牙龈卟啉单胞菌合成环二腺苷酸的高效液相色谱-串联质谱法定性分析

Qualitative analysis of bis-(3'-5')-cyclic dimeric adenosine monophosphate of Porphyromonas gingivalis by high performance liquid chromatography coupled with mass spectrometry

目的定性检测牙龈卟啉单胞菌(P.gingivalis)是否能产生细菌信号分子环二腺苷酸(c-di-AMP),为探索其在P.gingivalis生命代谢以及牙周炎免疫中的作用奠定基础。方法以P.gingivalis标准菌株ATCC33277为实验菌株,抽提细菌内核酸物质作为样品,配置c-di-AMP标准品,通过高效液相色谱-串联质谱法(HPLC-MS/MS)和高效液相色谱法(HPLC)对样品进行验证。结果 HPLC-MS/MS检出限按照信噪比(S/N)3∶1计算,c-di-AMP标准品出峰的保留时间为7.49 min,P.gingivalis提取物样品在保留时间为8.82 min时有目标峰出现(大于3 S/N)。HPLC检测结果表明,P.gingivalis核酸提取物样品及c-di-AMP标准品均在15.7 min处出现目标峰,且二者的紫外吸收光谱相同。结论牙龈卟啉单胞菌核酸提取物中含有c-di-AMP,牙龈卟啉单胞菌可以合成产生c-di-AMP。

Objective To test whether Porphyromonas gingivalis（P. gingivalis） could produce bacterial signal molecule, bis-（3＇-5＇）-cyclic dimeric adenosine monophosphate（c-di-AMP） and lay the foundation for explorations of its roles in life metabolism and periodontitis immunity of P. gingivalis. Methods P. gingivalis standard strain ATCC33277 was used as the experimental strain to extract nucleic acids from the bacteria. Then, c-di-AMP was detected using high performance liquid chromatography coupled with mass spectrometry（HPLC-MS/MS）. Subsequently, HPLC was used to validate the sample further. Results Based on the signal/noise（S/N） for 3∶1, the limit of determination of HPLC-MS/MS for peak time of c-di-AMP standard substances was 7.49 min and nucleic acid extractions from P. gingivalis was 8.82 min（S/N〉3）. Further confirmation of HPLC showed that nucleic acid extractions from both P. gingivalis and c-di-AMP standard substances presented goal absorbent peaks at 15.7 min, with the same ultraviolet absorbent spectrum. Conclusion The nucleic acid extractions from P. gingivalis contained c-di-AMP, which shows that P. gingivalis could produce c-di-AMP.