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Membrane-pore forming characteristics of the bordetella pertussis cyaa-hemolysin domain
Kurehong C. - ไม่ระบุหน่วยงาน
ชื่อเรื่อง (EN): Membrane-pore forming characteristics of the bordetella pertussis cyaa-hemolysin domain
ผู้แต่ง / หัวหน้าโครงการ (EN): Kurehong C.
บทคัดย่อ (EN): Previously, the 126-kDa Bordetella pertussis CyaA pore-forming/hemolysin (CyaA-Hly) domain was shown to retain its hemolytic activity causing lysis of susceptible erythrocytes. Here, we have succeeded in producing, at large quantity and high purity, the His-tagged CyaA-Hly domain over-expressed in Escherichia coli as a soluble hemolytically-active form. Quantitative assays of hemolysis against sheep erythrocytes revealed that the purified CyaA-Hly domain could function cooperatively by forming an oligomeric pore in the target cell membrane with a Hill coefficient of ~3. When the CyaA-Hly toxin was incorporated into planar lipid bilayers (PLBs) under symmetrical conditions at 1.0 M KCl, 10 mM HEPES buffer (pH 7.4), it produced a clearly resolved single channel with a maximum conductance of ~35 pS. PLB results also revealed that the CyaA-Hly induced channel was unidirectional and opened more frequently at higher negative membrane potentials. Altogether, our results first provide more insights into pore-forming characteristics of the CyaA-Hly domain as being the major pore-forming determinant of which the ability to induce such ion channels in receptor-free membranes could account for its cooperative hemolytic action on the target erythrocytes. © 2015 by the authors; licensee MDPI, Basel, Switzerland.
บทคัดย่อ: ไม่พบข้อมูลจากหน่วยงานต้นทาง
ภาษา (EN): en
เอกสารแนบ (EN): https://www.scopus.com/inward/record.uri?eid=2-s2.0-84929301766&doi=10.3390%2ftoxins7051486&partnerID=40&md5=7dab1910f48f5412d9bc3986f23fd68e
เผยแพร่โดย (EN): มหาวิทยาลัยมหิดล
คำสำคัญ (EN): Sheep
เจ้าของลิขสิทธิ์ (EN): มหาวิทยาลัยมหิดล
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Membrane-pore forming characteristics of the bordetella pertussis cyaa-hemolysin domain
Kurehong C.
มหาวิทยาลัยมหิดล
ไม่ระบุวันที่เผยแพร่
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