Biological Assembly 1  

 3D View: Structure | 1D-3D View | Electron Density | Validation Report | Ligand Interaction

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

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

Macromolecule Content

• Total Structure Weight: 30.99 kDa 
• Atom Count: 2477 
• Modelled Residue Count: 281 
• Deposited Residue Count: 281 
• Unique protein chains: 1

3SBM

Trans-acting transferase from Disorazole synthase in complex with Acetate

• PDB DOI: 10.2210/pdb3SBM/pdb

• Classification: TRANSFERASE
• Organism(s): Sorangium cellulosum
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2011-06-06 Released: 2011-07-13 
• Deposition Author(s): Khosla, C., Mathews, I.I., Wong, F.T., Jin, X.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.35 Å
• R-Value Free: 0.174 
• R-Value Work: 0.161 
• R-Value Observed: 0.162 

Literature

Structure and Mechanism of the trans-Acting Acyltransferase from the Disorazole Synthase.

Wong, F.T., Jin, X., Mathews, I.I., Cane, D.E., Khosla, C.

(2011) Biochemistry 50: 6539-6548

• PubMed: 21707057 
• DOI: 10.1021/bi200632j
• Primary Citation of Related Structures:  
  3RGI, 3SBM


• PubMed Abstract: 
  

The 1.51 Å resolution X-ray crystal structure of the trans-acyltransferase (AT) from the "AT-less" disorazole synthase (DSZS) and that of its acetate complex at 1.35 Å resolution are reported. Separately, comprehensive alanine-scanning mutagenesis of one of its acyl carrier protein substrates (ACP1 from DSZS) led to the identification of a conserved Asp45 residue on the ACP, which contributes to the substrate specificity of this unusual enzyme. Together, these experimental findings were used to derive a model for the selective association of the DSZS AT and its ACP substrate. With a goal of structurally characterizing the AT-ACP interface, a strategy was developed for covalently cross-linking the active site Ser → Cys mutant of the DSZS AT to its ACP substrate and for purifying the resulting AT-ACP complex to homogeneity. The S86C DSZS AT mutant was found to be functional, albeit with a transacylation efficiency 200-fold lower than that of its wild-type counterpart. Our findings provide new insights as well as new opportunities for high-resolution analysis of an important protein-protein interface in polyketide synthases.

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Organizational Affiliation: 

Department of Chemical Engineering, Department of Chemistry, and §Department of Biochemistry, Stanford University , Stanford, California 94305, United States.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
DisD protein	A	281	Sorangium cellulosum	Mutation(s): 0  Gene Names: dszD, disD EC: 2.3.1.39
UniProt
Find proteins for Q4U443 (Sorangium cellulosum) Explore Q4U443  Go to UniProtKB:  Q4U443

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
P6G	E [auth A]	HEXAETHYLENE GLYCOL C12 H26 O7 IIRDTKBZINWQAW-UHFFFAOYSA-N
ACT	B [auth A], C [auth A], D [auth A]	ACETATE ION C2 H3 O2 QTBSBXVTEAMEQO-UHFFFAOYSA-M

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.35 Å
• R-Value Free: 0.174 
• R-Value Work: 0.161 
• R-Value Observed: 0.162 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 43.03	α = 90
b = 54.01	β = 90
c = 120.71	γ = 90

Software Package:

Software Name	Purpose
Blu-Ice	data collection
REFMAC	refinement
XDS	data reduction
XDS	data scaling

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2011-06-06 
• Released Date: 2011-07-13 
Deposition Author(s): Khosla, C., Mathews, I.I., Wong, F.T., Jin, X.

Revision History  

• Version 1.0: 2011-07-13
  Type: Initial release
  
• Version 1.1: 2011-08-24
  Changes: Database references
• Version 1.2: 2017-11-08
  Changes: Refinement description