幽門螺桿菌在NO壓力下的巰基亞硝基化修飾及蛋白質組反應特征
[Abstract]:Helicobacter pylori (H. pylori) is a gram-negative, screw-like microaerobic bacterium that colonizes human gastric epithelial cells and can cause chronic gastritis, peptic ulcer, gastric mucosa-associated lymphoid tissue (MALT) lymphoma and gastric cancer. It was listed by the International Agency for Research on Cancer (IARC) of the World Health Organization in 1994. Class I carcinogenic factors. Helicobacter pylori can activate the human immune system after colonization of gastric mucosa, including local and systemic antibody reactions, cell-mediated immune responses, etc. Clinical data and animal experiments show that these congenital and secondary immune reactions have certain clearance of Helicobacter pylori, if fully geographically Understanding their immuno-killing effect on Helicobacter pylori may provide important clues for the development of new anti-Helicobacter pylori agents.
Nitric oxide (NO) molecule is an important effector molecule with antimicrobial and immunoregulatory activities. Its L-arginine synthesis pathway depends on the catalysis of nitric oxide synthase (NOS). There are two types of NOS in the body: structural nitric oxide synthase (cNOS) and inducible nitric oxide synthase (iNOS). INOS can be expressed in many kinds of cells under some physiological conditions. When iNOS is expressed, it can continuously produce a large number of NO, which plays an important role in the immune process of the body, especially in anti-infective immunity. Therefore, NO is one of the hottest research topics in the field of biology and medicine. In the field of microbiology, the study of NO is also very active. Jump.
It is well known that cysteine (HS-) plays an important role in many protein functions. The formation of covalent bonds between NO and thiols is called mercaptonitrosation modification. This modification is closely related to a variety of physiological and pathological processes, such as smooth muscle relaxation, neurotransmitter delivery and immune defense. Biotin conversion method is used to analyze the characteristics of mercapto-nitroso proteins, and the mercapto-nitroso proteins are further studied by antibody or mass spectrometry. Nitroso modification of active mercapto is an important mechanism of NO damage to pathogens. Therefore, the analysis method for mercapto-nitroso is very suitable. Objective to study the target of immune molecule NO on microorganisms.
Genomics and proteomics are high-throughput biotechnology systems as a whole, and their rise has promoted the rapid development of various branches of life sciences. Genes are carriers of genetic information, and proteins are the executors of all biological functions. Due to the influence of post-transcriptional regulation and translation, changes in the level of mRNA can not be achieved. Proteomics is a high-throughput system for studying specific proteins that function in different time and space at an overall level. It has been proved to be a powerful tool for studying the adaptive responses of bacteria to various environmental stresses. Two strains of Helicobacter pylori (H. pylori 26) Genome-wide sequences of 695 and H. pylori J99 have been sequenced. In order to make full use of these bioinformatics resources, biotin conversion and high-throughput comparative proteomics methods were used to analyze the sulfhydryl nitroso modification of Helicobacter pylori protein by NO and the protein expression of Helicobacter pylori under NO pressure. The main research contents and experimental results are as follows:1.
Nitric oxide on thiol nitrosation of Helicobacter pylori and its bacteriostatic effect
When Helicobacter pylori infects humans, it can activate the innate and secondary immune responses of the host. NO is an important non-specific immune effector molecule. Up to now, no studies have been done to analyze the antibacterial activity of reactive nitrogen substances (RNS) such as NO against Helicobacter pylori. One of the main mechanisms of RNS against pathogenic microorganisms is that However, the target protein of RNS to Helicobacter pylori is still unclear. In this experiment, the strong bacteriostatic and bactericidal activity of NO to Helicobacter pylori was detected in vitro for the first time, and the effect of GSNO on Helicobacter pylori was analyzed. After incubation of Helicobacter pylori bacterial proteins with GSNO, the proteins labeled with biotin conversion method (BSM) were purified and separated by gel electrophoresis. Finally, the proteins were identified by MALDI-TOF-TOF mass spectrometry. Sulfhydryl nitrosogenic proteins are chaperone molecule and heat shock protein (GroEL), urease alpha subunit (UreA), alkyl hydroperoxide reductase (TsaA), HP0721 and HP0129, which preliminarily reveal the possible bacteriostatic mechanism of RNS to Helicobacter pylori. Defense function, adhesion and colonization ability.
Two, the proteome reaction characteristics of Helicobacter pylori under no pressure.
Helicobacter pylori has a variety of strategies to escape innate immune responses. Active nitrogen compounds, such as NO, synthesized via NOS pathway, are important effectors in innate immune responses. However, the mechanism of how Helicobacter pylori survives under NO pressure has not been fully elucidated. Proteomic analysis of Helicobacter pylori has been carried out in this study. Characteristics of bacterial protein reactions under nitrosation pressures. 38 proteins regulated by nitric oxide donors (sodium nitroprusside) were screened by comparative proteomics. These proteins are involved in protein processing, antioxidation, general stress response, virulence factors, and some unknown functions, respectively. Some of the selected proteins are involved in iron metabolism, and the results of the literature suggest that they may be under the control of iron-carrying regulator (Fur). Although Fur proteins may not be captured in comparative proteomics due to low protein abundance, the results of real-time quantitative PCR show that nitroso In addition, thioredoxin reductase (TrxR) was analyzed in 38 stress proteins. To confirm the role of Fur or TrxR in the tolerance of H. pylori to NO stress, we constructed mutants with deletion of Fur and TrxR genes, which were detected in pylorus after deletion of fur or trxR genes. Helicobacter spp. is more sensitive to nitrosation pressure, suggesting that Fur regulator and TrxR play an important role in NO pressure regulation.
【學位授予單位】:山東大學
【學位級別】:博士
【學位授予年份】:2009
【分類號】:R378
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