1DG3 image
Deposition Date 1999-11-23
Release Date 2000-10-11
Last Version Date 2024-05-22
Entry Detail
PDB ID:
1DG3
Title:
STRUCTURE OF HUMAN GUANYLATE BINDING PROTEIN-1 IN NUCLEOTIDE FREE FORM
Biological Source:
Source Organism:
Homo sapiens (Taxon ID: 9606)
Host Organism:
Method Details:
Experimental Method:
Resolution:
1.80 Å
R-Value Free:
0.27
R-Value Work:
0.24
R-Value Observed:
0.24
Space Group:
C 1 2 1
Macromolecular Entities
Polymer Type:polypeptide(L)
Molecule:PROTEIN (INTERFERON-INDUCED GUANYLATE-BINDING PROTEIN 1)
Gene (Uniprot):GBP1
Chain IDs:A
Chain Length:592
Number of Molecules:1
Biological Source:Homo sapiens
Primary Citation
Structure of human guanylate-binding protein 1 representing a unique class of GTP-binding proteins.
Nature 403 567 571 (2000)
PMID: 10676968 DOI: 10.1038/35000617

Abstact

Interferon-gamma is an immunomodulatory substance that induces the expression of many genes to orchestrate a cellular response and establish the antiviral state of the cell. Among the most abundant antiviral proteins induced by interferon-gamma are guanylate-binding proteins such as GBP1 and GBP2. These are large GTP-binding proteins of relative molecular mass 67,000 with a high-turnover GTPase activity and an antiviral effect. Here we have determined the crystal structure of full-length human GBP1 to 1.8 A resolution. The amino-terminal 278 residues constitute a modified G domain with a number of insertions compared to the canonical Ras structure, and the carboxy-terminal part is an extended helical domain with unique features. From the structure and biochemical experiments reported here, GBP1 appears to belong to the group of large GTP-binding proteins that includes Mx and dynamin, the common property of which is the ability to undergo oligomerization with a high concentration-dependent GTPase activity.

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