Busaba PowthongchinChanan AngsuthanasombatMahidol UniversitySilpakorn University2018-07-122018-07-122008-02-01Archives of Microbiology. Vol.189, No.2 (2008), 169-174030289332-s2.0-38049155783https://repository.li.mahidol.ac.th/handle/123456789/19373Bordetella pertussis adenylate cyclase toxin-haemolysin (CyaA) can permeabilise erythrocytes by forming lytic pores. Here, a gene segment encoding CyaA pore-forming (CyaA-PF) domain cloned from genomic DNA of B. pertussis Thai isolate was over-expressed in Escherichia coli as a 126-kDa soluble protein which cross-reacted with anti-RTX monoclonal antibody. By co-expressing with acyltransferase CyaC, the CyaA-PF protein was found palmitoylated at Lys983. Unlike E. coli lysate with the non-acylated form, the lysate containing acylated CyaA-PF exhibited high haemolytic activity against sheep erythrocytes. This study presents that the recombinant CyaA-PF protein comprising pore-forming domain can be expressed separately as soluble native-folded precursor that conserves at least part of its functionality. © 2007 Springer-Verlag.Mahidol UniversityImmunology and MicrobiologyArticleSCOPUS10.1007/s00203-007-0302-1