Biological Assembly 1  

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

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

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

Biological Assembly Evidence: gel filtration

Macromolecule Content

• Total Structure Weight: 80.49 kDa 
• Atom Count: 6166 
• Modelled Residue Count: 740 
• Deposited Residue Count: 748 
• Unique protein chains: 1

6IOI

Crystal structure of Homoserine O-acetyltransferase in complex with CoA from Mycobacterium smegmatis ATCC 19420

• PDB DOI: 10.2210/pdb6IOI/pdb

• Classification: TRANSFERASE
• Organism(s): Mycolicibacterium smegmatis
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 2018-10-30 Released: 2019-09-04 
• Deposition Author(s): Sagong, H.-Y., Kim, K.-J.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.206 
• R-Value Work: 0.181 
• R-Value Observed: 0.182 

Literature

Crystal structure and biochemical characterization of O-acetylhomoserine acetyltransferase from Mycobacterium smegmatis ATCC 19420.

Sagong, H.Y., Hong, J., Kim, K.J.

(2019) Biochem Biophys Res Commun 517: 399-406

• PubMed: 31378370 
• DOI: 10.1016/j.bbrc.2019.07.117
• Primary Citation of Related Structures:  
  6IOG, 6IOH, 6IOI


• PubMed Abstract: 
  

Mycobacterium smegmatis is a good model for studying the physiology and pathogenesis of Mycobacterium tuberculosis due to its genetic similarity. As methionine biosynthesis exists only in microorganisms, the enzymes involved in methionine biosynthesis can be a potential target for novel antibiotics. Homoserine O-acetyltransferase from M. smegmatis (MsHAT) catalyzes the transfer of acetyl-group from acetyl-CoA to homoserine. To investigate the molecular mechanism of MsHAT, we determined its crystal structure in apo-form and in complex with either CoA or homoserine and revealed the substrate binding mode of MsHAT. A structural comparison of MsHAT with other HATs suggests that the conformation of the α5 to α6 region might influence the shape of the dimer. In addition, the active site entrance shows an open or closed conformation and might determine the substrate binding affinity of HATs.

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Organizational Affiliation: 

School of Life Sciences (KNU Creative BioResearch Group), KNU Institute for Microorganisms, Kyungpook National University, Daegu, 41566, Republic of Korea. Electronic address: [e-mail].

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Homoserine O-acetyltransferase	A, B	374	Mycolicibacterium smegmatis	Mutation(s): 0  Gene Names: metX_1, metXA, ERS451418_01697 EC: 2.3.1.31
UniProt
Find proteins for A0QSZ0 (Mycolicibacterium smegmatis (strain ATCC 700084 / mc(2)155)) Explore A0QSZ0  Go to UniProtKB:  A0QSZ0

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
COA	C [auth A], D [auth B]	COENZYME A C21 H36 N7 O16 P3 S RGJOEKWQDUBAIZ-IBOSZNHHSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.60 Å
• R-Value Free: 0.206 
• R-Value Work: 0.181 
• R-Value Observed: 0.182 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.384	α = 90
b = 96.366	β = 90
c = 140.67	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
HKL-2000	data reduction
PDB_EXTRACT	data extraction
HKL-2000	data scaling
MOLREP	phasing

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2018-10-30 
• Released Date: 2019-09-04 
Deposition Author(s): Sagong, H.-Y., Kim, K.-J.

Revision History  

• Version 1.0: 2019-09-04
  Type: Initial release