3AC4

Crystal structure of triazolo pyrimidine derivative bound to the kinase domain of human LCK, (auto-phosphorylated on TYR394)

• PDB DOI: https://doi.org/10.2210/pdb3AC4/pdb

• Classification: TRANSFERASE
• Organism(s): Homo sapiens
• Expression System: Spodoptera frugiperda
• Mutation(s): No 


• Deposited: 2009-12-28 Released: 2010-06-30 
• Deposition Author(s): Tsuji, E.

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Experimental Data Snapshot

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.283 
• R-Value Work: 0.203 
• R-Value Observed: 0.211 

Starting Model: experimental

Literature

Ab initio fragment molecular orbital study of ligand binding to leukocyte-specific protein tyrosine (LCK) kinase

Ozawa, M., Ozawa, T., Tsuji, E., Okazaki, K., Takeda, K.

To be published.

Biological Assembly 1  

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

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

Macromolecule Content

• Total Structure Weight: 33.74 kDa 
• Atom Count: 2,347 
• Modelled Residue Count: 272 
• Deposited Residue Count: 285 
• Unique protein chains: 1

Macromolecules

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Proto-oncogene tyrosine-protein kinase LCK	A	285	Homo sapiens	Mutation(s): 0  Gene Names: LCK EC: 2.7.10.2
UniProt & NIH Common Fund Data Resources
Find proteins for P06239 (Homo sapiens) Go to UniProtKB:  P06239
PHAROS:  P06239 GTEx:  ENSG00000182866

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram
KZL	E [auth A]	5-[(2-amino-1,1-dimethylethyl)amino]-7-[(3,5-dimethoxyphenyl)amino][1,2,4]triazolo[4,3-c]pyrimidine-8-carboxamide C18 H24 N8 O3 AEEITZXNPLOKQJ-UHFFFAOYSA-N
SO4	B [auth A], C [auth A]	SULFATE ION O4 S QAOWNCQODCNURD-UHFFFAOYSA-L
DMS	D [auth A]	DIMETHYL SULFOXIDE C2 H6 O S IAZDPXIOMUYVGZ-UHFFFAOYSA-N

Modified Residues  1 Unique
ID	Chains	Type	Formula	2D Diagram	Parent
PTR	A	L-PEPTIDE LINKING	C9 H12 N O6 P		TYR

Binding Affinity Annotations
ID	Source	Binding Affinity
PTR	BindingDB:  3AC4	Kd: 4.00e+5 (nM) from 1 assay(s)

Experimental Data & Validation

Experimental Data

• Method: X-RAY DIFFRACTION
• Resolution: 2.70 Å
• R-Value Free: 0.283 
• R-Value Work: 0.203 
• R-Value Observed: 0.211 
• Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 42.267	α = 90
b = 73.64	β = 90
c = 93.098	γ = 90

Software Package:

Software Name	Purpose
BSS	data collection
AMoRE	phasing
REFMAC	refinement
MOSFLM	data reduction
SCALA	data scaling

Structure Validation

Entry History 

Deposition Data

• Released Date: 2010-06-30 
Deposition Author(s): Tsuji, E.

Revision History  

• Version 1.0: 2010-06-30
  Type: Initial release
  
• Version 1.1: 2011-07-13
  Changes: Version format compliance
• Version 1.2: 2023-11-01
  Changes: Data collection, Database references, Derived calculations, Refinement description
• Version 1.3: 2023-11-15
  Changes: Data collection
• Version 1.4: 2024-10-30
  Changes: Structure summary