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The thiol-activated Cholesterol-dependent Cytolysin (CDC) family (TC# 1.C.12) is a member of the MACPF superfamily. Cholesterol dependent cytolysins are a family of β-barrel pore-forming exotoxins that are secreted by gram-positive bacteria. CDCs are secreted as water-soluble monomers of 50-70 kDa, that when bound to the target cell, form a circular homo-oligomeric complex containing as many as 40 (or more) monomers. Through multiple conformational changes, the β-barrel transmembrane structure (~250 Å in diameter depending on the toxin) is formed and inserted into the target cell membrane. The presence of cholesterol in the target membrane is required for pore formation, though the presence of cholesterol is not required by all CDCs for binding. For example, intermedilysin (ILY; TC# 1.C.12

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  • The thiol-activated Cholesterol-dependent Cytolysin (CDC) family (TC# 1.C.12) is a member of the MACPF superfamily. Cholesterol dependent cytolysins are a family of β-barrel pore-forming exotoxins that are secreted by gram-positive bacteria. CDCs are secreted as water-soluble monomers of 50-70 kDa, that when bound to the target cell, form a circular homo-oligomeric complex containing as many as 40 (or more) monomers. Through multiple conformational changes, the β-barrel transmembrane structure (~250 Å in diameter depending on the toxin) is formed and inserted into the target cell membrane. The presence of cholesterol in the target membrane is required for pore formation, though the presence of cholesterol is not required by all CDCs for binding. For example, intermedilysin (ILY; TC# 1.C.12.1.5) secreted by Streptococcus intermedius will bind only to target membranes containing a specific protein receptor, independent of the presence of cholesterol, but cholesterol is required by intermedilysin (ILY; TC# 1.C.12.1.5) for pore formation. While the lipid environment of cholesterol in the membrane can affect toxin binding, the exact molecular mechanism that cholesterol regulates the cytolytic activity of the CDC is not fully understood. (en)
  • コレステロール依存性細胞溶解素(Cholesterol dependent cytolysin:CDC)は、グラム陽性細菌によって分泌されるβバレル型膜孔形成毒素のファミリーである。分泌された直後は50〜70kDaの水溶性単量体で、標的細胞膜に結合すると40個(またはそれ以上)の単量体で環状ホモオリゴマー複合体を形成する。複数の構造変化を介して、βバレルの膜貫通構造(直径約250Å以上)が形成され、標的細胞膜を貫く。CDCは標的細胞膜への結合に標的細胞膜中のコレステロールを必ずしも要求しないが、膜孔形成に必要とする。例えば、Streptococcus intermediusによって分泌されるインターメディシリン(ILY; TC# 1.C.12.1.5)は、コレステロールの存在とは無関係に、特異的タンパク質受容体のある標的膜にのみ結合するが、膜孔形成にコレステロールを要求する。ただし、CDCがどのようにコレステロールから活性の調節を受けるかは明らかになっていない。 (ja)
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  • Thiol_cytolysin
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  • IPR001869 (en)
dbp:name
  • Cholesterol-binding cytolysin (en)
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  • 108 (xsd:integer)
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dbp:pfam
  • PF01289 (en)
dbp:prosite
  • PDOC00436 (en)
dbp:symbol
  • Thiol_cytolysin (en)
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  • コレステロール依存性細胞溶解素(Cholesterol dependent cytolysin:CDC)は、グラム陽性細菌によって分泌されるβバレル型膜孔形成毒素のファミリーである。分泌された直後は50〜70kDaの水溶性単量体で、標的細胞膜に結合すると40個(またはそれ以上)の単量体で環状ホモオリゴマー複合体を形成する。複数の構造変化を介して、βバレルの膜貫通構造(直径約250Å以上)が形成され、標的細胞膜を貫く。CDCは標的細胞膜への結合に標的細胞膜中のコレステロールを必ずしも要求しないが、膜孔形成に必要とする。例えば、Streptococcus intermediusによって分泌されるインターメディシリン(ILY; TC# 1.C.12.1.5)は、コレステロールの存在とは無関係に、特異的タンパク質受容体のある標的膜にのみ結合するが、膜孔形成にコレステロールを要求する。ただし、CDCがどのようにコレステロールから活性の調節を受けるかは明らかになっていない。 (ja)
  • The thiol-activated Cholesterol-dependent Cytolysin (CDC) family (TC# 1.C.12) is a member of the MACPF superfamily. Cholesterol dependent cytolysins are a family of β-barrel pore-forming exotoxins that are secreted by gram-positive bacteria. CDCs are secreted as water-soluble monomers of 50-70 kDa, that when bound to the target cell, form a circular homo-oligomeric complex containing as many as 40 (or more) monomers. Through multiple conformational changes, the β-barrel transmembrane structure (~250 Å in diameter depending on the toxin) is formed and inserted into the target cell membrane. The presence of cholesterol in the target membrane is required for pore formation, though the presence of cholesterol is not required by all CDCs for binding. For example, intermedilysin (ILY; TC# 1.C.12 (en)
rdfs:label
  • Cholesterol-dependent cytolysin (en)
  • コレステロール依存性細胞溶解素 (ja)
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