Enhanced Characterization of Cardiolipins via Hybrid 193 nm Ultraviolet Photodissociation Mass Spectrometry.

Enhanced Characterization of Cardiolipins via Hybrid 193 nm Ultraviolet Photodissociation Mass Spectrometry.
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193 nm混合紫外光解离质谱仪增强心磷脂的特性。

DOI:
10.1021/acs.analchem.1c05071
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发表时间:
2022-02-22
影响因子:
7.4
通讯作者:
Brodbelt, Jennifer S.
Brodbelt, Jennifer S.
中科院分区:
化学1区
文献类型:
--
作者:
Macias, Luis A.;Brodbelt, Jennifer S.

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心磷脂(CLS)是一类结构复杂的甘油磷脂,具有独特的四酰化结构和独特的功能作用。这类脂质成分的异常与疾病状态有关,这激发了人们对开发新的方法来区分复杂混合物中不同CLS结构的兴趣。然而,使用传统方法表征这些复杂脂质的结构受到分辨率有限的限制,并且经常被证明无法辨别诸如不饱和位置或酰链位置分配等微妙但具有生物学意义的特征。在这里,我们描述了化学衍生化和混合解离技术的协同使用,以在鸟枪式质谱学策略中表征具有双键和锡位置异构体分辨率的复杂生物混合物中的化学发光。利用(三甲基硅基)重氮甲烷(TMSD)甲基化CL磷酸基团,通过产生金属阳离子脂类促进正模电离,通过混合高能碰撞激活/紫外光解离(HCD/UVPD)实现结构询问。TMSD衍生化和HCD/UVPD裂解的这种组合产生了诊断产物离子,允许区分和相对定量sn-立体异构体,并定位双键。将这一策略应用于甲状腺癌的总脂提取物,揭示了以前未报道的18:2/18:1基序,阐明了脂类特有的结构特征。
Cardiolipins (CLs) constitute a structurally complex class of glycerophospholipids with a unique tetraacylated structure accompanied by distinctive functional roles. Aberrations in the composition of this lipid class have been associated with disease states, spurring interest in the development of new approaches to differentiate the structures of diverse CLs in complex mixtures. The structural characterization of these complex lipids using conventional methods, however, suffers from limited resolution and frequently proves unable to discern subtle yet biologically significant features such as unsaturation sites or acyl chain position assignments. Here, we describe the synergistic use of chemical derivatization and hybrid dissociation techniques to characterize CL from complex biological mixtures with both double bond and sn positional isomer resolution in a shotgun mass spectrometry strategy. Utilizing (trimethylsilyl)diazomethane (TMSD), CL phosphate groups were methylated to promote positive-mode ionization by the production of metal-cationized lipids, enabling structural interrogation via hybrid higher-energy collisional activation/ultraviolet photodissociation (HCD/UVPD). This combination of TMSD derivatization and HCD/UVPD fragmentation results in diagnostic product ions that permit distinction and relative quantitation of sn-stereoisomers and the localization of double bonds. Applying this strategy to a total lipid extract from a thyroid carcinoma revealed a previously unreported 18:2/18:1 motif, elucidating a structural feature unique to the lipid class.
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