Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 22366.47 
• Atom Count: 1570 
• Residue Count: 198 
• Unique protein chains: 1

1A9M

G48H MUTANT OF HIV-1 PROTEASE IN COMPLEX WITH A PEPTIDIC INHIBITOR U-89360E

• DOI: 10.2210/pdb1A9M/pdb

• Classification: ASPARTYL PROTEASE
• Organism(s): Human immunodeficiency virus type 1 group M subtype B
• Expression System: Escherichia coli BL21
• Mutation(s): 1 


• Deposited: 1998-04-08 Released: 1998-06-17 
• Deposition Author(s): Hong, L., Zhang, X.-J., Foundling, S., Hartsuck, J.A., Tang, J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Work: 0.185 

Literature

Structure of a G48H mutant of HIV-1 protease explains how glycine-48 replacements produce mutants resistant to inhibitor drugs.

Hong, L., Zhang, X.J., Foundling, S., Hartsuck, J.A., Tang, J.

(1997) FEBS Lett. 420: 11-16

• PubMed: 9450540 


• PubMed Abstract: 
  

The crystal structure of human immunodeficiency virus type 1 (HIV-1) protease mutant G48H with peptidic inhibitor U-89360E is described. Comparison with wild-type protease-inhibitor complex shows that mutation of flap residue 48 to histidine allows stabilizing van der Waals contacts between the side chains of His48 and Phe53 as well as between His48 and the P2' and P3' inhibitor subsites. The flap region is less mobile than in the wild-type enzyme. A model of saquinavir-resistant mutant protease G48V in complex with saquinavir predicts interactions similar to those found in the G48H crystal. Energetic calculations confirm the similarity of the His48 and Val48 interactions.

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Organizational Affiliation: 

Protein Studies Program, Oklahoma Medical Research Foundation, Oklahoma City 73104, USA.

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
HIV-1 PROTEASE	A, B	99	Human immunodeficiency virus type 1 group M subtype B	Mutation(s): 1  Gene Names: gag-pol
Find proteins for P03366 (Human immunodeficiency virus type 1 group M subtype B) Go to UniProtKB:  P03366

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
U0E	B	N-[[1-[N-ACETAMIDYL]-[1-CYCLOHEXYLMETHYL-2-HYDROXY-4-ISOPROPYL]-BUT-4-YL]-CARBONYL]-GLUTAMINYL-ARGINYL-AMIDE C28 H52 N8 O6 XTOQWMLQBSGKOK-VUBDRERZSA-N

External Ligand Annotations
ID	Binding Affinity (Sequence Identity %)
U0E	Ki: 119 nM BINDINGMOAD
U0E	Ki: 119 nM PDBBIND

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.3 Å
• R-Value Work: 0.185 
• Space Group: I 2 2 2

Unit Cell:

Length (Å)	Angle (°)
a = 58.500	α = 90.00
b = 88.200	β = 90.00
c = 94.200	γ = 90.00

Software Package:

Software Name	Purpose
SAINT	data reduction
X-PLOR	refinement
X-PLOR	phasing
X-PLOR	model building
SAINT	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-04-08 
• Released Date: 1998-06-17 
• Deposition Author(s): Hong, L., Zhang, X.-J., Foundling, S., Hartsuck, J.A., Tang, J.

Revision History 

• Version 1.0: 1998-06-17
  Type: Initial release
• Version 1.1: 2008-03-03
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance