ERROR TOLERANT IDENTIFICATION OF PEPTIDES IN SEQUENCE DATABASES BY PEPTIDE SEQUENCE TAGS
ERROR TOLERANT IDENTIFICATION OF PEPTIDES IN SEQUENCE DATABASES BY PEPTIDE SEQUENCE TAGS
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DOI：
10.1021/ac00096a002
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发表时间：
1994-12-15
影响因子：
7.4
通讯作者：
WILM, M
中科院分区：
文献类型：
--
作者：
MANN, M;WILM, M
我们展示了一种鉴定质谱碎片肽的新方法。碎片谱通常包含一系列短的、易于识别的序列离子，从而产生部分序列。该部分序列将肽分为三个部分——区域 1、2 和 3，其特征在于区域 1 的附加质量 mi、区域 2 的部分序列和区域 3 的附加质量 ms。我们将构建体 m(1) 部分序列 m(3) 称为“肽序列标签”，并表明它是肽的高度特异性标识符。这里开发的算法使用序列标签在序列数据库中查找肽，最高可达 1比单独的部分序列信息具有百万倍的辨别力。即使存在未知的翻译后修饰或序列数据库中的条目与测量的肽之间的氨基酸取代，也可以鉴定肽。这些概念通过胰蛋白酶肽电喷雾质谱/质谱的模型和实际例子得到证明。仅通过片段化衍生的两到三个氨基酸残基就足以鉴定这些肽。在肽图应用中，需要的信息甚至更少。
We demonstrate a new approach to the identification of mass spectrometrically fragmented peptides. A fragmentation spectrum usually contains a short, easily identifiable series of sequence ions, which yields a partial sequence. This partial sequence divides the peptide into three parts-regions 1, 2, and 3-characterized by the added mass mi of region 1, the partial sequence of region 2, and the added mass ms of region 3. We call the construct, m(1) partial sequence m(3), a ''peptide sequence tag'' and show that it is a highly specific identifier of the peptide, An algorithm developed here that uses the sequence tag to find the peptide in a sequence database is up to 1 million-fold more discriminating than the partial sequence information alone. Peptides can be identified even in the presence of an unknown posttranslational modification or an amino acid-substitution between an entry in the sequence database and the measured peptide. These concepts are demonstrated with model and practical examples of electrospray mass spectrometry/mass spectrometry of tryptic peptides. Just two to three amino acid residues derived by fragmentation are enough to identify these peptides. In peptide mapping applications, even less information is necessary.