5O9M image
Deposition Date 2017-06-19
Release Date 2017-12-20
Last Version Date 2024-10-09
Entry Detail
PDB ID:
5O9M
Keywords:
Title:
Crystal structure of human Histamine-Releasing Factor (HRF/TCTP)containing a disulphide-linked dimer
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.40 Å
R-Value Free:
0.19
R-Value Work:
0.17
R-Value Observed:
0.18
Space Group:
P 21 21 21
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:Translationally-controlled tumor protein
Gene (Uniprot):TPT1
Chain IDs:A, B
Chain Length:180
Number of Molecules:2
Biological Source:Homo sapiens
Ligand Molecules
Primary Citation
Crystal structures of murine and human Histamine-Releasing Factor (HRF/TCTP) and a model for HRF dimerisation in mast cell activation.
Mol. Immunol. 93 216 222 (2017)
PMID: 29216544 DOI: 10.1016/j.molimm.2017.11.022

Abstact

In allergic disease, mast cell activation is conventionally triggered by allergen-mediated cross-linking of receptor-bound IgE on the cell surface. In addition to its diverse range of intracellular roles in apoptosis, cell proliferation and cancer, Histamine-Releasing Factor (HRF) also activates mast cells and basophils. A subset of IgE antibodies bind HRF through their Fab regions, and two IgE binding sites on HRF have been mapped. HRF can form dimers, and a disulphide-linked dimer is critical for activity. The current model for the activity of HRF in mast cell activation involves cross-linking of receptor-bound IgE by dimeric HRF, mediated by HRF/Fab interactions. HRF crystal and solution structures have provided little insight into either the formation of disulphide-linked HRF dimers or the ability of HRF to activate mast cells. We report the first crystal structure of murine HRF (mHRF) to 4.0Å resolution, revealing a conserved fold. We also solved the structure of human HRF (hHRF) in two new crystal forms, one at the highest resolution (1.4Å) yet reported. The high resolution hHRF structure reveals a disulphide-linked dimer, in which the two molecules are closely associated, and provides a model for the role of both human and murine HRF in mast cell activation.

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Primary Citation of related structures