniquely feature both a catalytic and lectin domain. The underlying molecular basis of how the lectin domains of GalNAc-Ts contribute to glycopeptide specificity and catalysis remains unclear ...

    Protein O-glycosylation is controlled by polypeptide GalNAc-transferases (GalNAc-Ts) that uniquely feature both a catalytic and lectin domain. The underlying molecular basis of how the lectin domains of GalNAc-Ts contribute to glycopeptide specificity and catalysis remains unclear. Here we present the first crystal structures of complexes of GalNAc-T2 with glycopeptides that together with enhanced sampling molecular dynamics simulations demonstrate a cooperative mechanism by which the lectin domain enables free acceptor sites binding of glycopeptides into the catalytic domain. Atomic force microscopy and small-angle X-ray scattering experiments further reveal a dynamic conformational landscape of GalNAc-T2 and a prominent role of compact structures that are both required for efficient catalysis. Our model indicates that the activity profile of GalNAc-T2 is dictated by conformational heterogeneity and relies on a flexible linker located between the catalytic and the lectin domains. Our results also shed light on how GalNAc-Ts generate dense decoration of proteins with O-glycans.

    Organizational Affiliation: 

    1] BIFI, University of Zaragoza, BIFI-IQFR (CSIC) Joint Unit, Mariano Esquillor s/n, Campus Rio Ebro, Edificio I+D, Zaragoza 50018, Spain [2] Fundación ARAID, 50018 Zaragoza, Spain.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
POLYPEPTIDE N-ACETYLGALACTOSAMINYLTRANSFERASE 2571Homo sapiensMutation(s): 1 
Gene Names: GALNT2
EC: 2.4.1.41
UniProt & NIH Common Fund Data Resources
Find proteins for Q10471 (Homo sapiens)
Explore Q10471 
Go to UniProtKB:  Q10471
PHAROS:  Q10471
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupQ10471
Protein Feature View
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  • Reference Sequence

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Entity ID: 2
MoleculeChainsSequence LengthOrganismDetailsImage
MUCIN17Homo sapiensMutation(s): 0 
Gene Names: MUC5AC, MUC5
UniProt & NIH Common Fund Data Resources
Find proteins for P98088 (Homo sapiens)
Explore P98088 
Go to UniProtKB:  P98088
PHAROS:  P98088
Entity Groups  
Sequence Clusters30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt GroupP98088
Protein Feature View
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  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
A2G
Query on A2G
Download Ideal Coordinates CCD File 
C [auth A],
D [auth A]		2-acetamido-2-deoxy-alpha-D-galactopyranose
C8 H15 N O6
OVRNDRQMDRJTHS-CBQIKETKSA-N		 Ligand Interaction
SO4
Query on SO4
Download Ideal Coordinates CCD File 
AA [auth A]
BA [auth A]
CA [auth A]
DA [auth A]
E [auth A]
AA [auth A],
BA [auth A],
CA [auth A],
DA [auth A],
E [auth A],
EA [auth A],
F [auth A],
FA [auth A],
G [auth A],
GA [auth A],
H [auth A],
HA [auth A],
I [auth A],
IA [auth A],
J [auth A],
K [auth A],
L [auth A],
M [auth A],
N [auth A],
O [auth A],
P [auth A],
Q [auth A],
R [auth A],
S [auth A],
T [auth A],
U [auth A],
V [auth A],
W [auth A],
X [auth A],
Y [auth A],
Z [auth A]
SULFATE ION
O4 S
QAOWNCQODCNURD-UHFFFAOYSA-L		 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 1.48 Å
  • R-Value Free: 0.181 
  • R-Value Work: 0.158 
  • R-Value Observed: 0.158 
  • Space Group: I 41
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 87.203α = 90
b = 87.203β = 90
c = 179.074γ = 90
Software Package:
Software NamePurpose
REFMACrefinement
XDSdata reduction
SCALEPACKdata scaling
MOLREPphasing

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2015-03-11
    Type: Initial release
  • Version 1.1: 2015-05-20
    Changes: Database references
  • Version 1.2: 2017-09-13
    Changes: Data collection
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Other, Structure summary