3etw

Crystal Structure of bacterial adhesin FadA

spinqualitylabelsall models 3etw, resolution 2.00Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3etw is a 1 chain structure with sequence from Fusobacterium nucleatum. This structure supersedes the now removed PDB entry 2avr. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 2Å Ligands: SCN Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Function Q5I6B0_FUSNU Publication Abstract from PubMed Many bacterial appendages have filamentous structures, often composed of repeating monomers assembled in a head-to-tail manner. The mechanisms of such linkages vary. We report here a novel protein oligomerization motif identified in the FadA adhesin from the Gram-negative bacterium Fusobacterium nucleatum. The 2.0 A crystal structure of the secreted form of FadA (mFadA) reveals two antiparallel -helices connected by an intervening eight-residue hairpin loop. Leucine-leucine contacts play a prominent dual intra- and inter-molecular role in the structure and function of FadA. First, they comprise the main association between the two helical arms of the monomer; second, they mediate the head-to-tail association of monomers to form the elongated polymers. This leucine-mediated filamentous assembly of FadA molecules constitutes a novel structural motif termed the "leucine chain". The essential role of these residues in FadA is corroborated by mutagenesis of selected leucine residues, which leads to the abrogation of oligomerization, filament formation, and binding to host cells. Crystal structure of FadA adhesin from fusobacterium nucleatum reveals a novel oligomerization motif: The leucine chain.,Nithianantham S, Xu M, Yamada M, Ikegami A, Shoham M, Han YW J Biol Chem. 2008 Nov 7. PMID:18996848 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Adhesin 3D structures

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