Biological Assembly 1  

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Global Symmetry: Dihedral - D2  (3D View)
Global Stoichiometry: Homo 4-mer - A4 

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

Macromolecule Content

• Total Structure Weight: 167461.73 
• Atom Count: 11691 
• Residue Count: 1544 
• Unique protein chains: 1

1CS1

CYSTATHIONINE GAMMA-SYNTHASE (CGS) FROM ESCHERICHIA COLI

• DOI: 10.2210/pdb1CS1/pdb

• Classification: LYASE
• Organism(s): Escherichia coli (strain K12)
• Expression System: Escherichia coli BL21(DE3)


• Deposited: 1998-09-23 Released: 1999-09-27 
• Deposition Author(s): Clausen, T., Messerschmidt, A.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.5 Å
• R-Value Free: 0.255 
• R-Value Work: 0.200 

Literature

Crystal structure of Escherichia coli cystathionine gamma-synthase at 1.5 A resolution.

Clausen, T., Huber, R., Prade, L., Wahl, M.C., Messerschmidt, A.

(1998) EMBO J. 17: 6827-6838

• PubMed: 9843488 
• DOI: 10.1093/emboj/17.23.6827


• PubMed Abstract: 
  

The transsulfuration enzyme cystathionine gamma-synthase (CGS) catalyses the pyridoxal 5'-phosphate (PLP)-dependent gamma-replacement of O-succinyl-L-homoserine and L-cysteine, yielding L-cystathionine. The crystal structure of the Escherichia coli enzyme has been solved by molecular replacement with the known structure of cystathionine beta-lyase (CBL), and refined at 1.5 A resolution to a crystallographic R-factor of 20.0%. The enzyme crystallizes as an alpha4 tetramer with the subunits related by non-crystallographic 222 symmetry. The spatial fold of the subunits, with three functionally distinct domains and their quaternary arrangement, is similar to that of CBL. Previously proposed reaction mechanisms for CGS can be checked against the structural model, allowing interpretation of the catalytic and substrate-binding functions of individual active site residues. Enzyme-substrate models pinpoint specific residues responsible for the substrate specificity, in agreement with structural comparisons with CBL. Both steric and electrostatic designs of the active site seem to achieve proper substrate selection and productive orientation. Amino acid sequence and structural alignments of CGS and CBL suggest that differences in the substrate-binding characteristics are responsible for the different reaction chemistries. Because CGS catalyses the only known PLP-dependent replacement reaction at Cgamma of certain amino acids, the results will help in our understanding of the chemical versatility of PLP.

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Related Citations: 

• Cloning, Purification, Crystallization and Preliminary Xray-Diffraction Analysis of Cystathionine Gamma-Synthase from Escherichia Coli
  Wahl, M.C.,Huber, R.,Prade, L.,Marinkovic, S.,Messerschmidt, A.,Clausen, T.
  (1997) FEBS Lett. 414: 492




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Organizational Affiliation: 

Max-Planck-Institut für Biochemie, Abteilung Strukturforschung, Am Klopferspitz 18a, 82152 Martinsried, Germany. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
PROTEIN (CYSTATHIONINE GAMMA-SYNTHASE)	A, B, C, D	386	Escherichia coli (strain K12)	Mutation(s): 0  Gene Names: metB EC: 2.5.1.48
Find proteins for P00935 (Escherichia coli (strain K12)) Go to UniProtKB:  P00935

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
DHD	D	2,4-DIOXO-PENTANEDIOIC ACID C5 H4 O6 TVKBBTQJNQDZRU-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
LLP	A, B, C, D	L-PEPTIDE LINKING	C14 H22 N3 O7 P		LYS

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.5 Å
• R-Value Free: 0.255 
• R-Value Work: 0.200 
• Space Group: C 1 2 1

Unit Cell:

Length (Å)	Angle (°)
a = 160.040	α = 90.00
b = 61.300	β = 104.18
c = 153.840	γ = 90.00

Software Package:

Software Name	Purpose
CCP4	data scaling
X-PLOR	refinement
AMoRE	phasing
DENZO	data reduction

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 1998-09-23 
• Released Date: 1999-09-27 
• Deposition Author(s): Clausen, T., Messerschmidt, A.

Revision History 

• Version 1.0: 1999-09-27
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance