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辐射对耐辐射球菌(Deinococcus radiodurans)抗氧化酶活性提高的影响 被引量:7
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作者 田兵 高冠军 +1 位作者 徐步进 华跃进 《核农学报》 CAS CSCD 北大核心 2004年第3期221-224,共4页
利用低剂量 ( 5 0~ 1 5 0 0Gy)的60 Coγ射线辐照处于稳定早期的耐辐射球菌培养物 ,考察了辐照剂量和辐照后培养时间对菌体中抗氧化酶 ,即超氧化物歧化酶 (SOD)和过氧化氢酶 (CAT)含量的影响。结果表明 ,在一定辐照条件 ( 2 0 0~ 1 0 ... 利用低剂量 ( 5 0~ 1 5 0 0Gy)的60 Coγ射线辐照处于稳定早期的耐辐射球菌培养物 ,考察了辐照剂量和辐照后培养时间对菌体中抗氧化酶 ,即超氧化物歧化酶 (SOD)和过氧化氢酶 (CAT)含量的影响。结果表明 ,在一定辐照条件 ( 2 0 0~ 1 0 0 0Gy)下 ,经过 30~ 60min的辐照后培养 ,菌体中SOD和CAT酶活性显著提高 ,其中 1 0 0 0Gy辐照且辐照后培养 30min的SOD酶活性达到1 49 69U mg ,CAT酶活性达 1 85 5 0 1U mg。分别比对照 (未辐照 )提高了 75 5 9%和 60 98%。低水平辐照 ( 0~ 1 0 0 0Gy)对菌体生物量的影响不明显。 展开更多
关键词 辐射 耐辐射球菌 deinococcus radiodurans 抗氧化酶活性
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奇球菌(Deinococcus radiodurans)吸附U(Ⅵ)的试验研究 被引量:5
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作者 陈婷 谢水波 +3 位作者 李仕友 刘迎九 唐东山 王劲松 《安全与环境学报》 CAS CSCD 北大核心 2009年第1期23-26,共4页
为了探讨奇球菌对铀的吸附特性,研究了pH值、吸附时间、菌体浓度、铀起始浓度和预处理奇球菌对铀吸附的影响,并考察了菌体上铀的解吸作用。结果表明,在pH值为4.0时,吸附量最大;30min吸附基本达到平衡;吸附量与菌体浓度负相关,与铀起始... 为了探讨奇球菌对铀的吸附特性,研究了pH值、吸附时间、菌体浓度、铀起始浓度和预处理奇球菌对铀吸附的影响,并考察了菌体上铀的解吸作用。结果表明,在pH值为4.0时,吸附量最大;30min吸附基本达到平衡;吸附量与菌体浓度负相关,与铀起始浓度正相关,吸附量最大可达126.27 mg/g。经乙醇预处理的菌体,其吸附量有所上升。解吸试验表明,0.5 mol/L Na_2CO_3对铀的解吸率可达93.15%。与Langmuir吸附模型相比,奇球菌对U(Ⅵ)的吸附更符合Freundlich吸附等温式。 展开更多
关键词 市政工程 生物吸附 奇球菌(deinococcus radiodurans)
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极端耐辐射奇异球菌Deinococcus sp.BR501切除修复系统突变株的构建及功能的鉴定 被引量:1
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作者 刘秀敏 吴菁 +4 位作者 张维 陆伟 平淑珍 林敏 陈明 《核农学报》 CAS CSCD 北大核心 2007年第4期357-361,共5页
极端辐射异常球菌Deinococcussp.BR501的核苷酸切除修复系统,可能包含两条途径:依赖于UV损伤内切酶β(UvsE)的修复途径和依赖于UV损伤内切酶α(UvrABC)的修复途径,其关键酶分别为UvsE(dr1819编码)和UvrABC(A亚基dr1771编码)。根据Deinoc... 极端辐射异常球菌Deinococcussp.BR501的核苷酸切除修复系统,可能包含两条途径:依赖于UV损伤内切酶β(UvsE)的修复途径和依赖于UV损伤内切酶α(UvrABC)的修复途径,其关键酶分别为UvsE(dr1819编码)和UvrABC(A亚基dr1771编码)。根据Deinococcus radiodurans的序列,采用同源克隆的方法,设计PCR引物、克隆基因和体外阻断目的基因,再通过PCR产物线性转化的方法,筛选到同源双交换的重组阻断突变株△dr1771、△dr1819和△dr1771与△dr1819的双突变株。对此突变株和野生型均进行UV辐射抗性和化学损伤试剂MMC与H2O2的损伤修复能力的分析。结果表明了BR501中两条核苷酸切除修复途径的存在,并且只有两条途径同时缺失时,才能使菌体对UV和DNA交联剂MMC敏感。 展开更多
关键词 耐辐射微生物 deinococcus radiodurans 切除修复
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Deinococcus属细菌分类和应用的研究进展 被引量:1
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作者 陈立 邢瑞云 董俊兴 《微生物学杂志》 CAS CSCD 2008年第5期73-76,共4页
Deinococcus属菌株是一类对引起细胞致死效应的辐射有极强抵抗能力的细菌。目前已有23个有效发表种,对Deinococcus属的应用研究也受到了广泛关注。对其分类和应用研究进行了综述。
关键词 deinococcus 分类 应用
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羽毛降解菌Deinococcus actinosclerus RM的分离、鉴定及其产生的蛋白酶酶学性质 被引量:2
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作者 柯野 谢天涵 +3 位作者 梅颖诗 张敏 黄湘 屈奇奇 《福建农林大学学报(自然科学版)》 CSCD 北大核心 2022年第1期98-103,共6页
从羽毛废弃物的排水沟污泥中采集污泥样品,通过富集培养、分离、纯化、发酵筛选,获得一株降解羽毛效果最佳的RM菌株.对该菌株进行形态特征、16S rDNA序列以及生理生化试验初步鉴定RM菌株为Deinococcus actinosclerus.该菌株在4%羽毛含... 从羽毛废弃物的排水沟污泥中采集污泥样品,通过富集培养、分离、纯化、发酵筛选,获得一株降解羽毛效果最佳的RM菌株.对该菌株进行形态特征、16S rDNA序列以及生理生化试验初步鉴定RM菌株为Deinococcus actinosclerus.该菌株在4%羽毛含量条件下,培养7 d后对羽毛的降解率高达60%,且羽毛水解产物含有多种氨基酸,如丝氨酸、天冬氨酸.RM菌株产生的胞外蛋白酶以丝氨酸蛋白酶为主,也含有天冬氨酸蛋白酶、半胱氨酸蛋白酶.粗酶液最适反应温度为45℃,最适pH为10.0;金属离子Cu^(2+)、Mg^(2+)能够提高蛋白酶活性,而Ca^(2+)、Ni^(2+)、Zn^(2+)及蛋白酶抑制剂苯甲基磺酰氟、乙二胺四乙酸、亮抑蛋白酶肽对酶活性有抑制作用.通过以上结果可知,RM菌株对羽毛的高效降解具有较高的潜在应用价值. 展开更多
关键词 羽毛降解 deinococcus actinosclerus RM菌株 分离鉴定 酶学性质
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抗辐射菌Deinococcus radiodurans的多样性
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作者 屠振力 方俐晶 王家刚 《生态学报》 CAS CSCD 北大核心 2012年第4期1318-1326,共9页
抗辐射菌Deinococcus radiodurans是一种对电离辐射和其他DNA损伤因子具有极强抵抗能力的细菌,是研究DNA损伤与修复的模式生物。综述了国内外在抗辐射菌研究上取得的最新研究成果,从生存环境、对DNA损伤因子的抗性、抗性机理及其损伤修... 抗辐射菌Deinococcus radiodurans是一种对电离辐射和其他DNA损伤因子具有极强抵抗能力的细菌,是研究DNA损伤与修复的模式生物。综述了国内外在抗辐射菌研究上取得的最新研究成果,从生存环境、对DNA损伤因子的抗性、抗性机理及其损伤修复关联基因等方面报道了抗辐射菌的多样性,并探讨了该细菌高效正确的DNA损伤修复机理的相关研究成果在生命科学、农业、环境修复及医学等领域的应用前景。 展开更多
关键词 抗辐射菌 辐射抗性 deinococcus radiodurans DNA损伤修复 多样性
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Functional analysis of helicase and three tandem HRDC domains of RecQ in Deinococcus radiodurans 被引量:1
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作者 HUANG Li-fen HUA Xiao-ting +4 位作者 LU Hui-ming GAO Guan-jun TIAN Bing SHEN Bing-hui HUA Yue-jin 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2006年第5期373-376,共4页
RecQ is a highly conserved helicase necessary for maintaining genome stability in all organisms. Genome comparison showed that a homologue of RecQ in Deinococcus radiodurans designated as DR1289 is a member of RecQ fa... RecQ is a highly conserved helicase necessary for maintaining genome stability in all organisms. Genome comparison showed that a homologue of RecQ in Deinococcus radiodurans designated as DR1289 is a member of RecQ family with unusual domain arrangement: a helicase domain, an RecQ C-terminal domain, and surprisingly three HRDC domain repeats, whose func-tion, however, remains obscure currently. Using an insertion deletion, we discovered that the DRRecQ mutation causes an increase in gamma radiation, hydroxyurea and mitomycine C and UV sensitivity. Using the shuttle plasmid pRADK, we complemented various domains of the D. radiodurans RecQ (DRRecQ) to the mutant in vivo. Results suggested that both the helicase and helicase-and-RNase-D-C-terminal (HRDC) domains are essential for complementing several phenotypes. The complementation and biochemical function of DRRecQ variants with different domains truncated in vitro suggested that both the helicase and three HRDC domains are necessary for RecQ functions in D. radiodurans, while three HRDC domains have a synergistic effect on the whole function. Our finding leads to the hypothesis that the RecF recombination pathway is likely a primary path of double strand break repair in this well-known radioresistant organism. 展开更多
关键词 RECQ deinococcus radiodurans HELICASE HRDC
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Dose Effects of Ion Beam Exposure on Deinococcus Radiodurans: Survival and Dose Response 被引量:1
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作者 宋道军 吴丽芳 +1 位作者 吴李君 余增亮 《Plasma Science and Technology》 SCIE EI CAS CSCD 2001年第1期665-672,共8页
To explore the survival and dose response of organism for different radiation sources is of great importance in the research of radiobiology. In this study, the survival-dose response of Deinococcus radiodurans (E.col... To explore the survival and dose response of organism for different radiation sources is of great importance in the research of radiobiology. In this study, the survival-dose response of Deinococcus radiodurans (E.coli, as the control) for ultra-violet (UV), γ-rays radiation and ion beam exposure was investigated. The shoulder type of survival curves were found for both UV and γ-ray ionizing radiation, but the saddle type of survival curves were shown for H+、 N+( 20keV and 30keV) and Ar+ beam exposure. This dose effect of the survival initially decreased with the increase in dose and then increased in the high dose range and finally decreased again in the higher dose range. Our experimental results suggest that D. radiodurans, which is considerably radio-resistant to UV and x-ray and γ-ray ionizing radiation, do not resist ion beam exposure. 展开更多
关键词 In COLI Dose Effects of Ion Beam Exposure on deinococcus Radiodurans Survival and Dose Response
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Effect of N+ Beam Exposure on Superoxide Dismutase and Catalase Activities and Induction of Mn-SOD in Deinococcus Radiodurans
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作者 宋道军 陈若雷 +2 位作者 邵春林 吴李君 余增亮 《Plasma Science and Technology》 SCIE EI CAS CSCD 2000年第5期491-497,共7页
Though bacteria of the radiation-resistant Deinococcus radiodurans have a high resistance to the lethal and mutagenic effects of many DNA-damaging agents, the mechanisms involved in the response of these bacteria to o... Though bacteria of the radiation-resistant Deinococcus radiodurans have a high resistance to the lethal and mutagenic effects of many DNA-damaging agents, the mechanisms involved in the response of these bacteria to oxidative stress are poorly understood. In this report, the superoxide dismutase (SOD) and catalase (CAT) activities produced by these bacteria were measured, and the change of SOD and CAT activities by 20 keV N+ beam exposure was examined. Their activities were increased by N+ beam exposure from 8x 1014 ions/cm2 to 6x1015 ions/cm2.The treatment of H2O2 and [ CHC13 +CH3 CH2OH ] and the measurement of absorption spectrum showed that the increase in SOD activity was resulted from inducible activities of MnSOD in D. radiodurans AS1.633 by N+ beam exposure . These results suggested that this bacteria possess inducible defense mechanisms against the deleterious effects of oxidization. 展开更多
关键词 SOD Effect of N CHC Beam Exposure on Superoxide Dismutase and Catalase Activities and Induction of Mn-SOD in deinococcus Radiodurans Mn
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Chromium (Ⅲ) Biosorption of Deinococcus radiodurans and Its Vitreoscilla Haemoglobin (vgb) Gene-Transferred Recombinants
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作者 Elif Ozbey Dilek Asma 《Journal of Pharmacy and Pharmacology》 CAS 2021年第4期140-148,共9页
Objectives:This study used Deinococcus radiodurans,which is extremely resistant to oxidative damage,genotoxic chemicals,high levels of ionising and ultraviolet radiation and drying,and its Vitreoscilla haemoglobin(vgb... Objectives:This study used Deinococcus radiodurans,which is extremely resistant to oxidative damage,genotoxic chemicals,high levels of ionising and ultraviolet radiation and drying,and its Vitreoscilla haemoglobin(vgb)gene-cloned recombinant with the vgb−recombinant strain as a control.In addition to the conditions wherein bacteria have an optimum Cr(Ⅲ)biosorption capacity,the contribution of the vgb gene to the biosorption ability of the bacteria has been investigated by providing the organism with a more oxygenic environment.Methods:Bacteria were produced and metal stock solution was prepared.To determine the Cr(Ⅲ)removal capacities of wild and recombinant D.radiodurans strains,the residual metal concentration in aqueous media at the beginning and after biosorption was determined in Atomic Absorption Spectrophotometer.Some optimal conditions were created for the biosorption conditions to occur.Conclusions:The optimisation tests showed that Cr(Ⅲ)reached the highest biosorption capacity within 15 minutes at a metal concentration of 2,000 ppm,30°C,pH 5.0 and 150 rpm stirring speed in all the three bacteria.The vgb gene had no significant contribution to the biosorption capacity. 展开更多
关键词 deinococcus radiodurans Chromium(Ⅲ)Biosorption Vitreoscilla Haemoglobine
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The radioresistant and survival mechanisms of Deinococcus radiodurans
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作者 Feng Liu Nuomin Li Yongqian Zhang 《Radiation Medicine and Protection》 CSCD 2023年第2期70-79,共10页
Deinococcus radiodurans (D. radiodurans) is distinguished by the most radioresistant organism ever known, and can tolerate extreme environments such as ionizing radiation, ultraviolet radiation, oxidation, and desicca... Deinococcus radiodurans (D. radiodurans) is distinguished by the most radioresistant organism ever known, and can tolerate extreme environments such as ionizing radiation, ultraviolet radiation, oxidation, and desiccation. D. radiodurans is an important model for studying DNA damage/repair and redox regulation upon high dose ionizing radiation. How D. radiodurans response and repair ROS-induced oxidative damage remains a subject of ongoing investigation. This review provides an overview of the radioresistance characteristics of D. radiodurans. Among them, the DNA damage repair pathway and high-efficiency antioxidant defense system are summarized in detail. Furthermore, a novel model that protects the cell against the ionizing radiation is proposed. This review also discusses the potential application , future challenges and directions in advancing towards D. radiodurans studies. 展开更多
关键词 deinococcus radiodurans Radioresistant mechanism Oxidative stress DNA repair Antioxidant defense system
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杀藻菌株Deinococcus sp.Y35的培养基优化及其杀藻菌剂的制备 被引量:1
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作者 李祎 姜晓冰 +4 位作者 刘磊 朱红 王海磊 郑伟 郑天凌 《应用与环境生物学报》 CAS CSCD 北大核心 2016年第5期897-903,共7页
塔玛亚历山大藻是一种有毒甲藻,常引发赤潮,严重威胁海洋生态的稳定和人类的健康,细菌Deinococcus sp.Y35表现出对塔玛亚历山大藻的杀藻能力,为促进菌株生长、提高杀藻效果并方便保存,对菌株Y35培养条件进行优化,并制备杀藻菌剂.分别确... 塔玛亚历山大藻是一种有毒甲藻,常引发赤潮,严重威胁海洋生态的稳定和人类的健康,细菌Deinococcus sp.Y35表现出对塔玛亚历山大藻的杀藻能力,为促进菌株生长、提高杀藻效果并方便保存,对菌株Y35培养条件进行优化,并制备杀藻菌剂.分别确定菌株Y35生长所需的最适氮源、碳源、无机盐,并确定其最适添加量,在优化的基础上完成冻干菌剂的制备和最适冻干保护剂的选择.菌株Y35生长的最适培养基成分是1.0%胰蛋白胨和0.5%酵母粉.在优化的培养基基础上对菌株Y35进行发酵,培养至对数期后进行冷冻干燥,制备杀藻菌剂.菌株Y35需要添加1.0 g/L的蔗糖作为冻干保护剂.杀藻菌剂的杀藻添加量为2.0 mg/m L.本研究可为下一步将细菌应用于赤潮治理奠定基础. 展开更多
关键词 deinococcus sp.Y35 塔玛亚历山大藻 培养基优化 杀藻菌剂
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Construction of DNA damage response gene pprI function-deficient and function-complementary mutants in Deinococcus radiodurans 被引量:12
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作者 GAOGuanjun LUHuiming HUANGLifen HUAYuejin 《Chinese Science Bulletin》 SCIE EI CAS 2005年第4期311-316,共6页
PprI, a DNA damage response factor from the extraordinary radioresistant bacterium Deinococcus radi- odurans, plays a central regulatory role in multiple DNA damage repair. In this study, a fusion DNA fragment carry- ... PprI, a DNA damage response factor from the extraordinary radioresistant bacterium Deinococcus radi- odurans, plays a central regulatory role in multiple DNA damage repair. In this study, a fusion DNA fragment carry- ing kanamycin resistance gene with the D. radiodurans groEL promoter was cloned by PCR amplification and reversely inserted into the pprI locus in the genome of the wild-type strain R1. The resulting pprI-deficient strain, designated YR1, was very sensitive to ionizing radiation. Meanwhile, the re- combinant DNA fragment was cloned into the shuttle vector pRADZ3, and resulted in plasmid pRADK with kanamycin resistance in D. radiodurans. The fragments containing com- plete pprI gene and 3′-terminal deletion pprI△ were cloned into plasmid pRADK. The resulted plasmids designated pRADKpprI and pRADKpprI△ were then transformed to YR1. Results show that YR1 carrying pRADKpprI was able to fully restore the extreme radioresistance to the same level as the wild-type D. raiodurans R1, whereas YR1 pRADKpprI△ failed to do so. Construction of DNA repair switch PprI function-deficient and function-complementary mutants in D. radiodurans is not only useful to elucidating the relationship between domains and functions of PprI pro- tein, but also opens the door to the further studies of the bio- logical functions of PprI protein in vivo. 展开更多
关键词 PPRI 基因 DNA 细菌 deinococcus radiodurans 突变异种 生物体 致电离辐射 生物特征
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Ring-like nucleoid does not play a key role in radioresistance of Deinococcus radiodurans 被引量:1
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作者 GAO GuanJun, LU HuiMing, YIN LongFei & HUA YueJin Institute of Nuclear-Agricultural Sciences, Zhejiang University, Hangzhou 310029, China 《Science China(Life Sciences)》 SCIE CAS 2007年第4期525-529,共5页
The conclusion based on transmission electron microscopy, "the tightly packed ring-like nucleoid of the Deinococcus radiodurans R1 is a key to radioresistance", has instigated lots of debates. In this study,... The conclusion based on transmission electron microscopy, "the tightly packed ring-like nucleoid of the Deinococcus radiodurans R1 is a key to radioresistance", has instigated lots of debates. In this study, according to the previous research of PprI’s crucial role in radioresistance of D. radiodurans, we have attempted to examine and compare the nucleoid morphology differences among wild-type D. ra-diodurans R1 strain, pprI function-deficient mutant (YR1), and pprI function-complementary strains (YR1001, YR1002, and YR1004) before and after exposure to ionizing irradiation. Fluorescence mi-croscopy images indicate: (1) the majority of nucleoid structures in radioresistant strain R1 cells ex-hibit the tightly packed ring-like morphology, while the pprI function-deficient mutant YR1 cells carrying predominate ring-like structure represent high sensitivity to irradiation; (2) as an extreme radioresistant strain similar to wild-type R1, pprI completely function-complementary strain YR1001 almost displays the loose and irregular nucleoid morphologies. On the other hand, another radioresistant pprI partly function-complementary strain YR1002’s nucleiods exhibit about 60% ring-like structure; (3) a PprI C-terminal deletion strain YR1004 consisting of approximately 60% of ring-like nucleoid is very sensi-tive to radiation. Therefore, our present experiments do not support the conclusion that the ring-like nucleoid of D. radiodurans does play a key role in radioresistance. 展开更多
关键词 deinococcus radiodurans R1 RING-LIKE NUCLEOID PPRI ionizing irradiation RADIORESISTANCE
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Global effect of an RNA polymerase β-subunit mutation on gene expression in the radiation-resistant bacterium Deinococcus radiodurans
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作者 HUA XiaoTing WANG Hu +2 位作者 WANG Chao TIAN Bing HUA YueJin 《Science China(Life Sciences)》 SCIE CAS 2011年第9期854-862,共9页
The β-subunit of RNA polymerase, which is involved in rifampin binding, is highly conserved among prokaryotes, and Rile mutants detected in many bacteria are the result of amino acid changes. Spontaneous rifampin res... The β-subunit of RNA polymerase, which is involved in rifampin binding, is highly conserved among prokaryotes, and Rile mutants detected in many bacteria are the result of amino acid changes. Spontaneous rifampin resistance mutations resulting in amino acid replacement (L420R) and deletion (1258-66 9 bp deletion) have been previously isolated in the rpoB gene of Deinococcus radiodurans. In this study, a β-subunit mutation in D. radiodurans resulted in a unique effect on growth rate. We used DNA microarrays and biochemical assays to investigate how the Rif mutation in the β-subunit led to changes in growth rate via altered regulation of multiple genes. The expression of genes with predicted functions in metabolism, cellular processes and signaling, and information storage and processing were significantly altered in the 9 bp-deletion rpoB mutant. The consensus promoter sequence of up-regulated genes in the 9 bp-deletion rpoB mutant was identified as an AT-rich sequence. Greater levels of reactive oxygen species accumulated in the L420R and 9 bp-deletion rpoB mutants compared with wild type. These results provide insight into the molecular mechanism of how the β-subunit Rif mutation alters the regulation of multiple genes. 展开更多
关键词 RPOB RIFAMPIN deinococcus transcriptome microarray
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耐辐射异球菌pprM基因克隆及功能预测 被引量:3
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作者 王玮 宋素琴 +4 位作者 张志东 唐琦勇 陈明 张维 石玉瑚 《新疆农业科学》 CAS CSCD 北大核心 2012年第8期1449-1455,共7页
【目的】通过耐辐射异球菌(Deinococcus radiodurans)pprM基因可能功能的研究,为进一步开发利用耐辐射微生物宝贵基因资源奠定基础。【方法】通过PCR方法克隆pprM基因,利用穿梭表达载体pRADZ3将其转入大肠杆菌内,通过冲击试验分析其功... 【目的】通过耐辐射异球菌(Deinococcus radiodurans)pprM基因可能功能的研究,为进一步开发利用耐辐射微生物宝贵基因资源奠定基础。【方法】通过PCR方法克隆pprM基因,利用穿梭表达载体pRADZ3将其转入大肠杆菌内,通过冲击试验分析其功能。【结果】pprM基因转入大肠杆菌,发现该基因能提高大肠杆菌的抗盐、耐旱能力。【结论】pprM基因是一个非常重要的抗逆基因,在农业育种方面有极好的应用前景。 展开更多
关键词 deinococcus radiodurans pprM基因克隆 功能预测
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一株极端耐辐射奇异球菌的分离和初步鉴定 被引量:3
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作者 陈明 刘秀敏 +1 位作者 张维 林敏 《核农学报》 CAS CSCD 北大核心 2007年第1期44-47,共4页
从放射性污染的土壤样品中分离出1株具有极端耐辐射的微生物BR501,该菌最适生长温度为30℃,不具有氨苄青霉素、氯霉素、四环素、卡那霉素和利福平等抗性。UV、γ辐射生长曲线的结果显示BR501菌株具有极强的辐射抗性。BR501菌株的16S rDN... 从放射性污染的土壤样品中分离出1株具有极端耐辐射的微生物BR501,该菌最适生长温度为30℃,不具有氨苄青霉素、氯霉素、四环素、卡那霉素和利福平等抗性。UV、γ辐射生长曲线的结果显示BR501菌株具有极强的辐射抗性。BR501菌株的16S rDNA序列与多株Deinococcus属菌株有很高的同源性,其中,与D.radiodurans菌株的16S rDNA相似性高达99%。结合BR501菌株的表型和Deinococcus属具有代表性的D.RadioduransR1菌株的特征,将该菌株归属为Deinococcus属,初步命名为Deinococcus sp.BR501。 展开更多
关键词 耐辐射微生物 deinococcus SP 16S RDNA
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耐辐射球菌基因DRB0099缺失突变株的构建及逆境分析 被引量:2
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作者 常胜合 舒海燕 +7 位作者 陆辉明 华跃进 李宗伟 田双起 王雁萍 陈林海 谈重芳 秦广雍 《微生物学报》 CAS CSCD 北大核心 2008年第1期57-62,共6页
耐辐射球菌(Deinococcus radiodurans R1)有着极强的辐射抗性。研究其抗辐射的机理对于处理放射性废料有着潜在的应用价值。在耐辐射球菌的基因组中,许多序列的功能未知。其中DRB0099尤为引人注意。将DRB0099缺失突变构建该基因的突变... 耐辐射球菌(Deinococcus radiodurans R1)有着极强的辐射抗性。研究其抗辐射的机理对于处理放射性废料有着潜在的应用价值。在耐辐射球菌的基因组中,许多序列的功能未知。其中DRB0099尤为引人注意。将DRB0099缺失突变构建该基因的突变株。对野生型和突变体进行比较后发现,在正常生长条件下的前期阶段(0~16h),突变体生长速度比野生型慢。16h以后,野生型逐渐进入稳定生长期。这时,突变株的生长速度高于野生型。但是,野生型的浓度一直高于突变株。表明在DRB0099被删除后,耐辐射球菌的生长可能受到了阻滞。在紫外线照射的条件下,尽管野生型随着照射剂量的增加,存活率越来越低,但是要比突变体高许多。野生型具有比突变体更强的修复DNA双链断裂的能力。DRB0099可能直接参与了对DNA的修复。突变体对H2O2的敏感程度高于野生型,表明野生型耐辐射球菌在对抗活性氧保护其蛋白质、DNA或者DNA修复方面具有比突变体更强的功能。在低浓度H2O2处理条件下,尽管野生型和突变体的存活率都出现下降趋势,但二者的差值并不大。随着H2O2剂量的增加,二者的差值越来越大。表明随着活性氧浓度的增加,蛋白质和DNA损伤的数量增加,失去DRB0099基因功能的突变体比野生型更容易受到损伤。在紫外线照射处理或者H2O2处理条件下,DRB0099能够保护蛋白质和DNA。 展开更多
关键词 耐辐射球菌(deinococcus radiodurans R1):DRB0099 突变株
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荧光抗辐射菌的构建及其稳定性
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作者 屠振力 叶子期 +1 位作者 方俐晶 王家刚 《应用与环境生物学报》 CAS CSCD 北大核心 2012年第4期651-655,共5页
将构建的抗辐射菌属-大肠杆菌间的泛用穿梭表达载体pZTGL2导入抗辐射菌Deinococcus grandis,进行了荧光标识抗辐射菌的构建及其在没有抗生素的非选择性培养基中继代培养后的稳定性分析.结果表明,导入泛用穿梭表达载体pZTGL2后的D.grandi... 将构建的抗辐射菌属-大肠杆菌间的泛用穿梭表达载体pZTGL2导入抗辐射菌Deinococcus grandis,进行了荧光标识抗辐射菌的构建及其在没有抗生素的非选择性培养基中继代培养后的稳定性分析.结果表明,导入泛用穿梭表达载体pZTGL2后的D.grandis具有荧光活性,荧光标识的D.grandis在没有抗生素的培养基中经14 d继代培养后的最佳培养温度及其生长状况等生物学特性与未标识的D.grandis没有明显差异.进一步对荧光标识D.grandis在非选择性培养基中经14 d继代培养后的稳定性进行了调查,结果表明:荧光标识的D.grandis在没有抗生素的培养基中经过14 d的继代培养后的荧光活性与没有经过继代培养的荧光标识的D.grandis无显著差异,而且也没有改变荧光标识的D.grandis对γ-射线的抗性.由以上结果认为:成功构建了荧光标识的抗辐射菌D.grandis,荧光标识的D.grandis在非选择培养基中继代培养后仍能表现出良好的结构稳定性. 展开更多
关键词 抗辐射菌 deinococcus grandis 穿梭载体 荧光素酶基因 荧光活性 稳定性
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类核环形结构在耐辐射球菌电离辐射抗性中不起主要作用
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作者 高冠军 陆辉明 +1 位作者 尹龙飞 华跃进 《中国科学(C辑)》 CSCD 北大核心 2007年第3期333-337,共5页
近来基于透射电子显微镜研究的论点“耐辐射球菌(Deinococcus radiodurans)R1类核致密的环形结构是其极端辐射抗性的关键因素”已引起广泛争议.本文在以前研究基础上系统地比较了野生型R1菌株、pprI(DR0167)基因突变株YR1及pprI基因功... 近来基于透射电子显微镜研究的论点“耐辐射球菌(Deinococcus radiodurans)R1类核致密的环形结构是其极端辐射抗性的关键因素”已引起广泛争议.本文在以前研究基础上系统地比较了野生型R1菌株、pprI(DR0167)基因突变株YR1及pprI基因功能补偿株在电离辐射前后的类核结构的形态差异.荧光显微镜观察结果显示:(ⅰ)具有超强电离辐射抗性的野生型菌株R1细胞类核主要呈现紧凑的环形结构,而同样有环形类核结构的pprI突变株YR1细胞却对辐射非常敏感;(ⅱ)2个pprI基因功能补偿株,YR1001(pprI全基因功能补偿株)类核绝大多数呈现絮乱松散的不规则形态,YR1002(pprI部分基因功能补偿株)呈现约60%左右的环形类核结构,这两个菌株都具有与野生型R1同样的电离辐射抗性;(ⅲ)另一pprI部分基因功能补偿株YR1004(敲除pprI基因3′端333个碱基对)对电离辐射极其敏感,其约60%左右的细胞含有环形的类核结构.上述结果表明,耐辐射球菌类核的环形结构在辐射极端抗性中不起主要作用. 展开更多
关键词 耐辐射球菌(deinococcus radiodurans)R1 环形类核(Ring-like nucleoid)pprI 电离辐射
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