1B8G | pdb_00001b8g

1-AMINOCYCLOPROPANE-1-CARBOXYLATE SYNTHASE

• PDB DOI: https://doi.org/10.2210/pdb1B8G/pdb

• Classification: LYASE
• Organism(s): Malus domestica
• Expression System: Escherichia coli
• Mutation(s): No 


• Deposited: 1999-01-31 Released: 2000-01-26 
• Deposition Author(s): Capitani, G., Hohenester, E., Feng, L., Storici, P., Kirsch, J.F., Jansonius, J.N.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.37 Å
• R-Value Free: 
  0.242 (Depositor) 
• R-Value Work: 
  0.179 (Depositor), 0.185 (DCC) 

Literature

Structure of 1-aminocyclopropane-1-carboxylate synthase, a key enzyme in the biosynthesis of the plant hormone ethylene.

Capitani, G., Hohenester, E., Feng, L., Storici, P., Kirsch, J.F., Jansonius, J.N.

(1999) J Mol Biology 294: 745-756

• PubMed: 10610793 
• DOI: https://doi.org/10.1006/jmbi.1999.3255
• Primary Citation Related Structures: 
  1B8G


• PubMed Abstract: 
  

  The 2.4 A crystal structure of the vitamin B6-dependent enzyme 1-aminocyclopropane-1-carboxylate (ACC) synthase is described. This enzyme catalyses the committed step in the biosynthesis of ethylene, a plant hormone that is responsible for the initiation of fruit ripening and for regulating many other developmental processes. ACC synthase has 15 % sequence identity with the well-studied aspartate aminotransferase, and a completely different catalytic activity yet the overall folds and the active sites are very similar. The new structure together with available biochemical data enables a comparative mechanistic analysis that largely explains the catalytic roles of the conserved and non-conserved active site residues. An external aldimine reaction intermediate (external aldimine with ACC, i.e. with the product) has been modeled. The new structure provides a basis for the rational design of inhibitors with broad agricultural applications.

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Organizational Affiliation: 
• Structural Biology Division Biozentrum, University of Basel, Basel, CH-4056, Switzerland. [e-mail]

Biological Assembly 1  

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

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

Macromolecule Content 

• Total Structure Weight: 97.02 kDa 
• Atom Count: 6,905 
• Modeled Residue Count: 846 
• Deposited Residue Count: 858 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
PROTEIN (1-AMINOCYCLOPROPANE-1-CARBOXYLATE SYNTHASE)	A, B	429	Malus domestica	Mutation(s): 0  EC: 4.4.1.14 (PDB Primary Data), 1.4 (UniProt)
UniProt
Find proteins for P37821 (Malus domestica) Explore P37821  Go to UniProtKB:  P37821

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
PLP	C [auth A], D [auth B]	PYRIDOXAL-5'-PHOSPHATE C8 H10 N O6 P NGVDGCNFYWLIFO-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.37 Å
• R-Value Free:  0.242 (Depositor) 
• R-Value Work:  0.179 (Depositor), 0.185 (DCC) 

Space Group: P 1 2₁ 1

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 53.63	α = 90
b = 69.06	β = 90.04
c = 123.24	γ = 90

Software Package:

Software Name	Purpose
PHASES	phasing
X-PLOR	refinement
MOSFLM	data reduction
CCP4	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2000-01-26 
Deposition Author(s): Capitani, G., Hohenester, E., Feng, L., Storici, P., Kirsch, J.F., Jansonius, J.N.

Revision History  

• Version 1.0: 2000-01-26
  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