5VBX

Crystal structure of holo-[acyl-carrier-protein] synthase (AcpS) from Escherichia coli


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 

wwPDB Validation   3D Report Full Report


This is version 1.3 of the entry. See complete history


Literature

Structure, High Affinity, and Negative Cooperativity of the Escherichia coli Holo-(Acyl Carrier Protein):Holo-(Acyl Carrier Protein) Synthase Complex.

Marcella, A.M.Culbertson, S.J.Shogren-Knaak, M.A.Barb, A.W.

(2017) J Mol Biol 429: 3763-3775

  • DOI: 10.1016/j.jmb.2017.10.015
  • Primary Citation of Related Structures:  
    5VBX, 5VCB

  • PubMed Abstract: 
  • The Escherichia coli holo-(acyl carrier protein) synthase (ACPS) catalyzes the coenzyme A-dependent activation of apo-ACPP to generate holo-(acyl carrier protein) (holo-ACPP) in an early step of fatty acid biosynthesis. E. coli ACPS is sufficiently d ...

    The Escherichia coli holo-(acyl carrier protein) synthase (ACPS) catalyzes the coenzyme A-dependent activation of apo-ACPP to generate holo-(acyl carrier protein) (holo-ACPP) in an early step of fatty acid biosynthesis. E. coli ACPS is sufficiently different from the human fatty acid synthase to justify the development of novel ACPS-targeting antibiotics. Models of E. coli ACPS in unliganded and holo-ACPP-bound forms solved by X-ray crystallography to 2.05and 4.10Å, respectively, revealed that ACPS bound three product holo-ACPP molecules to form a 3:3 hexamer. Solution NMR spectroscopy experiments validated the ACPS binding interface on holo-ACPP using chemical shift perturbations and by determining the relative orientation of holo-ACPP to ACPS by fitting residual dipolar couplings. The binding interface is organized to arrange contacts between positively charged ACPS residues and the holo-ACPP phosphopantetheine moiety, indicating product contains more stabilizing interactions than expected in the enzyme:substrate complex. Indeed, holo-ACPP bound the enzyme with greater affinity than the substrate, apo-ACPP, and with negative cooperativity. The first equivalent of holo-ACPP bound with a K D =62±13nM, followed by the binding of two more equivalents of holo-ACPP with K D =1.2±0.2μM. Cooperativity was not observed for apo-ACPP which bound with K D =2.4±0.1μM. Strong product binding and high levels of holo-ACPP in the cell identify a potential regulatory role of ACPS in fatty acid biosynthesis.


    Organizational Affiliation

    Roy J. Carver Department of Biochemistry, Biophysics and Molecular Biology, 2437 Pammel Drive, Molecular Biology Building, rm 4210, Iowa State University, Ames, IA 50011, United States. Electronic address: abarb@iastate.edu.



Macromolecules
Find similar proteins by:  (by identity cutoff)  |  Structure
Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
Holo-[acyl-carrier-protein] synthaseABC126Escherichia coli K-12Mutation(s): 0 
Gene Names: acpSdpjb2563JW2547
EC: 2.7.8.7
Find proteins for P24224 (Escherichia coli (strain K12))
Explore P24224 
Go to UniProtKB:  P24224
Protein Feature View
Expand
  • Reference Sequence
Small Molecules
Ligands 2 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
EDO
Query on EDO

Download CCD File 
A, B, C
1,2-ETHANEDIOL
C2 H6 O2
LYCAIKOWRPUZTN-UHFFFAOYSA-N
 Ligand Interaction
NA
Query on NA

Download CCD File 
A, B, C
SODIUM ION
Na
FKNQFGJONOIPTF-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.05 Å
  • R-Value Free: 0.242 
  • R-Value Work: 0.192 
  • R-Value Observed: 0.194 
  • Space Group: C 1 2 1
Unit Cell:
Length ( Å )Angle ( ˚ )
a = 100.376α = 90
b = 69.522β = 109.55
c = 59.894γ = 90
Software Package:
Software NamePurpose
PHENIXrefinement
HKL-2000data reduction
HKL-2000data scaling
PHENIXphasing

Structure Validation

View Full Validation Report



Entry History & Funding Information

Deposition Data


Funding OrganizationLocationGrant Number
National Science Foundation (NSF, United States)United StatesEEC-0813570
Argonne National Laboratory (Beam time)United StatesGUP-48455

Revision History 

  • Version 1.0: 2017-11-01
    Type: Initial release
  • Version 1.1: 2017-11-29
    Changes: Database references
  • Version 1.2: 2019-01-09
    Changes: Data collection, Derived calculations
  • Version 1.3: 2019-11-27
    Changes: Author supporting evidence