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1 Department of Medical Biochemistry and Genetics, The Texas A&M University System Health Science Center, College Station, Texas 77843–1114, USA
2 Department of Chemistry, Texas A&M University, College Station, Texas 77843–3255, USA
Reprint requests to: Hagan Bayley, Department of Medical Biochemistry and Genetics, The Texas A&M University System Health Science Center, College Station, TX 77843-1114, USA; e-mail: bayley{at}tamu.edu; fax: (979) 847-9481.
Staphylococcal leukocidin pores are formed by the obligatory interaction of two distinct polypeptides, one of class F and one of class S, making them unique in the family of ß-barrel pore-forming toxins (ß-PFTs). By contrast, other ß-PFTs form homo-oligomeric pores; for example, the staphylococcal 
-hemolysin (HL) pore is a homoheptamer. Here, we deduce the subunit composition of a leukocidin pore by two independent methods: gel shift electrophoresis and site-specific chemical modification during single-channel recording. Four LukF and four LukS subunits coassemble to form an octamer. This result in part explains properties of the leukocidin pore, such as its high conductance compared to the HL pore. It is also pertinent to the mechanism of assembly of ß-PFT pores and suggests new possibilities for engineering these proteins.
Keywords: ß barrel; leukocidin; membrane protein; pore-forming toxin; protein-protein interaction; staphylococcal -hemolysin; subunit stoichiometry
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