2Q8T

Crystal Structure of the CC chemokine CCL14


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.23 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.187 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Structural and Functional Characterization of CC Chemokine CCL14

Blain, K.Y.Kwiatkowski, W.Zhao, Q.La Fleur, D.Naik, C.Chun, T.-W.Tsareva, T.Kanakaraj, P.Laird, M.W.Shah, R.George, L.Sanyal, I.Moore, P.A.Demeler, B.Choe, S.

(2007) Biochemistry 46: 10008-10015

  • DOI: 10.1021/bi700936w
  • Primary Citation of Related Structures:  

  • PubMed Abstract: 
  • CC chemokine ligand 14, CCL14, is a human CC chemokine that is of recent interest because of its natural ability, upon proteolytic processing of the first eight NH2-terminal residues, to bind to and signal through the human immunodeficiency virus typ ...

    CC chemokine ligand 14, CCL14, is a human CC chemokine that is of recent interest because of its natural ability, upon proteolytic processing of the first eight NH2-terminal residues, to bind to and signal through the human immunodeficiency virus type-1 (HIV-1) co-receptor, CC chemokine receptor 5 (CCR5). We report X-ray crystallographic structures of both full-length CCL14 and signaling-active, truncated CCL14 [9-74] determined at 2.23 and 1.8 A, respectively. Although CCL14 and CCL14 [9-74] differ in their ability to bind CCR5 for biological signaling, we find that the NH2-terminal eight amino acids (residues 1 through 8) are completely disordered in CCL14 and both show the identical mode of the dimeric assembly characteristic of the CC type chemokine structures. However, analytical ultracentrifugation studies reveal that the CCL14 is stable as a dimer at a concentration as low as 100 nM, whereas CCL14 [9-74] is fully monomeric at the same concentration. By the same method, the equilibrium between monomers of CCL14 [9-74] and higher order oligomers is estimated to be of EC1,4 = 4.98 microM for monomer-tetramer conversion. The relative instability of CCL14 [9-74] oligomers as compared to CCL14 is also reflected in the Kd's that are estimated by the surface plasmon resonance method to be approximately 9.84 and 667 nM for CCL14 and CCL14 [9-74], respectively. This approximately 60-fold difference in stability at a physiologically relevant concentration can potentially account for their different signaling ability. Functional data from the activity assays by intracellular calcium flux and inhibition of CCR5-mediated HIV-1 entry show that only CCL14 [9-74] is fully active at these near-physiological concentrations where CCL14 [9-74] is monomeric and CCL14 is dimeric. These results together suggest that the ability of CCL14 [9-74] to monomerize can play a role for cellular activation.


    Organizational Affiliation

    Structural Biology Laboratory, The Salk Institute, La Jolla, California 92037, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
CCL14
A, B, C, D
74Homo sapiensMutation(s): 0 
Gene Names: CCL14 (NCC2, SCYA14)
Find proteins for Q16627 (Homo sapiens)
Go to Gene View: CCL14
Go to UniProtKB:  Q16627
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.23 Å
  • R-Value Free: 0.234 
  • R-Value Work: 0.187 
  • Space Group: C 1 2 1
Unit Cell:
Length (Å)Angle (°)
a = 94.345α = 90.00
b = 78.073β = 121.65
c = 59.639γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
DENZOdata reduction
PDB_EXTRACTdata extraction
SCALEPACKdata scaling
PHASERphasing
HKL-2000data reduction
HKL-2000data collection

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2007-06-11 
  • Released Date: 2007-09-11 
  • Deposition Author(s): Blain, K.Y.

Revision History 

  • Version 1.0: 2007-09-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Version format compliance
  • Version 1.2: 2017-10-18
    Type: Refinement description