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Phosphorylation of Native Porcine Olfactory Binding Proteins

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Abstract

The identification of various isoforms of olfactory binding proteins is of major importance to elucidate their involvement in detection of pheromones and other odors. Here, we report the characterization of the phosphorylation of OBP (odorant binding protein) and Von Ebner’s gland protein (VEG) from the pig, Sus scrofa. After labeling with specific antibodies raised against the three types of phosphorylation (Ser, Thr, Tyr), the phosphate-modified residues were mapped by using the beta-elimination followed by Michael addition of dithiothreitol (BEMAD) method. Eleven phosphorylation sites were localized in the pOBP sequence and nine sites in the VEG sequence. OBPs are secreted by Bowman’s gland cells in the extracellular mucus lining the nasal cavity. After tracking the secretion pathway in the rough endoplasmic reticulum of these cells, we hypothesize that these proteins may be phosphorylated by ectokinases that remain to be characterized. The existence of such a regulatory mechanism theoretically increases the number of OBP variants, and it suggests a more specific role for OBPs in odorant coding than the one of odorant solubilizer and transporter.

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Acknowledgments

We warmly thank Dr Frédéric Lévy for his skillful dissection of pig RM, and Professor Paolo Pelosi for his kind gift of anti-VEG antibodies. We are also grateful to Michael Thant and Djamel Abderrahmani for their contribution to preliminary experiments. We thank two anonymous referees and Dr. S.J. Seybold for their help to improve the manuscript.

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Correspondence to Patricia Nagnan-Le Meillour.

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Chrystelle Le Danvic and Fanny Brimau contributed equally to the work.

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Supplementary data Fig. 1

Monoisotopic mass spectrum of MALDI-TOF MS analysis of carboxymethylated band slice containing pOBP and VEG (SDS-PAGE) of the pig, Sus scrofa, respiratory mucosa (RM) extract after CT treatment and BEMAD. A) Peptides eluting with 25% acetonitrile; B) Peptides eluting with 50% acetonitrile (GIF 6 kb)

Supplementary data Fig. 1

High resolution image file (TIF 6 kb)

Supplementary data Fig. 2

Monoisotopic mass spectrum of MALDI-TOF MS analysis of carboxymethylated band slice containing pOBP and VEG (SDS-PAGE) of the pig, Sus scrofa, respiratory mucosa (RM) extract after T + CT treatment and BEMAD. Peptides eluting with 25% acetonitrile (GIF 6 kb)

Supplementary data Fig. 2

High resolution image file (TIF 6 kb)

Supplementary data Fig. 3

Monoisotopic mass spectrum of MALDI-TOF MS analysis of carboxymethylated band containing pOBP and pVEG (SDS-PAGE) of the pig, Sus scrofa, respiratory mucosa (RM) after T treatment and BEMAD. A) Peptides eluting with 25% acetonitrile. The following peaks correspond to unmodified peptides generated by the digestion with trypsin: OBP- 138-157 (m/z = 2240.0447), VEG- 21–42 (m/z = 2351.1283), and 21–42 MSO:22 (m/z = 2367.1328). DTT-modified peptides are listed in Table 2. B) Peptides eluting with 50% acetonitrile. The following peaks correspond to unmodified peptides generated by the digestion with trypsin: OBP- 121–133 (m/z = 1537.6552), 1–15 PYRR:1 (m/z = 1711.7432), and 138–157 (m/z = 2239.9551). DTT-modified peptides are listed in Table 2 (GIF 6 kb)

Supplementary data Fig. 3

High resolution image file (TIF 6 kb)

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Nagnan-Le Meillour, P., Le Danvic, C., Brimau, F. et al. Phosphorylation of Native Porcine Olfactory Binding Proteins. J Chem Ecol 35, 752–760 (2009). https://doi.org/10.1007/s10886-009-9663-z

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  • DOI: https://doi.org/10.1007/s10886-009-9663-z

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