Comparative phosphoproteomic analysis of neonatal and adult murine brain.

Comparative phosphoproteomic analysis of neonatal and adult murine brain.
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DOI:
10.1002/pmic.201200003
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发表时间:
2012-07
期刊:
影响因子:
3.4
通讯作者:
Ballif, Bryan A.
Ballif, Bryan A.
中科院分区:
生物学3区
文献类型:
--
作者:
Goswami, Tapasree;Li, Xue;Smith, Aidan M.;Luderowski, Eva M.;Vincent, James J.;Rush, John;Ballif, Bryan A.

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Developmental processes are governed by diverse regulatory mechanisms including a suite of signaling pathways employing reversible phosphorylation. With the advent of large-scale phosphoproteomics it is now possible to identify thousands of phosphorylation sites from tissues at distinct developmental stages. We describe here the identification of over 6,000 non-redundant phosphorylation sites from neonatal murine brain. When compared to nearly three times the number of phosphorylation sites identified from three-week-old murine brain, remarkably one-third of the neonatal sites were unique. This fraction only dropped to one-quarter when allowing the site to stray plus or minus 15 residues. This provides evidence for considerable change in the profiles of developmentally-regulated phosphoproteomes. Using quantitative mass spectrometry we characterized a novel phosphorylation site (Ser265) identified uniquely in the neonatal brain on Doublecortin (Dcx), a protein essential for proper mammalian brain development. While the relative levels of Dcx and phospho-Ser265 Dcx between embryonic and neonatal brain were similar, their levels fell precipitously by postnatal day 21, as did phospho-Ser297, a site required for proper neuronal migration. Both sites lie near the microtubule-binding domain and may provide functionally similar regulation via different kinases.
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