1dg3

Publication Abstract from PubMed

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.

Structure of human guanylate-binding protein 1 representing a unique class of GTP-binding proteins.,Prakash B, Praefcke GJ, Renault L, Wittinghofer A, Herrmann C Nature. 2000 Feb 3;403(6769):567-71. PMID:10676968^[1]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.