4YAQ

Crystal structure of a computationally optimized PG9 mutant

Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 

wwPDB Validation 3D Report Full Report



Literature

Redesigned HIV antibodies exhibit enhanced neutralizing potency and breadth.

Willis, J.R., Sapparapu, G., Murrell, S., Julien, J.P., Singh, V., King, H.G., Xia, Y., Pickens, J.A., LaBranche, C.C., Slaughter, J.C., Montefiori, D.C., Wilson, I.A., Meiler, J., Crowe, J.E.

(2015) J Clin Invest 125: 2523-2531

  • DOI: 10.1172/JCI80693
  • Structures With Same Primary Citation

  • PubMed Abstract: 

    • Several HIV envelope-targeting (Env-targeting) antibodies with broad and potent neutralizing activity have been identified and shown to have unusual features. Of these, the PG9 antibody has a long heavy chain complementarity determining region 3 (HCD ...

    Several HIV envelope-targeting (Env-targeting) antibodies with broad and potent neutralizing activity have been identified and shown to have unusual features. Of these, the PG9 antibody has a long heavy chain complementarity determining region 3 (HCDR3) and possesses unique structural elements that interact with protein and glycan features of the HIV Env glycoprotein. Here, we used the Rosetta software suite to design variants of the PG9 antibody HCDR3 loop with the goal of identifying variants with increased potency and breadth of neutralization for diverse HIV strains. One variant, designated PG9_N100(F)Y, possessed increased potency and was able to neutralize a diverse set of PG9-resistant HIV strains, including those lacking the Env N160 glycan, which is critical for PG9 binding. An atomic resolution structure of the PG9_N100(F)Y fragment antigen binding (Fab) confirmed that the mutated residue retains the paratope surface when compared with WT PG9. Differential scanning calorimetry experiments revealed that the mutation caused a modest increase in thermodynamic stability of the Fab, a feature predicted by the computational model. Our findings suggest that thermodynamic stabilization of the long HCDR3 in its active conformation is responsible for the increased potency of PG9_N100(F)Y, and strategies aimed at stabilizing this region in other HIV antibodies could become an important approach to in silico optimization of antibodies.

    Organizational Affiliation: 

    State Key Laboratory of Molecular Biology and Research Center for Structural Biology, Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences and Graduate School of Chinese Academy of Sciences, 320 Yue-Yang Road, Shanghai 200031, China.



Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
PG9_N100FY Fab heavy chainA, H248Homo sapiensMutation(s): 0 
Protein Feature View
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  • Reference Sequence

Find similar proteins by: Sequence  |  Structure

Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
PG9_N100FY Light ChainB, L216Homo sapiensMutation(s): 0 
Gene Names: IGL@
Find proteins for Q6GMW3 (Homo sapiens)
Explore Q6GMW3 
Go to UniProtKB:  Q6GMW3
Protein Feature View
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  • Reference Sequence
Oligosaccharides
Entity ID: 3
MoleculeChainsChain Length2D Diagram Glycosylation
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose
C, D
3 N-Glycosylation
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
MES
Query on MES
Download CCD File 
B, H, L
2-(N-MORPHOLINO)-ETHANESULFONIC ACID
C6 H13 N O4 S
SXGZJKUKBWWHRA-UHFFFAOYSA-N		 Ligand Interaction
PO4
Query on PO4
Download CCD File 
H, L
PHOSPHATE ION
O4 P
NBIIXXVUZAFLBC-UHFFFAOYSA-K		 Ligand Interaction
Modified Residues  2 Unique
IDChainsTypeFormula2D DiagramParent
PCA
Query on PCA		A,HL-PEPTIDE LINKINGC5 H7 N O3GLN
TYS
Query on TYS		A,HL-PEPTIDE LINKINGC9 H11 N O6 STYR
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.30 Å
  • R-Value Free: 0.238 
  • R-Value Work: 0.204 
  • R-Value Observed: 0.206 
  • Space Group: P 1 21 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 57.74α = 90
b = 122.98β = 96.27
c = 69.92γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
XDSdata reduction
XDSdata scaling
PHASERphasing

Structure Validation

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View more in-depth experimental data

Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2015-06-03
    Type: Initial release
  • Version 1.1: 2015-06-10
    Changes: Database references
  • Version 1.2: 2017-08-23
    Changes: Author supporting evidence, Database references, Derived calculations, Source and taxonomy
  • Version 2.0: 2020-07-29
    Type: Remediation
    Reason: Carbohydrate remediation
    Changes: Atomic model, Data collection, Derived calculations, Polymer sequence, Structure summary