4ZU6

Crystal Structure of O-Acetylserine Sulfhydrylase from Haemophilus influenzae in complex with pre-reactive o-acetyl serine, alpha-aminoacrylate reaction intermediate and Peptide inhibitor at the resolution of 2.25A

• PDB DOI: https://doi.org/10.2210/pdb4ZU6/pdb
• Entry: 4ZU6 supersedes: 4MH9

• Classification: Transferase/Transferase Inhibitor
• Organism(s): Haemophilus influenzae Rd KW20, Salmonella enterica subsp. enterica serovar Typhimurium str. LT2
• Expression System: Escherichia coli BL21(DE3)
• Mutation(s): No 


• Deposited: 2015-05-15 Released: 2015-06-10 
• Deposition Author(s): Ekka, M.K., Singh, A.K., Kaushik, A., Kumaran, S.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.03 Å
• R-Value Free: 0.230 
• R-Value Work: 0.189 
• R-Value Observed: 0.191 

Starting Model: experimental

Literature

Crystal Structure of O-Acetylserine Sulfhydrylase from Haemophilus inuen-zae in complex with pre-reactive o-acetyl serine and peptide inhibitor

Ekka, M.K., Singh, A.K., Kaushik, A., Kumaran, S.

To be published.

Biological Assembly 1  

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: 36.8 kDa 
• Atom Count: 2,356 
• Modelled Residue Count: 313 
• Deposited Residue Count: 342 
• Unique protein chains: 2

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Cysteine synthase	A [auth X]	332	Haemophilus influenzae Rd KW20	Mutation(s): 0  Gene Names: cysK, HI_1103 EC: 2.5.1.47
UniProt
Find proteins for P45040 (Haemophilus influenzae (strain ATCC 51907 / DSM 11121 / KW20 / Rd)) Explore P45040  Go to UniProtKB:  P45040

Entity ID: 2
Molecule	Chains	Sequence Length	Organism	Details	Image
C-terminal peptide from Serine acetyltransferase	B	10	Salmonella enterica subsp. enterica serovar Typhimurium str. LT2	Mutation(s): 0  EC: 2.3.1.30
UniProt
Find proteins for P29847 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P29847  Go to UniProtKB:  P29847

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PLP	D [auth X]	PYRIDOXAL-5'-PHOSPHATE C8 H10 N O6 P NGVDGCNFYWLIFO-UHFFFAOYSA-N
OAS	C [auth X]	O-ACETYLSERINE C5 H9 N O4 VZXPDPZARILFQX-BYPYZUCNSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.03 Å
• R-Value Free: 0.230 
• R-Value Work: 0.189 
• R-Value Observed: 0.191 
• Space Group: I 4₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 112.634	α = 90
b = 112.634	β = 90
c = 43.49	γ = 90

Software Package:

Software Name	Purpose
PHENIX	refinement
HKL-2000	data reduction
HKL-2000	data scaling
PHASER	phasing

Structure Validation

Entry History 

Deposition Data

• Released Date: 2015-06-10 
Deposition Author(s): Ekka, M.K., Singh, A.K., Kaushik, A., Kumaran, S.
• This entry supersedes: 4MH9

Revision History  

• Version 1.0: 2015-06-10
  Type: Initial release
  
• Version 1.1: 2023-11-08
  Changes: Data collection, Database references, Derived calculations, Refinement description, Source and taxonomy