Understanding the molecular mechanisms and biological functions of a novel bleach-sensing bacterial receptor in shaping host-associated bacterial populations in response to host inflammation

了解新型漂白剂感应细菌受体在塑造宿主相关细菌群体以响应宿主炎症方面的分子机制和生物学功能

• 批准号: 10217956
• 负责人: Arden Baylink
• 金额: $ 11.74万
• 依托单位: UNIVERSITY OF OREGON
• 依托单位国家: 美国
• 财政年份: 2020
• 资助国家: 美国
• 起止时间: 2020-07-16 至 2022-06-30
• 项目状态: 已结题
• 来源: https://reporter.nih.gov/project-details/10217956
• 关键词: Animal Model; Animals; Antioxidants; Bacteria; Bacterial Infections; Binding; Biochemical Pathway; Biological; Biological Assay; Biological Process; Biological Testing; Biology; Chemistry; Chemoreceptors; Chemotaxis; Chronic; Colon Carcinoma; Communicable Diseases; Crystallography; Cysteine; Disease; Engineering; Enzyme-Linked Immunosorbent Assay; Enzymes; Escherichia coli; Feedback; Fingers; Gastric Tissue; Gastric ulcer; Genetic Engineering; Goals; Helicobacter pylori; Human; Hypochlorous Acid; Immune; Immune system; In Situ; In Vitro; Infection; Infectious Diseases Research; Inflammation; Inflammation Process; Inflammatory Bowel Diseases; Invaded; Investigation; Knowledge; Learning; Leukocytes; Ligands; Measures; Metals; Microbial Biofilms; Microscopy; Modeling; Molecular; Molecular Conformation; Molecular Structure; Mus; Nutrient; Oregon; Oxidants; Oxidation-Reduction; Oxides; Pathogenicity; Pattern; Peroxidases; Physiological; Play; Point Mutation; Population; Process; Production; Proteins; Reaction; Research; Research Personnel; Role; Salmonella; Salmonella typhimurium; Second Messenger Systems; Shapes; Signal Transduction; Signaling Protein; Site; Source; Spatial Distribution; Stomach; Structure; Sulfhydryl Compounds; Swimming; System; Tertiary Protein Structure; Testing; Therapeutic Uses; Tissues; Training; Ulcerative Colitis; Universities; Virulent; Work; Zebrafish; Zinc; antimicrobial; bacterial community; blind; career development; cell motility; chronic infection; commensal bacteria; diguanylate cyclase; drug discovery; experience; experimental study; gut colonization; imaging genetics; in vivo; insight; malignant stomach neoplasm; microbial; mouse model; neutrophil; novel; oxidation; pathogen; pathogenic bacteria; persistent bacteria; prevent; receptor; response; sensor; zinc-binding protein

PROJECT SUMMARY/ABSTRACT A large body of research has elucidated the role of bleach (HOCl) as a potent antimicrobial produced by the immune system through neutrophil myeloperoxidase, but new findings have provided intriguing instances in which this paradigm is challenged, and some important human bacterial pathogens such as Salmonella Typhimurium and Helicobacter pylori have been shown to actually be attracted to inflamed tissue—where HOCl can reach millimolar concentrations—and can exploit host inflammation processes to colonize and establish persistent infections. The molecular basis for how these bacteria can use motility and chemotaxis to respond to HOCl and reaction products is mostly unknown, and represents an important new direction for infectious disease research with the potential to provide many insights into how pathogenic and commensal bacteria colonize and persist in animal hosts to cause disease. The broad and long-term objective of this project is to learn how host-associated bacteria navigate the inflammation and redox landscape of the gut, which has implications for many human infectious diseases, especially those involving bacterial-promoted chronic inflammation such as stomach cancer, ulcerative colitis, and inflammatory bowel diseases. The key focus of this project is to advance understanding of how host-associated bacteria sense and respond to inflammation by investigating a novel bleach-sensing regulatory module referred to as chemoreceptor zinc-binding (CZB) domains that are conserved broadly in commensal and pathogenic bacteria. Specific Aim 1 will use a reductionist in vitro approach to test if CZB domains function through a conserved mechanism by analyzing residue conformation patterns and determining the reactivity with HOCl of representative CZB proteins from H. pylori, S. Typhimurium, and E. coli. Specific Aim 2 will perform the first tests of the biological roles of CZB domains in bacterial infections with a novel ELISA chemotaxis assay and infections in zebrafish and mouse model organisms. Important for the Career Development of Dr. Arden Perkins, this project will provide him comprehensive new training in using animal models, which he has never done, as well as expertise in microscopy and live imaging, and genetic engineering of bacteria. This training will build on Dr. Perkins’ prior experience in protein crystallography, drug discovery, and redox biology to make him a competent investigator at the interface of in vitro and in vivo work, and enable him to pursue investigations into the functions of key proteins involved in bacterial infections at the molecular and biological levels. Dr. Perkins will be trained at University of Oregon in the zebrafish system, a high throughput model in which he will study bacterial dynamics and responses to neutrophils in situ, and collaborators Dr. Manuel Amieva at Stanford and Dr. Andreas Baumler at UC Davis will provide expert guidance and support for extending these studies to mouse models of infection of H. pylori and S. Typhimurium, respectively.

项目总结/文摘

项目成果

Rural exclusion from science and academia.

• DOI: 10.1016/j.tim.2021.06.012
• 发表时间: 2021-11
• 期刊: Trends in microbiology
• 影响因子: 15.9
• 作者: O'Neal L;Perkins A
• 通讯作者: Perkins A

A Bacterial Inflammation Sensor Regulates c-di-GMP Signaling, Adhesion, and Biofilm Formation.

• DOI: 10.1128/mbio.00173-21
• 发表时间: 2021-06-29
• 期刊: mBio
• 影响因子: 6.4
• 作者: Perkins A;Tudorica DA;Teixeira RD;Schirmer T;Zumwalt L;Ogba OM;Cassidy CK;Stansfeld PJ;Guillemin K
• 通讯作者: Guillemin K