title: Comparison of electrophoretic protein profiles from sheep and goat parotid saliva.
abstract: Saliva provides a medium for short-term adaptation to changes in diet composition, namely, the presence of plant secondary metabolites. Salivary proteins have biological functions that have particular influence on oral homeostasis, taste, and digestive function. Some salivary proteins, such as proline-rich proteins, are present in browsers but absent in grazers. Despite the significance of salivary proteins, their expression patterns in many herbivores are unknown. We investigated the sodium dodecyl sulfate-polyacrylamide gel electrophoresis profile of parotid salivary proteins from two domesticated species, one a grazer, the sheep, Ovis aries, and the other a mixed feeder, the goat, Capra hircus, both fed on the same conventional diet. With 12.5% polyacrylamide linear gels, we observed uniform patterns of salivary proteins within the two species. In the goat profile, 21 major bands were observed, and 19 in the sheep profile. Each band was subjected to peptide mass fingerprinting for purposes of identification, allowing for 16 successful protein identifications. Marked differences were observed between the species in the region of 25-35 kDa molecular weights: one band was present in significantly different intensities; three bands were present only in goats; and one band was present only in sheep. This is the first report of a comparison of the protein salivary composition of sheep and goats and suggests that future research should be conducted to reveal a physiological function for salivary proteins related to the differences in feeding behavior of these species.
authors.affiliation: ICAM-Instituto de Ciências Agrárias Mediterrânicas, Universidade de Evora, Evora, Portugal.
authors.forename: Elsa
authors.initials: E
authors.lastname: Lamy
authors.forename: Gonçalo
authors.initials: G
authors.lastname: da Costa
authors.forename: Fernando
authors.initials: F
authors.lastname: Capela e Silva
authors.forename: José
authors.initials: J
authors.lastname: Potes
authors.forename: Ana Varela
authors.initials: AV
authors.lastname: Coelho
authors.forename: Elvira Sales
authors.initials: ES
authors.lastname: Baptista
mesh_terms: D000818:Animals; D004591:Electrophoresis, Polyacrylamide Gel; D006041:Goats; D010306:Parotid Gland / Q000378:metabolism; D012463:Saliva / Q000378:metabolism; D012471:Salivary Proteins and Peptides / Q000032:analysis* / Q000378:metabolism; D012756:Sheep
chemical_list: D012471:Salivary Proteins and Peptides