3RU8

Structure of an HIV epitope scaffold in complex with neutralizing antibody b12 Fab

PDB DOI: https://doi.org/10.2210/pdb3RU8/pdb

Classification: DE NOVO PROTEIN, IMMUNE SYSTEM
Organism(s): Human immunodeficiency virus, synthetic construct, Thermobifida fusca, Homo sapiens
Expression System: Escherichia coli, Homo sapiens
Mutation(s): No

Deposited: 2011-05-04 Released: 2011-11-02
Deposition Author(s): Carrico, C.T.D., Strong, R.K.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.07 Å
R-Value Free:
0.203 (Depositor), 0.220 (DCC)
R-Value Work:
0.168 (Depositor), 0.200 (DCC)
R-Value Observed:
0.170 (Depositor)

Starting Models: experimental
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wwPDB Validation 3D Report Full Report

This is version 1.4 of the entry. See complete history.

Literature

Computation-guided backbone grafting of a discontinuous motif onto a protein scaffold.

Azoitei, M.L., Correia, B.E., Ban, Y.E., Carrico, C., Kalyuzhniy, O., Chen, L., Schroeter, A., Huang, P.S., McLellan, J.S., Kwong, P.D., Baker, D., Strong, R.K., Schief, W.R.

(2011) Science 334: 373-376

PubMed: 22021856 Search on PubMed
DOI: https://doi.org/10.1126/science.1209368
Primary Citation of Related Structures:
3RPT, 3RU8

PubMed Abstract:
The manipulation of protein backbone structure to control interaction and function is a challenge for protein engineering. We integrated computational design with experimental selection for grafting the backbone and side chains of a two-segment HIV gp120 epitope, targeted by the cross-neutralizing antibody b12, onto an unrelated scaffold protein. The final scaffolds bound b12 with high specificity and with affinity similar to that of gp120, and crystallographic analysis of a scaffold bound to b12 revealed high structural mimicry of the gp120-b12 complex structure. The method can be generalized to design other functional proteins through backbone grafting.

Organizational Affiliation

Department of Biochemistry, University of Washington, Seattle, WA 98195, USA.

Macromolecule Content

Total Structure Weight: 79.06 kDa
Atom Count: 5,881
Modelled Residue Count: 715
Deposited Residue Count: 727
Unique protein chains: 3

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Epitope Scaffold 2bodx43	A [auth X]	282	Human immunodeficiency virus, synthetic construct, Thermobifida fusca This entity is chimeric	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations Expand
Reference Sequence LOADING

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(by identity cutoff) | 3D Structure

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Antibody b12, Heavy Chain	B [auth H]	230	Homo sapiens	Mutation(s): 0
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
Sequence Annotations Expand
Reference Sequence LOADING

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Antibody b12, Light Chain	C [auth L]	215	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P01834 (Homo sapiens) Explore P01834 Go to UniProtKB: P01834
PHAROS: P01834
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P01834
Sequence Annotations Expand
Reference Sequence LOADING

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
GOL Query on GOL Download Ideal Coordinates CCD File SDF format, chain D [auth X] SDF format, chain E [auth X] SDF format, chain F [auth L] SDF format, chain G [auth L] MOL2 format, chain D [auth X] MOL2 format, chain E [auth X] MOL2 format, chain F [auth L] MOL2 format, chain G [auth L] mmCIF format, chain D [auth X] mmCIF format, chain E [auth X] mmCIF format, chain F [auth L] mmCIF format, chain G [auth L]	D [auth X], E [auth X], F [auth L], G [auth L]	GLYCEROL C₃ H₈ O₃ PEDCQBHIVMGVHV-UHFFFAOYSA-N		Interactions Focus chain D [auth X] Focus chain E [auth X] Focus chain F [auth L] Focus chain G [auth L] Interactions & Density Focus chain D [auth X] Focus chain E [auth X] Focus chain F [auth L] Focus chain G [auth L]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.07 Å
R-Value Free: 0.203 (Depositor), 0.220 (DCC)
R-Value Work: 0.168 (Depositor), 0.200 (DCC)
R-Value Observed: 0.170 (Depositor)

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 90.453	α = 90
b = 93.097	β = 90
c = 94.373	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
PHASER	phasing
REFMAC	refinement
PDB_EXTRACT	data extraction

Structure Validation

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Entry History

Deposition Data

Released Date: 2011-11-02

Deposition Author(s):

Carrico, C.T.D.

Strong, R.K.

Revision History (Full details and data files)

Version 1.0: 2011-11-02
Type: Initial release
Version 1.1: 2012-02-22
Changes: Database references
Version 1.2: 2017-11-08
Changes: Refinement description
Version 1.3: 2023-09-13
Changes: Data collection, Database references, Derived calculations, Refinement description
Version 1.4: 2024-11-06
Changes: Structure summary