Biological Assembly 1  

 3D View: Structure | Electron Density

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 generated by PISA (software)

Macromolecule Content

• Total Structure Weight: 29.59 kDa 
• Atom Count: 2083 
• Residue Count: 260 
• Unique protein chains: 1

4CS6

Crystal structure of AadA - an aminoglycoside adenyltransferase

• DOI: 10.2210/pdb4CS6/pdb

• Classification: TRANSFERASE
• Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium str. LT2
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2014-03-05 Released: 2015-03-25 
• Deposition Author(s): Chen, Y., Nasvall, J., Andersson, D.I., Selmer, M.

---

Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.252 
• R-Value Work: 0.194 
• R-Value Observed: 0.196 

Literature

Structure of Aada from Salmonella Enterica: A Monomeric Aminoglycoside (3'')(9) Adenyltransferase.

Chen, Y., Nasvall, J., Wu, S., Andersson, D.I., Selmer, M.

(2015) Acta Crystallogr D Biol Crystallogr 71: 2267

• PubMed: 26527143 
• DOI: 10.1107/S1399004715016429
• Primary Citation of Related Structures:  
  4CS6


• PubMed Abstract: 
  

Aminoglycoside resistance is commonly conferred by enzymatic modification of drugs by aminoglycoside-modifying enzymes such as aminoglycoside nucleotidyltransferases (ANTs). Here, the first crystal structure of an ANT(3'')(9) adenyltransferase, AadA from Salmonella enterica, is presented. AadA catalyses the magnesium-dependent transfer of adenosine monophosphate from ATP to the two chemically dissimilar drugs streptomycin and spectinomycin. The structure was solved using selenium SAD phasing and refined to 2.5 Å resolution. AadA consists of a nucleotidyltransferase domain and an α-helical bundle domain. AadA crystallizes as a monomer and is a monomer in solution as confirmed by small-angle X-ray scattering, in contrast to structurally similar homodimeric adenylating enzymes such as kanamycin nucleotidyltransferase. Isothermal titration calorimetry experiments show that ATP binding has to occur before binding of the aminoglycoside substrate, and structure analysis suggests that ATP binding repositions the two domains for aminoglycoside binding in the interdomain cleft. Candidate residues for ligand binding and catalysis were subjected to site-directed mutagenesis. In vivo resistance and in vitro binding assays support the role of Glu87 as the catalytic base in adenylation, while Arg192 and Lys205 are shown to be critical for ATP binding.

---

Organizational Affiliation: 

Department of Cell and Molecular Biology, Uppsala University, Biomedical Center, Box 596, SE-751 24 Uppsala, Sweden.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
AMINOGLYCOSIDE ADENYLTRANSFERASE	A	264	Salmonella enterica subsp. enterica serovar Typhimurium str. LT2	Mutation(s): 0  Gene Names: aadA, STM1264 EC: 2.7.7.47
Find proteins for Q8ZPX9 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore Q8ZPX9  Go to UniProtKB:  Q8ZPX9

Small Molecules

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
CSS	A	L-PEPTIDE LINKING	C3 H7 N O2 S2		CYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.50 Å
• R-Value Free: 0.252 
• R-Value Work: 0.194 
• R-Value Observed: 0.196 
• Space Group: P 2₁ 2 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 48.658	α = 90
b = 58.642	β = 90
c = 104.587	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
XDS	data reduction
XSCALE	data scaling
PHENIX	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2014-03-05 
• Released Date: 2015-03-25 
Deposition Author(s): Chen, Y., Nasvall, J., Andersson, D.I., Selmer, M.

Revision History 

• Version 1.0: 2015-03-25
  Type: Initial release
  
• Version 1.1: 2015-11-11
  Changes: Database references