Distinguishing Aspartic and Isoaspartic Acids in Peptides by Several Mass Spectrometric Fragmentation Methods.

Distinguishing Aspartic and Isoaspartic Acids in Peptides by Several Mass Spectrometric Fragmentation Methods.
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DOI:
10.1007/s13361-016-1487-9
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发表时间:
2016-12
影响因子:
3.2
通讯作者:
Reilly JP
Reilly JP
中科院分区:
化学3区
文献类型:
--
作者:
DeGraan-Weber N;Zhang J;Reilly JP

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比较了6种区分天冬氨酸及其异构体异天冬氨酸的离子碎裂技术。将MALDI源后衰变(PSD)、MALDI 157 nm光解离、PSD和光解离中的TMPP电荷标记、ESI碰撞诱导解离(CID)、电子转移解离(ETD)和具有CID的自由基引发肽测序(FRIPS)应用于含有天冬氨酸或异天冬氨酸的肽。诊断离子,如y-46和B+H2O,存在于PSD、光解离和电荷标记中。在ETD和FRIPS实验中观察到c·+57和z-57离子。对于某些分子,天冬氨酸和异天冬氨酸产生具有显著不同强度的离子碎片。ETD和电荷标记似乎是最有效的区分这些残基。
Six ion fragmentation techniques that can distinguish aspartic acid from its isomer, isoaspartic acid, were compared. MALDI post source decay (PSD), MALDI 157 nm photodissociation, TMPP charge tagging in PSD and photodissociation, ESI collision-induced dissociation (CID), electron transfer dissociation (ETD), and free-radical initiated peptide sequencing (FRIPS) with CID were applied to peptides containing either aspartic or isoaspartic acid. Diagnostic ions, such as the y-46 and b+H2O, are present in PSD, photodissociation, and charge tagging. c•+57 and z-57 ions are observed in ETD and FRIPS experiments. For some molecules, aspartic and isoaspartic acid yield ion fragments with significantly different intensities. ETD and charge tagging appear to be most effective at distinguishing these residues.
DOI: 10.1021/bi951526c
发表时间: 1996-02-13
期刊: BIOCHEMISTRY
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