1OAS | pdb_00001oas

O-ACETYLSERINE SULFHYDRYLASE FROM SALMONELLA TYPHIMURIUM

PDB DOI: https://doi.org/10.2210/pdb1OAS/pdb

Classification: LYASE
Organism(s): Salmonella enterica subsp. enterica serovar Typhimurium
Expression System: Salmonella enterica subsp. enterica serovar Typhimurium
Mutation(s): No

Deposited: 1999-01-29 Released: 2000-01-28
Deposition Author(s): Burkhard, P., Rao, G.S.J., Hohenester, E., Schnackerz, K.D., Cook, P.F., Jansonius, J.N.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.20 Å
R-Value Free:
0.200 (Depositor), 0.201 (DCC)
R-Value Work:
0.172 (Depositor), 0.173 (DCC)

wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.3 of the entry. See complete history.

Literature

Three-dimensional structure of O-acetylserine sulfhydrylase from Salmonella typhimurium.

Burkhard, P., Rao, G.S., Hohenester, E., Schnackerz, K.D., Cook, P.F., Jansonius, J.N.

(1998) J Mol Biology 283: 121-133

PubMed: 9761678 Search on PubMed
DOI: https://doi.org/10.1006/jmbi.1998.2037
Primary Citation Related Structures:
1OAS

PubMed Abstract:
The last step in cysteine biosynthesis in enteric bacteria is catalyzed by the pyridoxal 5'-phosphate-dependent enzyme O-acetylserine sulfhydrylase. Here we report the crystal structure at 2.2 A resolution of the A-isozyme of O-acetylserine sulfhydrylase isolated from Salmonella typhimurium. O-acetylserine sulfhydrylase shares the same fold with tryptophan synthase-beta from Salmonella typhimurium but the sequence identity level is below 20%. There are some major structural differences: the loops providing the interface to the alpha-subunit in tryptophan synthase-beta and two surface helices of tryptophan synthase-beta are missing in O-acetylserine sulfhydrylase. The hydrophobic channel for indole transport from the alpha to the beta active site of tryptophan synthase-beta is, not unexpectedly, also absent in O-acetylserine sulfhydrylase. The dimer interface, on the other hand, is more or less conserved in the two enzymes. The active site cleft of O-acetylserine sulfhydrylase is wider and therefore more exposed to the solvent. A possible binding site for the substrate O-acetylserine is discussed.

Organizational Affiliation

Department of Structural Biology, Biozentrum, University of Basel, Klingelbergstrasse70, Basel, CH-4056, Switzerland.

Macromolecule Content

Total Structure Weight: 69.44 kDa
Atom Count: 5,158
Modeled Residue Count: 630
Deposited Residue Count: 644
Unique protein chains: 1

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
O-ACETYLSERINE SULFHYDRYLASE	A, B	322	Salmonella enterica subsp. enterica serovar Typhimurium	Mutation(s): 0 EC: 4.2.99.8 (PDB Primary Data), 2.5.1.47 (UniProt)
UniProt
Find proteins for P0A1E3 (Salmonella typhimurium (strain LT2 / SGSC1412 / ATCC 700720)) Explore P0A1E3 Go to UniProtKB: P0A1E3
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P0A1E3
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
PLP Query on PLP Download:Ideal Coordinates CCD File SDF format, chain D [auth B] SDF format, chain C [auth A] MOL2 format, chain D [auth B] MOL2 format, chain C [auth A] mmCIF format, chain D [auth B] mmCIF format, chain C [auth A]	C [auth A], D [auth B]	PYRIDOXAL-5'-PHOSPHATE C₈ H₁₀ N O₆ P NGVDGCNFYWLIFO-UHFFFAOYSA-N		Interactions Focus chain C [auth A] Focus chain D [auth B] Interactions & Density Focus chain C [auth A] Focus chain D [auth B]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 2.20 Å
R-Value Free: 0.200 (Depositor), 0.201 (DCC)
R-Value Work: 0.172 (Depositor), 0.173 (DCC)

Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 54.6	α = 90
b = 98.2	β = 90
c = 145.4	γ = 90

Software Package:

Software Name	Purpose
MLPHARE	phasing
CNS	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

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Ligand Structure Quality Assessment

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Entry History

Deposition Data

Released Date: 2000-01-28

Deposition Author(s):

Revision History (Full details and data files)

Version 1.0: 2000-01-28
Type: Initial release
Version 1.1: 2007-10-16
Changes: Version format compliance
Version 1.2: 2011-07-13
Changes: Derived calculations, Version format compliance
Version 1.3: 2023-12-27
Changes: Data collection, Database references, Derived calculations