1HXB

HIV-1 proteinase complexed with RO 31-8959

• PDB DOI: https://doi.org/10.2210/pdb1HXB/pdb

• Classification: HYDROLASE/HYDROLASE INHIBITOR
• Organism(s): Human immunodeficiency virus type 1 (CLONE 12)
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1996-09-13 Released: 1997-03-12 
• Deposition Author(s): Graves, B.J., Hatada, M.H., Crowther, R.L.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Work: 0.184 
• R-Value Observed: 0.184 

Literature

Novel binding mode of highly potent HIV-proteinase inhibitors incorporating the (R)-hydroxyethylamine isostere.

Krohn, A., Redshaw, S., Ritchie, J.C., Graves, B.J., Hatada, M.H.

(1991) J Med Chem 34: 3340-3342

• PubMed: 1956054 
• DOI: https://doi.org/10.1021/jm00115a028
• Primary Citation of Related Structures:  
  1HXB

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Organizational Affiliation: 

Roche Products Ltd., Welwyn Garden City, Hertfordshire, United Kingdom.

Biological Assembly 1  

Global Symmetry: Cyclic - C2  (Explore in 3D)
Global Stoichiometry: Homo 2-mer - A2 

Biological assembly 1 assigned by authors and generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 22.25 kDa 
• Atom Count: 1,714 
• Modelled Residue Count: 198 
• Deposited Residue Count: 198 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
HIV-1 PROTEASE	A, B	99	Human immunodeficiency virus type 1 (CLONE 12)	Mutation(s): 0  Gene Names: POL EC: 3.4.23.16
UniProt
Find proteins for P04585 (Human immunodeficiency virus type 1 group M subtype B (isolate HXB2)) Explore P04585  Go to UniProtKB:  P04585

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
ROC	C [auth A]	(2S)-N-[(2S,3R)-4-[(2S,3S,4aS,8aS)-3-(tert-butylcarbamoyl)-3,4,4a,5,6,7,8,8a-octahydro-1H-isoquinolin-2-yl]-3-hydroxy-1 -phenyl-butan-2-yl]-2-(quinolin-2-ylcarbonylamino)butanediamide C38 H50 N6 O5 QWAXKHKRTORLEM-UGJKXSETSA-N

Binding Affinity Annotations
ID	Source	Binding Affinity
ROC	BindingDB:  1HXB	Ki: min: 0.06, max: 117 (nM) from 21 assay(s)
		Kd: min: 0.31, max: 67 (nM) from 3 assay(s)
		IC50: min: 0.2, max: 270 (nM) from 12 assay(s)
		-TΔS: min: -7.74e+1, max: -2.80e+1 (kJ/mol) from 38 assay(s)
		ΔH: min: -3.18e+1, max: 40.13 (kJ/mol) from 39 assay(s)
		ΔG: min: -6.23e+1, max: -3.68e+1 (kJ/mol) from 36 assay(s)

Biologically Interesting Molecules (External Reference) 1 Unique

Entity ID: 2
ID	Chains	Name	Type/Class	2D Diagram	3D Interactions
PRD_000454 (ROC)	C [auth A]	Saquinavir	Peptide-like / Inhibitor

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.30 Å
• R-Value Work: 0.184 
• R-Value Observed: 0.184 
• Space Group: P 6₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 63.31	α = 90
b = 63.31	β = 90
c = 83.45	γ = 120

Software Package:

Software Name	Purpose
X-PLOR	model building
X-PLOR	refinement
ADSC	data collection
X-PLOR	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 1997-03-12 
Deposition Author(s): Graves, B.J., Hatada, M.H., Crowther, R.L.

Revision History  

• Version 1.0: 1997-03-12
  Type: Initial release
  
• Version 1.1: 2008-03-24
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Atomic model, Database references, Derived calculations, Non-polymer description, Structure summary, Version format compliance
• Version 1.3: 2013-02-27
  Changes: Other
• Version 1.4: 2024-02-07
  Changes: Data collection, Database references, Derived calculations, Structure summary