Abstract
The eggshell is a barrier that plays an important role in the defense of the egg against microbial and other infections; it protects the developing bird against unfavorable impacts of the environment and is essential for the reproduction of birds. The avian eggshell is a complex structure that is formed during movement along the oviduct by producing a multilayered mineral-organic composite. The extractable proteins of avian eggshells have been studied extensively and many of them identified, however, the insoluble (non-extractable) proteins have been sparsely studied. We studied the EDTA-insoluble proteinaceous film from the cuticle layer of eggshell. This film consists of three main areas: spots (cca 300 μm diameter), blotches (small spots with diameter only tens of μm), and the surroundings (i.e., the area without spots and blotches) where spots contain a visible accumulation of pigment. These areas were cut out of the membrane by laser microdissection, proteins were cleavaged by trypsin, and the peptides were analyzed by nLC/MS (Q-TOF). This study has identified 29 proteins and a further eight were determined by less specific “cleavage” with semitrypsin. The relative abundances of these proteins were determined using the exponentially modified protein abundance index (emPAI) where the most dominant proteins were eggshell-specific ones, such as ovocleidin-17 and ovocleidin-116. Individual areas of the cuticle membrane differ in their relative proportions of 14 proteins, where significant differences between the three quantification criteria (direct, after normalization to ovocledin-17, or to ovocledin-116) were observed in four proteins.
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Acknowledgments
Financial support from the Czech Science Foundation (no. 13-17224S), and long-term conceptual development of research organization RVO: 67985823 from the Academy of Sciences of the Czech Republic are gratefully acknowledged.
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Mikšík, I., Ergang, P. & Pácha, J. Proteomic analysis of chicken eggshell cuticle membrane layer. Anal Bioanal Chem 406, 7633–7640 (2014). https://doi.org/10.1007/s00216-014-8213-x
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DOI: https://doi.org/10.1007/s00216-014-8213-x