Dermcidin的表達(dá)、純化、功能結(jié)構(gòu)和表皮葡萄球菌抗Dermcidin的機(jī)理
本文選題:抗菌肽 + Dermcidin; 參考:《華東師范大學(xué)》2006年博士論文
【摘要】:近年來,由于抗生素的長期和高劑量使用,許多菌株對其產(chǎn)生耐藥性,甚至出現(xiàn)了能夠耐受幾乎所有抗生素的“超細(xì)菌”。因此,尋找一種能夠替代抗生素的藥物迫在眉睫?咕氖撬拗飨忍旆烙到y(tǒng)的重要組成成分,而來自人皮膚的抗菌肽在抗感染的第一道防線中起主要作用。由于抗菌肽的使用不易產(chǎn)生耐藥和交叉抗性,且具有抗細(xì)菌、真菌、病毒、原生動物、后生動物寄生物及腫瘤等活性,因此其將有望成為替代普通抗生素的一類新型藥物。 人汗腺抗菌肽Dermcidin是Schittek等科學(xué)家2001年從人體汗液中分離得到的新型小分子抗菌肽,它不僅能殺死革蘭氏陰性、陽性細(xì)菌和部分真菌,而且還可能對某些癌癥如乳腺癌有治療作剛。它作為一種藥物,對人體不存在抗原性,是代替抗生素的首選藥物。但是,由于Dermcidin被發(fā)現(xiàn)的時間短,到目前為止,對它的研究僅限于其在染色體上的基因定位,從人汗液分離或化學(xué)合成該肽來研究其抗菌活性和一些檢測方法的摸索。而對Dermcidin的理化性質(zhì)、二級結(jié)構(gòu)及其在抗菌過程中的結(jié)構(gòu)-功能關(guān)系和作用機(jī)制的研究仍是一片空白。這些都限制了Dermcidin成為新型抗生素,在感染性疾病和炎癥上廣泛應(yīng)用的可能。因此,大量獲得Dermcidin,系統(tǒng)研究其結(jié)構(gòu)-功能關(guān)系和作用機(jī)理是解決上述問題的關(guān)鍵。 為了能快速并低成本地獲得Dermcidin,,首先我們將Dermcidin基因克隆到畢赤酵母載體pPIC9中,并在畢赤酵母GS115中進(jìn)行表達(dá)。實驗結(jié)果顯示畢赤酵母GS115系統(tǒng)所表達(dá)的Dermcidin在pH5.5~7.4范圍內(nèi)具有抗大腸桿菌和金黃色葡萄球菌的活性。這個結(jié)果說明在畢赤酵母中表達(dá)的DCD-1L能夠抗部分革
[Abstract]:In recent years, because of the long-term and high-dose use of antibiotics, many strains have become resistant to antibiotics, and even "superbacteria" which can tolerate almost all antibiotics have emerged. Therefore, it is urgent to find a drug that can replace antibiotics. Antimicrobial peptides are important components of host innate defense system, and antimicrobial peptides from human skin play a major role in the first line of defense against infection. Because the use of antimicrobial peptides is not easy to produce drug resistance and cross resistance, and has anti-bacterial, fungal, virus, protozoan, metazoan parasite and tumor activities, so it is expected to be a new type of drugs to replace ordinary antibiotics. Human sweat gland antimicrobial peptide (Dermcidin) is a new small molecular antimicrobial peptide isolated from human sweat by Schittek and other scientists in 2001. It can not only kill Gram-negative, positive bacteria and some fungi, but also may cure some cancers such as breast cancer. As a kind of medicine, it has no antigenicity to human body and is the first choice to replace antibiotics. However, due to the short time that Dermcidin was discovered, so far, the study of Dermcidin is limited to its gene location on chromosome, isolation or chemical synthesis of the peptide from human sweat to study its antibacterial activity and exploration of some detection methods. However, the study of physicochemical properties, secondary structure, structure-function relationship and action mechanism of Dermcidin is still a blank. All these limit the possibility of Dermcidin becoming a new antibiotic and widely used in infectious diseases and inflammation. Therefore, the key to solve the above problems is to obtain Dermcidin in large quantities and systematically study its structure-function relationship and mechanism. In order to obtain Dermcidin quickly and cheaply, we first cloned the Dermcidin gene into Pichia pastoris vector pPIC9 and expressed it in Pichia pastoris GS115. The results showed that the Dermcidin expressed by Pichia pastoris GS115 system had the activity of resisting Escherichia coli and Staphylococcus aureus in the range of pH5.5~7.4. The results indicate that DCD-1L expressed in Pichia pastoris can resist partial leather.
【學(xué)位授予單位】:華東師范大學(xué)
【學(xué)位級別】:博士
【學(xué)位授予年份】:2006
【分類號】:R341
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