MALDI imaging and in situ identification of integral membrane proteins from rat brain tissue sections.

MALDI imaging and in situ identification of integral membrane proteins from rat brain tissue sections.
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DOI:
10.1021/ac400902h
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发表时间:
2013-08-06
影响因子:
7.4
通讯作者:
Caprioli, Richard M.
Caprioli, Richard M.
中科院分区:
化学1区
文献类型:
--
作者:
Nicklay, Joshua J.;Harris, Glenn A.;Schey, Kevin L.;Caprioli, Richard M.

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Transmembrane proteins are greatly underrepresented in data generated by imaging mass spectrometry (IMS) because of analytical challenges related to their size and solubility. Here we present the first example of MALDI IMS of two highly modified multi-transmembrane domain proteins, myelin proteolipid protein (PLP, 30 kDa) and DM-20 (26 kDa), from various regions of rat brain, namely the cerebrum, cerebellum, and medulla. We utilize a novel tissue pre-treatment aimed at transmembrane protein enrichment to show the in situ distribution of fatty acylation of these proteins, particularly of post-translational palmitoylation. Additionally, we demonstrate the utility of protease-encapsulated hydrogels for spatially localized on-tissue protein digestion and peptide extraction for subsequent direct coupling to LC-MS/MS for protein identification.
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