3rzs

Apis mellifera OBP14 in complex with Ta6Br14

spinqualitylabelsall models 3rzs, resolution 1.88Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image   Print3D Structural highlights 3rzs is a 1 chain structure with sequence from Apis mellifera. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance. Method: X-ray diffraction, Resolution 1.88Å Resources: FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT Publication Abstract from PubMed Apis mellifera (Amel) relies on its olfactory system to detect and identify new-sources of floral food. The Odorant-Binding Proteins (OBPs) are the first proteins involved in odorant recognition and interaction, before activation of the olfactory receptors. The Amel genome possess a set of 21 OBPs, much fewer compared to the 60-70 OBPs found in Diptera genomes. We have undertaken a structural proteomics study of Amel OBPs, alone or in complex with odorant or model compounds. We report here the first 3D structure of a member of the C-minus class OBPs, AmelOBP14, characterized by only two disulfide bridges of the three typical of classical OBPs. We show that AmelOBP14 possesses a core of 6 alpha-helices comparable to that of classical OBPs, and an extra exposed C-terminal helix. Its binding site is located within this core and is completely closed. Fluorescent experiments using 1-NPN displacement demonstrate that AmelOBP14 is able to bind several compounds with sub micromolar dissociation constants, among which citralva and eugenol exhibit the highest affinities. We have determined the structures of AmelOBP14 in complex with 1-NPN, eugenol and citralva, explaining their strong binding. Finally, by introducing a double cysteine mutant at positions 44 and 97, we show that a third disulfide bridge was formed in the same position as in classical OBPs without disturbing the fold of AmelOBP14. Crystal structure of Apis mellifera OBP14, a C-minus odorant-binding protein, and its complexes with odorant molecules.,Spinelli S, Lagarde A, Iovinella I, Legrand P, Tegoni M, Pelosi P, Cambillau C Insect Biochem Mol Biol. 2011 Oct 31. PMID:22075131 From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. See Also Odorant binding protein 3D structures

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