3OJA: Crystal Structure Of Lrim1APL1C COMPLEX

Citation:
Abstract
The leucine-rich repeat (LRR) proteins LRIM1 and APL1C control the function of the complement-like protein TEP1 in Anopheles mosquitoes. The molecular structure of LRIM1 and APL1C and the basis of their interaction with TEP1 represent a new type of innate immune complex. The LRIM1/APL1C complex specifically binds and solubilizes a cleaved form of TEP1 without an intact thioester bond. The LRIM1 and APL1C LRR domains have a large radius of curvature, glycosylated concave face, and a novel C-terminal capping motif. The LRIM1/APL1C complex is a heterodimer with a single intermolecular disulfide bond. The structure of the LRIM1/APL1C heterodimer reveals an interface between the two LRR domains and an extensive C-terminal coiled-coil domain. We propose that a cleaved form of TEP1 may act as a convertase for activation of other TEP1 molecules and that the LRIM1/APL1C heterodimer regulates formation of this TEP1 convertase.
PDB ID: 3OJADownload
MMDB ID: 85079
PDB Deposition Date: 2010/8/20
Updated in MMDB: 2010/10
Experimental Method:
x-ray diffraction
Resolution: 2.7  Å
Source Organism:
Similar Structures:
Biological Unit for 3OJA: dimeric; determined by author and by software (PISA)
Molecular Components in 3OJA
Label Count Molecule
Proteins (2 molecules)
1
Leucine-rich Immune Molecule 1
Molecule annotation
1
Anopheles Plasmodium-responsive Leucine-rich Repeat Protein 1
Molecule annotation
Chemicals (16 molecules)
1
12
2
4
* Click molecule labels to explore molecular sequence information.

Citing MMDB
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