白喉棒狀桿菌Corynebacterium diphtheriae ATCC菌種
中國(guó)微生物菌種查詢(xún)網(wǎng)白喉棒狀桿菌Corynebacterium diphtheriae,菌體大小為(0.3~0.8μm)×(1~5μm),細(xì)長(zhǎng)稍彎,粗細(xì)不一,菌體一端或兩端排列呈棒狀,排列不規(guī)則,常呈L、V、X、T等字形或排成柵欄狀。革蘭氏染色陽(yáng)性,無(wú)莢膜、鞭毛,不產(chǎn)生芽胞;用美蘭液染色菌體著色不均勻,常呈著色深的顆粒;用奈瑟氏染色菌體染成黃褐色,一端或二端染成藍(lán)色或深藍(lán)色顆粒,稱(chēng)為異染顆粒(Metachromatic granules),其主要成分是磷酸鹽和核糖核酸,是本菌形態(tài)特征之一 。
Corynebacterium diphtheriae (Kruse) Lehmann and Neumann 拉丁名
(ATCC? 27011?) 統(tǒng)一編號(hào)
Strain Designations 別名 C7 s (gamma) tox (-)
Isolation 分離源 Lysogenic: carries temperate phage gamma tox -, lytic on Corynebacterium diphtheriae ATCC 27010.
Biosafety Level 生物安全等級(jí) 2
Biosafety classification is based on U.S. Public Health Service Guidelines, it is the responsibility of the customer to ensure that their facilities comply with biosafety regulations for their own country.
Product Format 提供形式 freeze-dried
Preceptrol? no
Type Strain 模式菌株 no
Medium 培養(yǎng)基 ATCC? Medium 611: PGT medium
Growth Conditions 生長(zhǎng)條件
Temperature 培養(yǎng)溫度 : 37.0°C
Name of Depositor 寄存者 WL Barksdale
References 參考文獻(xiàn) Holmes RK, Barksdale L. Genetic analysis of tox+ and tox- bacteriophages of Corynebacterium diphtheriae. J. Virol. 3: 586-598, 1969. PubMed: 4978942
Barksdale L. Corynebacterium diphtheriae and its relatives. Bacteriol. Rev. 34: 378-422, 1970. PubMed: 4322195
本菌的致病物質(zhì)主要是白喉毒素。白喉毒素是含有兩個(gè)二硫鍵的多肽鏈,分子量為62,000。經(jīng)蛋白酶水解后,可分為A和B兩個(gè)片段,中間仍由二硫鍵聯(lián)接。B片段,無(wú)酶活性,但能與宿主易感細(xì)胞表面特異性受體結(jié)合,并通過(guò)易位作用使A片段進(jìn)入細(xì)胞。A片段具有酶活性,能將氧化型煙酰胺腺嘌呤二核苷(NAD+)水解為煙酰胺及腺嘌呤二磷酸核糖(ADPR)兩部分,并催化延伸因子-2(Elongation factor-2,EF-2)與ADPR共價(jià)結(jié)合,使EF-2失去轉(zhuǎn)位活性,從而中止肽-tRNA及mRNA在核糖體上由受位轉(zhuǎn)移至供位,肽鏈不能延長(zhǎng),細(xì)胞蛋白質(zhì)合成受阻,細(xì)胞死亡,病變產(chǎn)生。