Biological Assembly 1  

 3D View: Structure | Ligand Interaction

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

Biological assembly 1 assigned by authors.

Macromolecule Content

• Total Structure Weight: 13451.12 
• Atom Count: 928 
• Residue Count: 118 
• Unique protein chains: 1

1TC8

Crystal structure of Krait-venom phospholipase A2 in a complex with a natural fatty acid tridecanoic acid

• DOI: 10.2210/pdb1TC8/pdb

• Classification: TOXIN
• Organism(s): Bungarus caeruleus


• Deposited: 2004-05-21 Released: 2004-06-08 
• Deposition Author(s): Singh, G., Jasti, J., Saravanan, K., Sharma, S., Kaur, P., Srinivasan, A., Singh, T.P.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.7 Å
• R-Value Free: 0.233 
• R-Value Work: 0.204 

Literature

Crystal structure of the complex formed between a group I phospholipase A2 and a naturally occurring fatty acid at 2.7 A resolution

Singh, G., Jasti, J., Saravanan, K., Sharma, S., Kaur, P., Srinivasan, A., Singh, T.P.

(2005) PROTEIN SCI. 14: 395-400

• PubMed: 15659372 
• DOI: 10.1110/ps.041115505


• PubMed Abstract: 
  

This is the first evidence of a naturally bound fatty acid to a group I Phospholipase A(2) (PLA(2)) and also to a PLA(2) with Asp 49. The fatty acid identified as n-tridecanoic acid is observed at the substrate recognition site of PLA(2) hydrophobic channel. The complex was isolated from the venom of Bungarus caeruleus (Common Indian Krait). The primary sequence of the PLA(2) was determined using the cDNA method. Three-dimensional structure has been solved by the molecular replacement method and refined using the CNS package to a final R factor of 19.8% for the data in the resolution range from 20.0 to 2.7 A. The final refined model is comprised of 912 protein atoms, one sodium ion, one molecule of n-tridecanoic acid, and 60 water molecules. The sodium ion is located in the calcium-binding loop with a sevenfold coordination. A characteristic extra electron density was observed in the hydrophobic channel of the enzyme, into which a molecule of n-tridecanoic acid was clearly fitted. The MALDI-TOF measurements of the crystals had earlier indicated an increase in the molecular mass of PLA(2) by 212 Da over the native PLA(2). A major part of the ligand fits well in the binding pocket and interacts directly with His 48 and Asp 49. Although the overall structure of PLA(2) in the present complex is similar to the native structure reported earlier, it differs significantly in the folding of its calcium-binding loop.

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Organizational Affiliation: 

Department of Biophysics, All India Institute of Medical Sciences, Ansari Nagar, New Delhi, 110029, India. [e-mail].

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
phospholipase A2 isoform 1	A	118	Bungarus caeruleus	Mutation(s): 0  EC: 3.1.1.4
Find proteins for Q6SLM2 (Bungarus caeruleus) Go to UniProtKB:  Q6SLM2

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram & Interactions
NA	A	SODIUM ION Na FKNQFGJONOIPTF-UHFFFAOYSA-N
TDA	A	N-TRIDECANOIC ACID C13 H26 O2 SZHOJFHSIKHZHA-UHFFFAOYSA-N

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.7 Å
• R-Value Free: 0.233 
• R-Value Work: 0.204 
• Space Group: P 4₁ 2₁ 2

Unit Cell:

Length (Å)	Angle (°)
a = 53.790	α = 90.00
b = 53.790	β = 90.00
c = 82.500	γ = 90.00

Software Package:

Software Name	Purpose
AMoRE	phasing
DENZO	data reduction
SCALEPACK	data scaling
CNS	refinement

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2004-05-21 
• Released Date: 2004-06-08 
• Deposition Author(s): Singh, G., Jasti, J., Saravanan, K., Sharma, S., Kaur, P., Srinivasan, A., Singh, T.P.

Revision History 

• Version 1.0: 2004-06-08
  Type: Initial release
• Version 1.1: 2008-04-30
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance