Function

Hemolysin (HL) is exotoxin from bacteria which causes lysis of red blood cells[1]. Hemolysin from the bacterium Clostridium are called alpha-toxin (AT). AT is a zinc metalloenzyme and binds to the membrane in the presence of calcium. It acts as a phospholipase C.

See details for α-hemolysin in Pore forming toxin, α-hemolysin.

See details of hemolysin E in Molecular Playground/ClyA.

For toxins in Proteopdia see Toxins.

Relevance

HL acts as a virulence factor in the pathogenesis of invasive infections[2].

α-hemolysin heptamer (PDB code 7ahl).

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3D Structures of hemolysin3D Structures of hemolysin

3D Printed Physical Model of Hemolysin3D Printed Physical Model of Hemolysin

Shown below is a 3D printed physical model of Hemolysin. The model is shown in alpha carbon backbone format with each chain colored uniquely.

   

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Updated on 10-May-2018

A full page in Proteopedia exploring 7ahl is found here.

  • β-hemolysin
    • 3k55 – SaHL-β)
    • 3i5v - SaHL-β residues 35-330)
    • 3i41 - SaHL-β residues 35-330 (mutant)
    • 3i46, 3i48 - SaHL-β residues 35-330 (mutant)
      + metal ion
  • γ-hemolysin
    • 2qk7 – SaHL-γ component A (mutant) +B (mutant)
    • 3b07 - SaHL-γ component A+B
    • 4p1x - SaHL-γ component B (mutant)+C
    • 4p1y - SaHL-γ component A + B (mutant)
  • δ-hemolysin
    • 2kam – SaHL-δ - NMR
  • Hemolysin
    • 3o44 – VcHL residues 161-741 – Vibrio cholerae
    • 1xez – VcHL (mutant)
    • 3a57 – HL 2 – Vibrio parahaemolyticus
    • 3hvn – HL (mutant) – Streptococcus suis
    • 3fy3, 5keh, 5kf3, 4w8q – PmHL A residues 30-265 – Proteus mirabilis
    • 5sz8, 5kkd, 4w8r, 4w8s, 4w8t - PmHL A residues 30-234 (mutant)
    • 1mt0 – EcHL B ATP-binding domain – Escherichia coli
    • 5c21, 5c22 - EcHL D residues 57-333
    • 2wcd – EcHL E residues 2-303 – Escherichia coli
    • 1qoy, 4pho, 4phq - EcHL E (mutant)
    • 2oai, 2r8d – HL corc_hlyc domain – Xylella fastidiosa
    • 2r2z – HL residues 346-435 – Enterococcus faecalis
    • 4wx3, 4wx5 - HL – Grimontia hollisae
  • Alpha-toxin
    • 2wxt, 1ca1 - CpAT + Cd + Zn – Clostridium perfringens
    • 1qm6, 1gyg, 1kho - CpAT + Zn
    • 2wy6, 2wxu – CpAT (mutant) + Ca + Cd + Zn
    • 1qmd - CpAT + Ca + Zn
    • 1olp - AT + Ca + Zn – Clostridium absonum
    • 2vk9 - AT – Clostridium novyi

ReferencesReferences

  1. Mestre MB, Fader CM, Sola C, Colombo MI. Alpha-hemolysin is required for the activation of the autophagic pathway in Staphylococcus aureus-infected cells. Autophagy. 2010 Jan;6(1):110-25. PMID:20110774
  2. Nizet V. Streptococcal beta-hemolysins: genetics and role in disease pathogenesis. Trends Microbiol. 2002 Dec;10(12):575-80. PMID:12564994

Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

Wayne Decatur, Alexander Berchansky, Michal Harel, Mark Hoelzer