Direct N-terminal sequencing of polypeptides using a thermostable bacterial aminopeptidase and MALDI-TOF mass spectrometry |
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Authors: | Nitin Kishor Purnananda Guptasarma |
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Affiliation: | Center for Protein Science, Design and Engineering (CPSDE), Department of Biological Sciences, Indian Institute of Science Education & Research (IISER) Mohali, Knowledge City, Sector-81, SAS Nagar, Punjab, 140306, India |
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Abstract: | Mass spectrometry-based amino acid sequencing is currently based almost entirely on collision-induced peptide fragmentation and analyses. Here, we describe a single-stage MS-based technique for amino acid sequencing involving partial, heterogenous digestion of a peptide by a processive, non-specific, heat-loving Bacillus subtilis-derived aminopeptidase (BsuAP), which acts optimally at 70 °C and allows ‘single-shot’ sequencing to be carried out through simultaneous accumulation, and detection of sub-populations of peptides of progressively reducing length. |
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Keywords: | Non-specific aminopeptidase Processive aminopeptidase Thermostable aminopeptidase Bacillus subtilis aminopeptidase Peptide N-terminal sequencing MALDI-TOF mass spectrometry |
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