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Three amino acid residues bind corn odorants to McinOBP1 in the polyembryonic endoparasitoid of Macrocentrus cingulum Brischke.
- Source :
-
PloS one [PLoS One] 2014 Apr 04; Vol. 9 (4), pp. e93501. Date of Electronic Publication: 2014 Apr 04 (Print Publication: 2014). - Publication Year :
- 2014
-
Abstract
- Odorant binding proteins (OBPs) play a central role in transporting odorant molecules from the sensillum lymph to olfactory receptors to initiate behavioral responses. In this study, the OBP of Macrocentrus cingulum McinOBP1 was expressed in Escherichia coli and purified by Ni ion affinity chromatography. Real-time PCR experiments indicate that the McinOBP1 is expressed mainly in adult antennae, with expression levels differing by sex. Ligand-binding experiments using N-phenyl-naphthylamine (1-NPN) as a fluorescent probe demonstrated that the McinOBP1 can bind green-leaf volatiles, including aldehydes and terpenoids, but also can bind aliphatic alcohols with good affinity, in the order trans-2-nonenal>cis-3-hexen-1-ol>trans-caryophelle, suggesting a role of McinOBP1 in general odorant chemoreception. We chose those three odorants for further homology modeling and ligand docking based on their binding affinity. The Val58, Leu62 and Glu130 are the key amino acids in the binding pockets that bind with these three odorants. The three mutants, Val58, Leu62 and Glu130, where the valine, leucine and glutamic residues were replaced by alanine, proline and alanine, respectively; showed reduced affinity to these odorants. This information suggests, Val58, Leu62 and Glu130 are involved in the binding of these compounds, possibly through the specific recognition of ligands that forms hydrogen bonds with the ligands functional groups.
- Subjects :
- Amino Acid Sequence
Animals
Arthropod Antennae metabolism
Female
Hymenoptera genetics
Hymenoptera metabolism
Male
Molecular Sequence Data
Phylogeny
Plant Proteins genetics
Protein Binding
Receptors, Odorant genetics
Sequence Analysis, DNA
Sequence Homology, Amino Acid
Hymenoptera parasitology
Plant Proteins metabolism
Protein Interaction Domains and Motifs genetics
Receptors, Odorant chemistry
Receptors, Odorant metabolism
Zea mays genetics
Zea mays metabolism
Subjects
Details
- Language :
- English
- ISSN :
- 1932-6203
- Volume :
- 9
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- PloS one
- Publication Type :
- Academic Journal
- Accession number :
- 24705388
- Full Text :
- https://doi.org/10.1371/journal.pone.0093501