3T5S

Structure of macrophage migration inhibitory factor from Giardia lamblia

PDB DOI: 10.2210/pdb3T5S/pdb

Classification: IMMUNE SYSTEM
Organism(s): Giardia lamblia ATCC 50803
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2011-07-28 Released: 2011-08-24
Deposition Author(s): Seattle Structural Genomics Center for Infectious Disease (SSGCID)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 2.30 Å
R-Value Free: 0.268
R-Value Work: 0.221
R-Value Observed: 0.223

wwPDB Validation 3D Report Full Report

This is version 1.1 of the entry. See complete history.

Literature

Crystal structure of a macrophage migration inhibitory factor from Giardia lamblia.

Buchko, G.W., Abendroth, J., Robinson, H., Zhang, Y., Hewitt, S.N., Edwards, T.E., Van Voorhis, W.C., Myler, P.J.

(2013) J Struct Funct Genomics 14: 47-57

PubMed: 23709284 Search on PubMedSearch on PubMed Central
DOI: 10.1007/s10969-013-9155-9
Primary Citation of Related Structures:
3T5S

PubMed Abstract:

Macrophage migration inhibitory factor (MIF) is a eukaryotic cytokine that affects a broad spectrum of immune responses and its activation/inactivation is associated with numerous diseases. During protozoan infections MIF is not only expressed by the host, but, has also been observed to be expressed by some parasites and released into the host. To better understand the biological role of parasitic MIF proteins, the crystal structure of the MIF protein from Giardia lamblia (Gl-MIF), the etiological agent responsible for giardiasis, has been determined at 2.30 Å resolution. The 114-residue protein adopts an α/β fold consisting of a four-stranded β-sheet with two anti-parallel α-helices packed against a face of the β-sheet. An additional short β-strand aligns anti-parallel to β4 of the β-sheet in the adjacent protein unit to help stabilize a trimer, the biologically relevant unit observed in all solved MIF crystal structures to date, and form a discontinuous β-barrel. The structure of Gl-MIF is compared to the MIF structures from humans (Hs-MIF) and three Plasmodium species (falciparum, berghei, and yoelii). The structure of all five MIF proteins are generally similar with the exception of a channel that runs through the center of each trimer complex. Relative to Hs-MIF, there are differences in solvent accessibility and electrostatic potential distribution in the channel of Gl-MIF and the Plasmodium-MIFs due primarily to two "gate-keeper" residues in the parasitic MIFs. For the Plasmodium MIFs the gate-keeper residues are at positions 44 (Y --> R) and 100 (V --> D) and for Gl-MIF it is at position 100 (V --> R). If these gate-keeper residues have a biological function and contribute to the progression of parasitemia they may also form the basis for structure-based drug design targeting parasitic MIF proteins.

Organizational Affiliation:

Biological Sciences Division, Pacific Northwest National Laboratory, Richland, WA 99352, USA. garry.buchko@pnnl.gov

Macromolecules

Find similar proteins by:

(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Macrophage migration inhibitory factor	A	135	Giardia lamblia ATCC 50803	Mutation(s): 0 Gene Names: GL50803_12091, GL50803_0012091
UniProt
Find proteins for A8BFP4 (Giardia intestinalis (strain ATCC 50803 / WB clone C6)) Explore A8BFP4 Go to UniProtKB: A8BFP4
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	A8BFP4
Protein Feature View Expand
Reference Sequence

Small Molecules

Ligands 2 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
SO4 Query on SO4 Download Ideal Coordinates CCD File SDF format, chain B [auth A] MOL2 format, chain B [auth A]	B [auth A]	SULFATE ION O₄ S QAOWNCQODCNURD-UHFFFAOYSA-L		Ligand Interaction
CL Query on CL Download Ideal Coordinates CCD File SDF format, chain C [auth A] MOL2 format, chain C [auth A]	C [auth A]	CHLORIDE ION Cl VEXZGXHMUGYJMC-UHFFFAOYSA-M		Ligand Interaction