Biological Assembly 1  

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

Global Symmetry: Asymmetric - C1 
Global Stoichiometry: Monomer - A1 

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 42.20 kDa 
• Atom Count: 3247 
• Modelled Residue Count: 357 
• Deposited Residue Count: 367 
• Unique protein chains: 1

1IUQ

The 1.55 A Crystal Structure of Glycerol-3-Phosphate Acyltransferase

• PDB DOI: 10.2210/pdb1IUQ/pdb

• Classification: TRANSFERASE
• Organism(s): Cucurbita moschata
• Expression System: Escherichia coli
• Mutation(s): Yes 


• Deposited: 2002-03-06 Released: 2003-10-07 
• Deposition Author(s): Tamada, T., Feese, M.D., Kato, Y., Kuroki, R.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.219 
• R-Value Work: 0.201 
• R-Value Observed: 0.202 

Literature

Substrate recognition and selectivity of plant glycerol-3-phosphate acyltransferases (GPATs) from Cucurbita moscata and Spinacea oleracea.

Tamada, T., Feese, M.D., Ferri, S.R., Kato, Y., Yajima, R., Toguri, T., Kuroki, R.

(2004) Acta Crystallogr D Biol Crystallogr 60: 13-21

• PubMed: 14684887 
• DOI: 10.1107/s0907444903020778
• Primary Citation of Related Structures:  
  1IUQ


• PubMed Abstract: 
  

Stromal glycerol-3-phosphate acyltransferases (GPAT) are responsible for the selective incorporation of saturated and unsaturated fatty-acyl chains into chloroplast membranes, which is an important determinant of a plant's ability to tolerate chilling temperatures. The molecular mechanisms of plant chilling tolerance were elucidated by creating chimeric GPATs between squash (Cucurbita moscata, chilling-sensitive) and spinach (Spinacea oleracea, chilling-tolerant) and the results were interpreted using structural information on squash GPAT determined by X-ray crystallography at 1.55 A resolution. Enzymatic analysis of the chimeric GPATs showed that the chimeric GPATs containing the spinach region from residues 128 to 187 prefer the 18:1 unsaturated fatty acid rather than 16:0 saturated fatty acid. Structure analysis suggests that the size and character of the cavity that is formed from this region determines the specific recognition of acyl chains.

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Organizational Affiliation: 

Central Laboratories for Key Technology, Kirin Brewery Co. Ltd, Fukuura 1-13-5, Kanazawa-ku, Yokohama 236-0004, Japan.

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Glycerol-3-Phosphate Acyltransferase	A	367	Cucurbita moschata	Mutation(s): 7  Gene Names: ATS1;2, AT2 EC: 2.3.1.15 (PDB Primary Data), 2.3.1 (UniProt)
UniProt
Find proteins for P10349 (Cucurbita moschata) Explore P10349  Go to UniProtKB:  P10349

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
SO4	B [auth A], C [auth A], D [auth A], E [auth A], F [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
GOL	G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], L [auth A]	GLYCEROL C3 H8 O3 PEDCQBHIVMGVHV-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
MSE	A	L-PEPTIDE LINKING	C5 H11 N O2 Se		MET

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 1.55 Å
• R-Value Free: 0.219 
• R-Value Work: 0.201 
• R-Value Observed: 0.202 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 58.138	α = 90
b = 63.604	β = 90
c = 115.862	γ = 90

Software Package:

Software Name	Purpose
DENZO	data reduction
SCALEPACK	data scaling
MLPHARE	phasing
REFMAC	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2002-03-06 
• Released Date: 2003-10-07 
Deposition Author(s): Tamada, T., Feese, M.D., Kato, Y., Kuroki, R.

Revision History  

• Version 1.0: 2003-10-07
  Type: Initial release
  
• Version 1.1: 2008-04-27
  Changes: Version format compliance
• Version 1.2: 2011-07-13
  Changes: Non-polymer description, Version format compliance