Macromolecule Content

• Total Structure Weight: 8869.38 
• Atom Count: 614 
• Residue Count: 77 
• Unique protein chains: 1

1G91

SOLUTION STRUCTURE OF MYELOID PROGENITOR INHIBITORY FACTOR-1 (MPIF-1)

• DOI: 10.2210/pdb1G91/pdb

• Classification: CYTOKINE
• Organism(s): Homo sapiens
• Expression System: Escherichia coli


• Deposited: 2000-11-21 Released: 2001-03-07 
• Deposition Author(s): Rajarathnam, K., Li, Y., Rohrer, T., Gentz, R.

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Experimental Data Snapshot

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 30 
• Selection Criteria: structures with the lowest energy 

Literature

Solution structure and dynamics of myeloid progenitor inhibitory factor-1 (MPIF-1), a novel monomeric CC chemokine.

Rajarathnam, K., Li, Y., Rohrer, T., Gentz, R.

(2001) J.Biol.Chem. 276: 4909-4916

• PubMed: 11060285 
• DOI: 10.1074/jbc.M005085200


• PubMed Abstract: 
  

MPIF-1, a CC chemokine, is a specific inhibitor of myeloid progenitor cells and is the most potent activator of monocytes. The solution structure of myeloid progenitor inhibitor factor-1 (MPIF-1) has been determined by NMR spectroscopy. The structure reveals that MPIF-1 is a monomer with a well defined core except for termini residues and adopts the chemokine fold of three beta-strands and an overlying alpha-helix. In addition to the four cysteines that characterize most chemokines, MPIF-1 has two additional cysteines that form a disulfide bond. The backbone dynamics indicate that the disulfide bonds and the adjacent residues that include the functionally important N-terminal and N-terminal loop residues show significant dynamics. MPIF-1 is a highly basic protein (pI >9), and the structure reveals distinct positively charged pockets that could be correlated to proteoglycan binding. MPIF-1 is processed from a longer proprotein at the N terminus and the latter is also functional though with reduced potency, and both proteins exist as monomers under a variety of solution conditions. MPIF-1 is therefore unique because longer proproteins of all other chemokines oligomerize in solution. The MPIF-1 structure should serve as a template for future functional studies that could lead to therapeutics for preventing chemotherapy-associated myelotoxicity.

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Organizational Affiliation: 

Department of Human Biological Chemistry and Genetics and Sealy Center for Structural Biology, University of Texas Medical Branch, Galveston, TX 77555, USA. [e-mail]

Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details
MYELOID PROGENITOR INHIBITORY FACTOR-1	A	77	Homo sapiens	Mutation(s): 0  Gene Names: CCL23 (MIP3, MPIF1, SCYA23)
Find proteins for P55773 (Homo sapiens) Go to Gene View: CCL23 Go to UniProtKB:  P55773

Experimental Data & Validation

Experimental Data

• Method: SOLUTION NMR
• Conformers Calculated: 50 
• Conformers Submitted: 30 
• Selection Criteria: structures with the lowest energy 
• Olderado: 1G91 Olderado

Structure Validation

Entry History 

Deposition Data

• Deposited Date: 2000-11-21 
• Released Date: 2001-03-07 
• Deposition Author(s): Rajarathnam, K., Li, Y., Rohrer, T., Gentz, R.

Revision History 

• Version 1.0: 2001-03-07
  Type: Initial release
• Version 1.1: 2008-04-27
  Type: Version format compliance
• Version 1.2: 2011-07-13
  Type: Version format compliance