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Current microbiology. 2025 May 6;82(6):278. doi: 10.1007/s00284-025-04261-7 Q32.62025

Coordinated Transcriptional Increases in Cell Wall Synthesis Genes in Neisseria gonorrhoeae Lacking the Lytic Transglycosylase, ltgA

缺少裂解转糖基酶ltgA的淋病奈瑟菌细胞壁合成基因组录 transcriptional 同步上调 翻译改进

Candra O Broadie  1, Alaa I Telchy  1, Antonio T Baines  1, Joseph P Dillard  2, Robert A Nicholas  3, Daniel Williams  4

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作者单位

  • 1 Department of Biological and Biomedical Sciences, North Carolina Central University, Durham, NC, 27707, USA.
  • 2 Department of Medical Microbiology and Immunology, University of Wisconsin-Madison, Madison, WI, 53706-1521, USA.
  • 3 Departments of Pharmacology and Microbiology and Immunology, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599-7365, USA.
  • 4 Department of Biological Sciences, Alabama State University, 915 S. Jackson Street, Montgomery, AL, 36104, USA. dawilliams@alasu.edu.
  • DOI: 10.1007/s00284-025-04261-7 PMID: 40327097

    摘要 中英对照阅读

    Lytic transglycosylase A in Neisseria gonorrhoeae cleaves the β-1,4-glycosidic bond between peptidoglycan (PG) monomers to liberate 1,6-anhydro-PG fragments that are either recycled or released as cytotoxic fragments. To gain further insight into the effect of LtgA on cellular processes in Neisseria gonorrhoeae, we performed a proteomic analysis comparing wild-type and an isogenic ltgA null mutant strain. Proteins were separated by two-dimensional gel ele... ...点击完成人机验证后继续浏览

    淋病奈瑟菌中的裂解转糖基酶A(Lytic transglycosylase A,简称LtgA)能够切割肽聚糖(Peptidoglycan,简称PG)单体之间的β-1,4-糖苷键,释放出可被再利用或作为细胞毒性片段释放的1,6-脱水肽聚糖片段。为了进一步了解LtgA对淋病奈瑟菌细胞过程的影响,我们通过比较野生型和等基因ltgA缺失突变体株系进行了蛋白质组学分析。蛋白质经过二维凝胶电泳分离,并利用基质辅助激光解析飞行时间质谱(MALDI-TOF 质谱)进行鉴定,揭示了几种在LtgA丢失后表达水平增加的蛋白质。最显著的变化对应于氨基糖和嘧啶代谢相关的酶。从ltgA缺失突变株中提取mRNA并采用实时定量RT-PCR技术进行测定的结果证实,在正常生长条件下以及经青霉素处理后,编码参与UDP-N-乙酰葡萄糖胺(UDP-GlcNAc)合成的酶基因的转录水平有所增加,而UDP-GlcNAc是PG和脂寡糖(LOS)合成的主要前体。我们还发现,与对应的野生型亲本株系相比,ltgA突变株对β-内酰胺类抗生素、万古霉素以及人源性抗菌肽LL-37的敏感性更高。我们的研究结果表明,UDP-GlcNAc产生的相关酶表达增加可能是由于LtgA失活和/或暴露于青霉素所导致的一种适应性反应。

    © 2025. The Author(s).

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    期刊名:Current microbiology

    缩写:CURR MICROBIOL

    ISSN:0343-8651

    e-ISSN:1432-0991

    IF/分区:2.6/Q3

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