Constrained de novo sequencing of conotoxins.
Constrained de novo sequencing of conotoxins.
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DOI:
10.1021/pr300312h
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发表时间:
2012-08-03
影响因子:
4.4
通讯作者:
Bern M
中科院分区:
文献类型:
--
作者:
Bhatia S;Kil YJ;Ueberheide B;Chait BT;Tayo L;Cruz L;Lu B;Yates JR 3rd;Bern M
De novo peptide sequencing by mass spectrometry (MS) can determine the amino acid sequence of an unknown peptide without reference to a protein database. MS-based de novo sequencing assumes special importance in focused studies of families of biologically active peptides and proteins, such as hormones, toxins, and antibodies, for which amino acid sequences may be difficult to obtain through genomic methods. These protein families often exhibit sequence homology or characteristic amino acid content, yet current de novo sequencing approaches do not take advantage of this prior knowledge and hence search an unnecessarily large space of possible sequences. Here, we describe an algorithm for de novo sequencing that incorporates sequence constraints into the core graph algorithm, and thereby reduces the search space by many orders of magnitude. We demonstrate our algorithm in a study of cysteine-rich toxins from two cone snail species (Conus textile and Conus stercusmuscarum), and report 13 de novo and about 60 total toxins.
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