In:
Journal of Separation Science, Wiley, Vol. 31, No. 3 ( 2008-03), p. 523-537
Abstract:
The present study proposes a strategy for human in vivo acquired enamel pellicle (AEP) peptidome characterisation based on sequential extraction with guanidine and TFA followed by MALDI‐TOF/TOF identification. Three different nanoscale analytical approaches were used: samples were subjected to tryptic digestion followed by nano‐HPLC and mass spectrometry (MS and MS/MS) analysis. Undigested samples were analysed by LC‐MS (both linear and reflector modes) and LC‐MS/MS analysis, and samples were subjected to nano‐HPLC followed by on‐plate digestion and mass spectrometry (MS and MS/MS) analysis. The majority of the identifications corresponded to peptide/protein fragments of salivary protein, belonging to the classes: acidic PRPs, basic PRPs, statherin, cystatins S and SN and histatin 1 (all also identified in intact form). Overall, more than 90 peptides/proteins were identified. Results clearly show that peptides with acidic groups are enriched in the TFA fraction while peptides with no acidic or phosphate groups are prevalent on the guanidine extract. Also, phosphorylated peptides were observed mainly on the TFA fraction. Fragments present in the AEP show a predominance of cleavage points located at Arg, Tyr and Lys residues. Obtained data suggest that proteolytic activity could influence AEP formation and composition.
Type of Medium:
Online Resource
ISSN:
1615-9306
,
1615-9314
DOI:
10.1002/jssc.200700486
Language:
English
Publisher:
Wiley
Publication Date:
2008
detail.hit.zdb_id:
2047990-6
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