2pn5
From Proteopedia
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Crystal Structure of TEP1r
Overview
Thioester-containing proteins (TEPs) are a major component of the innate, immune response of insects to invasion by bacteria and protozoa. TEPs form, a distinct clade of a superfamily that includes the pan-protease, inhibitors alpha(2)-macroglobulins and vertebrate complement factors. The, essential feature of these proteins is a sequestered thioester bond that, after cleavage in a protease-sensitive region of the protein, is activated, and covalently binds to its target. Recently, TEP1 from the malarial, vector Anopheles gambiae was shown to mediate recognition and killing of, ookinetes from the malarial parasite Plasmodium berghei, a model for the, human malarial parasite Plasmodium falciparum. Here, we present the, crystal structure of the TEP1 isoform TEP1r. Although the overall protein, fold of TEP1r resembles that of complement factor C3, the TEP1r domains, are repositioned to stabilize the inactive conformation of the molecule, (containing an intact thioester) in the absence of the anaphylotoxin, domain, a central component of complement factors. The structure of TEP1r, provides a molecular basis for the differences between TEP1 alleles TEP1r, and TEP1s, which correlate with resistance of A. gambiae to infection by, P. berghei.
About this Structure
2PN5 is a Protein complex structure of sequences from Anopheles gambiae with and as ligands. Full crystallographic information is available from OCA.
Reference
Structural basis for conserved complement factor-like function in the antimalarial protein TEP1., Baxter RH, Chang CI, Chelliah Y, Blandin S, Levashina EA, Deisenhofer J, Proc Natl Acad Sci U S A. 2007 Jul 10;104(28):11615-20. Epub 2007 Jul 2. PMID:17606907
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