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PNAS:中国科学家揭示细菌淀粉样纤维(β-amyloids)分泌通道结构

2014-12-04 佚名 生物谷

CsgG形成的跨膜九聚体通道结构 2014年12月1日,PNAS杂志最近发表了来自中国科学院生物物理研究所黄亿华等人题为《Structure of the nonameric bacterial amyloid secretion channel》的研究成果,详细介绍了它们对对负责细菌表面淀粉样纤维(β-amyloids)分泌通道的结构解析成果。 随着医疗技术的提高,人们已经征服了许多重大

CsgG形成的跨膜九聚体通道结构

2014年12月1日,PNAS杂志最近发表了来自中国科学院生物物理研究所黄亿华等人题为《Structure of the nonameric bacterial amyloid secretion channel》的研究成果,详细介绍了它们对对负责细菌表面淀粉样纤维(β-amyloids)分泌通道的结构解析成果。

随着医疗技术的提高,人们已经征服了许多重大疾病。不幸的是截止到目前为止,人们对于以阿尔兹海默症为代表的神经退行性疾病仍然束手无策。淀粉样纤维蛋白一直被认为与这些神经退行性疾病有着密切关系。因此在这一领域的研究也成为近年来生物研究的热点。在细菌表面,存在一类功能性的淀粉样纤维(Curli), 为细菌形成菌膜(biofilm)所必需。黄亿华研究组成功解析了负责curli分泌的通道蛋白CsgG九聚体2.9埃的晶体结构。研究显示,CsgG通过9聚化,由每个单体贡献4条跨膜β链,形成了一个跨越细菌外膜由36条β链所组成的分泌通道。这是目前已知的在细菌外膜上最大的、由最多β链所围成的β桶状整合膜蛋白。该通道的选择性由向内突出的氨基酸形成的垛叠环限制,大小只有12 埃,表明组成curli的亚基是以一种未折叠的方式穿过CsgG通道。在结构的基础上,通过细菌遗传学实验和生物化学分析,阐释了功能性淀粉样纤维生物生成的机理,并可为设计抑制菌膜形成的新型抗生素提供重要信息。

原始出处:

Baohua Cao, Yan Zhao, Yongjun Kou, Dongchun Ni,Xuejun Cai Zhang, and Yihua Huang.Structure of the nonameric bacterial amyloid secretion channel.PNAS.2014

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    2015-08-27 liuxiaona
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    2015-05-12 gwc392
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    2015-11-10 drwjr
  6. [GetPortalCommentsPageByObjectIdResponse(id=1779879, encodeId=9c8b1e798798e, content=<a href='/topic/show?id=9d29246ebd' target=_blank style='color:#2F92EE;'>#Amyloid#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=46, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=2467, encryptionId=9d29246ebd, topicName=Amyloid)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=cb3a261, createdName=liuxiaona, createdTime=Thu Aug 27 01:15:00 CST 2015, time=2015-08-27, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1682192, encodeId=404916821928e, content=<a href='/topic/show?id=d4d031e8074' target=_blank style='color:#2F92EE;'>#分泌#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=31780, encryptionId=d4d031e8074, topicName=分泌)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=0da227938338, createdName=gwc392, createdTime=Tue May 12 08:15:00 CST 2015, time=2015-05-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1986199, encodeId=23b6198619989, content=<a href='/topic/show?id=83f3659281c' target=_blank style='color:#2F92EE;'>#淀粉样纤维#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=67, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=65928, encryptionId=83f3659281c, topicName=淀粉样纤维)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=a12645, createdName=docwu2019, createdTime=Tue Mar 24 10:15:00 CST 2015, time=2015-03-24, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=2024203, encodeId=e97b20242034e, content=<a href='/topic/show?id=79f4219392b' target=_blank style='color:#2F92EE;'>#中国科学#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=52, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=21939, encryptionId=79f4219392b, topicName=中国科学)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=66ec123, createdName=guihongzh, createdTime=Thu Mar 12 07:15:00 CST 2015, time=2015-03-12, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1855669, encodeId=431918556690b, content=<a href='/topic/show?id=f32014428fc' target=_blank style='color:#2F92EE;'>#PNAS#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=72, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=14428, encryptionId=f32014428fc, topicName=PNAS)], attachment=null, authenticateStatus=null, createdAvatar=, createdBy=08e964, createdName=drwjr, createdTime=Tue Nov 10 11:15:00 CST 2015, time=2015-11-10, status=1, ipAttribution=), GetPortalCommentsPageByObjectIdResponse(id=1516871, encodeId=b35f15168e169, content=<a href='/topic/show?id=f1232194031' target=_blank style='color:#2F92EE;'>#中国科学家#</a>, beContent=null, objectType=article, channel=null, level=null, likeNumber=72, replyNumber=0, topicName=null, topicId=null, topicList=[TopicDto(id=21940, encryptionId=f1232194031, topicName=中国科学家)], attachment=null, authenticateStatus=null, createdAvatar=null, createdBy=cbca11021083, createdName=12498e5fm15(暂无昵称), createdTime=Sat Dec 06 00:15:00 CST 2014, time=2014-12-06, status=1, ipAttribution=)]
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