Spontaneous oligomerization of a staphylococcal α-hemolysin conformationally constrained by removal of residues that form the transmembrane β-barrel

Stephen Cheley, M. S. Malghani, Langzhou Song, Michael Hobaugh, Eric Gouaux, Jie Yang, Hagan Bayley

Research output: Contribution to journalArticle

74 Citations (Scopus)

Abstract

Staphylococcal α-hemolysin is a water soluble, monomeric, bacterial exotoxin, which forms heptameric pores in membranes. The rate determining step in assembly is the conversion of a heptameric prepore to the fully assembled pore in which the central glycine-rich domain of each subunit inserts into the membrane to form a 14 strand β barrel. Barrel formation is accompanied by a conformational change in which each N terminus latches onto an adjacent subunit. In the monomer in solution, the central domain is loosely organized and exposed to solvent. In this study, 25 amino acids of the central domain were removed and replaced with the sequence Asp-Gly, which favors the formation of a type I' β-turn, to yield a mutant devoid of hemolytic activity. Within minutes after synthesis in the absence of membranes, the mutant polypeptide spontaneously assembled into heptamers, as demonstrated by atomic force microscopy. Limited proteolysis suggested that the N termini of the subunits in the heptamers were in the fully assembled pore conformation rather than the prepore conformation. Based on these findings, the deletion is proposed to constrain the central domain and thereby force the creation of a shortened β barrel, which in turn induces the additional structural changes that normally accompany pore formation. The truncated pore might make a useful framework for the construction of designed membrane active macromolecules.

Original languageEnglish (US)
Pages (from-to)1433-1443
Number of pages11
JournalProtein Engineering
Volume10
Issue number12
StatePublished - Dec 1997
Externally publishedYes

Fingerprint

Oligomerization
Hemolysin Proteins
Membranes
aspartylglycine
Conformations
Amino acids
Proteolysis
Exotoxins
Die casting inserts
Atomic Force Microscopy
Polypeptides
Macromolecules
Glycine
Atomic force microscopy
Monomers
Amino Acids
Peptides
Water

Keywords

  • α-hemolysin
  • α-toxin
  • Channel
  • Pore
  • Transmembrane β-barrel

ASJC Scopus subject areas

  • Molecular Biology
  • Biochemistry

Cite this

Spontaneous oligomerization of a staphylococcal α-hemolysin conformationally constrained by removal of residues that form the transmembrane β-barrel. / Cheley, Stephen; Malghani, M. S.; Song, Langzhou; Hobaugh, Michael; Gouaux, Eric; Yang, Jie; Bayley, Hagan.

In: Protein Engineering, Vol. 10, No. 12, 12.1997, p. 1433-1443.

Research output: Contribution to journalArticle

Cheley, Stephen ; Malghani, M. S. ; Song, Langzhou ; Hobaugh, Michael ; Gouaux, Eric ; Yang, Jie ; Bayley, Hagan. / Spontaneous oligomerization of a staphylococcal α-hemolysin conformationally constrained by removal of residues that form the transmembrane β-barrel. In: Protein Engineering. 1997 ; Vol. 10, No. 12. pp. 1433-1443.
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