Biological Assembly 1  

 3D View: Structure | Electron Density | Ligand Interaction

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Hetero 2-mer - A1B1 

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

Macromolecule Content

• Total Structure Weight: 111.89 kDa 
• Atom Count: 7600 
• Residue Count: 916 
• Unique protein chains: 2

2HNZ

Crystal Structure of E138K Mutant HIV-1 Reverse Transcriptase in Complex with PETT-2

• DOI: 10.2210/pdb2HNZ/pdb

• Classification: TRANSFERASE
• Organism(s): Human immunodeficiency virus 1
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2006-07-13 Released: 2006-09-05 
• Deposition Author(s): Ren, J., Nichols, C.E., Stamp, A., Chamberlain, P.P., Stammers, D.K.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.277 
• R-Value Work: 0.226 
• R-Value Observed: 0.226 

Literature

Structural insights into mechanisms of non-nucleoside drug resistance for HIV-1 reverse transcriptases mutated at codons 101 or 138.

Ren, J., Nichols, C.E., Stamp, A., Chamberlain, P.P., Ferris, R., Weaver, K.L., Short, S.A., Stammers, D.K.

(2006) FEBS J 273: 3850-3860

• PubMed: 16911530 
• DOI: 10.1111/j.1742-4658.2006.05392.x
• Primary Citation of Related Structures:  
  2HND, 2HNZ, 2HNY


• PubMed Abstract: 
  

Lys101Glu is a drug resistance mutation in reverse transcriptase clinically observed in HIV-1 from infected patients treated with the non-nucleoside inhibitor (NNRTI) drugs nevirapine and efavirenz. In contrast to many NNRTI resistance mutations, Lys101(p66 subunit) is positioned at the surface of the NNRTI pocket where it interacts across the reverse transcriptase (RT) subunit interface with Glu138(p51 subunit). However, nevirapine contacts Lys101 and Glu138 only indirectly, via water molecules, thus the structural basis of drug resistance induced by Lys101Glu is unclear. We have determined crystal structures of RT(Glu138Lys) and RT(Lys101Glu) in complexes with nevirapine to 2.5 A, allowing the determination of water structure within the NNRTI-binding pocket, essential for an understanding of nevirapine binding. Both RT(Glu138Lys) and RT(Lys101Glu) have remarkably similar protein conformations to wild-type RT, except for significant movement of the mutated side-chains away from the NNRTI pocket induced by charge inversion. There are also small shifts in the position of nevirapine for both mutant structures which may influence ring stacking interactions with Tyr181. However, the reduction in hydrogen bonds in the drug-water-side-chain network resulting from the mutated side-chain movement appears to be the most significant contribution to nevirapine resistance for RT(Lys101Glu). The movement of Glu101 away from the NNRTI pocket can also explain the resistance of RT(Lys101Glu) to efavirenz but in this case is due to a loss of side-chain contacts with the drug. RT(Lys101Glu) is thus a distinctive NNRTI resistance mutant in that it can give rise to both direct and indirect mechanisms of drug resistance, which are inhibitor-dependent.

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Organizational Affiliation: 

Division of Structural Biology, The Wellcome Trust Centre for Human Genetics, Henry Wellcome Building for Genomic Medicine, University of Oxford, UK.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Reverse transcriptase/ribonuclease H	A	534	Human immunodeficiency virus 1	Mutation(s): 2  Gene Names: GAG EC: 2.7.7.49 (PDB Primary Data), 3.4.23.16 (UniProt), 2.7.7.7 (UniProt), 3.1.26.13 (UniProt), 3.1.13.2 (UniProt), 2.7.7 (UniProt), 3.1 (UniProt)
Find proteins for P04585 (Human immunodeficiency virus type 1 group M subtype B (isolate HXB2)) Explore P04585  Go to UniProtKB:  P04585

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
Reverse transcriptase/ribonuclease H	B	422	Human immunodeficiency virus 1	Mutation(s): 1  Gene Names: GAG EC: 2.7.7.49 (PDB Primary Data), 3.4.23.16 (UniProt), 2.7.7.7 (UniProt), 3.1.26.13 (UniProt), 3.1.13.2 (UniProt), 2.7.7 (UniProt), 3.1 (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 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PC0	A	1-[2-(4-ETHOXY-3-FLUOROPYRIDIN-2-YL)ETHYL]-3-(5-METHYLPYRIDIN-2-YL)THIOUREA C16 H19 F N4 O S QOVMZMFNTIUFLU-UHFFFAOYSA-N
PO4	A	PHOSPHATE ION O4 P NBIIXXVUZAFLBC-UHFFFAOYSA-K

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSD	A	L-PEPTIDE LINKING	C3 H7 N O4 S		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 3.00 Å
• R-Value Free: 0.277 
• R-Value Work: 0.226 
• R-Value Observed: 0.226 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 138.8	α = 90
b = 114.9	β = 90
c = 65.9	γ = 90

Software Package:

Software Name	Purpose
CNS	refinement
DENZO	data reduction
SCALEPACK	data scaling
CNS	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2006-07-13 
• Released Date: 2006-09-05 
Deposition Author(s): Ren, J., Nichols, C.E., Stamp, A., Chamberlain, P.P., Stammers, D.K.

Revision History 

• Version 1.0: 2006-09-05
  Type: Initial release
  
• Version 1.1: 2008-05-01
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Version format compliance