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Inward-rectifier potassium channels (Kir, IRK) are a specific lipid-gated subset of potassium channels. To date, seven subfamilies have been identified in various mammalian cell types, plants, and bacteria. They are activated by phosphatidylinositol 4,5-bisphosphate (PIP2). The malfunction of the channels has been implicated in several diseases. IRK channels possess a pore domain, homologous to that of voltage-gated ion channels, and flanking transmembrane segments (TMSs). They may exist in the membrane as homo- or heterooligomers and each monomer possesses between 2 and 4 TMSs. In terms of function, these proteins transport potassium (K+), with a greater tendency for K+ uptake than K+ export. The process of inward-rectification was discovered by Denis Noble in cardiac muscle cells in 1960

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dbo:abstract
  • قناة أيون البوتاسيوم الداخلي المعدل أو قناة أيونات البوتاسيوم ذات الانتقائية بالاتجاه الداخلي (بالإنجليزية: Inward-rectifier potassium ion channel)‏ هي مجموعة فرعية مُعينة من الانتقائية. حتى الآن، وقد تم تحديد 7 تحت العوائل في مُختلف أنواع الخلايا الثديية. (ar)
  • Inward-rectifier potassium channels (Kir, IRK) are a specific lipid-gated subset of potassium channels. To date, seven subfamilies have been identified in various mammalian cell types, plants, and bacteria. They are activated by phosphatidylinositol 4,5-bisphosphate (PIP2). The malfunction of the channels has been implicated in several diseases. IRK channels possess a pore domain, homologous to that of voltage-gated ion channels, and flanking transmembrane segments (TMSs). They may exist in the membrane as homo- or heterooligomers and each monomer possesses between 2 and 4 TMSs. In terms of function, these proteins transport potassium (K+), with a greater tendency for K+ uptake than K+ export. The process of inward-rectification was discovered by Denis Noble in cardiac muscle cells in 1960s and by Richard Adrian and Alan Hodgkin in 1970 in skeletal muscle cells. (en)
  • Un courant potassique rectifiant entrant, (en anglais Inwardly Rectifying K+ current ou IKIR), est un courant causé par un canal ionique spécifique au potassium. Au potentiel de repos, le mouvement de ces ions est paradoxalement dans le sens sortant dans ce type de canal, depuis l'intérieur vers l'extérieur puisque le potentiel d'équilibre des ions de potassium (Ek) est plus négatif que le potentiel de repos. Cependant, en dessous des valeurs de repos, le mouvement des ions se fait dans le sens entrant dont la conductance est plus importante que dans le sens sortant, d'où leur appellation de canaux rectifieurs entrants. C'est la raison pour laquelle ce courant est qualifié d'entrant (mouvement entrant de charges positives). À ce jour, on a identifié sept sous-familles de ces canaux dans différents types de cellules de mammifères. Ils sont la cible de multiples toxines, et plusieurs maladies sont dues à un dysfonctionnement de ces canaux. (fr)
  • 내향성 칼륨 통로는 세포막에 존재하면서 칼륨을 통과시키는 막 단백질이다. 주로 세포막의 을 유지한다. 보다 에서 칼륨을 더 잘 통과시키지만 이는 전압 개폐 포타슘 채널의 개폐 기전과는 달리 세포 안 쪽에서 마그네슘이나 과 같은 양전하를 띤 물질들이 채널의 통로를 막기 때문에 일어나는 현상이다. 비록 의 크기가 훨씬 크지만 에 생리적 의미가 있다. 현재까지 일곱 종류가 발견되었다. (ko)
  • Калиевые каналы внутреннего выпрямления (Kir, IRK) — специфическое подмножество калиевых каналов. В настоящее время идентифицированы семь подсемейств калиевых каналов внутреннего выпрямления в клетках разных тканей животных различных видов. Калиевые каналы внутреннего выпрямления обнаружены также у растений и бактерий. Они являются мишенями для многих токсинов, а нарушение функционирования этих каналов приводит к различным заболеваниям. (ru)
dbo:symbol
  • IRK
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dbp:caption
  • crystal structure of an inward rectifier potassium channel (en)
dbp:interpro
  • IPR013521 (en)
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  • Inward rectifier potassium channel (en)
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  • 8 (xsd:integer)
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  • PF01007 (en)
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  • CL0030 (en)
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  • 1 (xsd:integer)
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  • IRK (en)
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  • قناة أيون البوتاسيوم الداخلي المعدل أو قناة أيونات البوتاسيوم ذات الانتقائية بالاتجاه الداخلي (بالإنجليزية: Inward-rectifier potassium ion channel)‏ هي مجموعة فرعية مُعينة من الانتقائية. حتى الآن، وقد تم تحديد 7 تحت العوائل في مُختلف أنواع الخلايا الثديية. (ar)
  • 내향성 칼륨 통로는 세포막에 존재하면서 칼륨을 통과시키는 막 단백질이다. 주로 세포막의 을 유지한다. 보다 에서 칼륨을 더 잘 통과시키지만 이는 전압 개폐 포타슘 채널의 개폐 기전과는 달리 세포 안 쪽에서 마그네슘이나 과 같은 양전하를 띤 물질들이 채널의 통로를 막기 때문에 일어나는 현상이다. 비록 의 크기가 훨씬 크지만 에 생리적 의미가 있다. 현재까지 일곱 종류가 발견되었다. (ko)
  • Калиевые каналы внутреннего выпрямления (Kir, IRK) — специфическое подмножество калиевых каналов. В настоящее время идентифицированы семь подсемейств калиевых каналов внутреннего выпрямления в клетках разных тканей животных различных видов. Калиевые каналы внутреннего выпрямления обнаружены также у растений и бактерий. Они являются мишенями для многих токсинов, а нарушение функционирования этих каналов приводит к различным заболеваниям. (ru)
  • Inward-rectifier potassium channels (Kir, IRK) are a specific lipid-gated subset of potassium channels. To date, seven subfamilies have been identified in various mammalian cell types, plants, and bacteria. They are activated by phosphatidylinositol 4,5-bisphosphate (PIP2). The malfunction of the channels has been implicated in several diseases. IRK channels possess a pore domain, homologous to that of voltage-gated ion channels, and flanking transmembrane segments (TMSs). They may exist in the membrane as homo- or heterooligomers and each monomer possesses between 2 and 4 TMSs. In terms of function, these proteins transport potassium (K+), with a greater tendency for K+ uptake than K+ export. The process of inward-rectification was discovered by Denis Noble in cardiac muscle cells in 1960 (en)
  • Un courant potassique rectifiant entrant, (en anglais Inwardly Rectifying K+ current ou IKIR), est un courant causé par un canal ionique spécifique au potassium. Au potentiel de repos, le mouvement de ces ions est paradoxalement dans le sens sortant dans ce type de canal, depuis l'intérieur vers l'extérieur puisque le potentiel d'équilibre des ions de potassium (Ek) est plus négatif que le potentiel de repos. Cependant, en dessous des valeurs de repos, le mouvement des ions se fait dans le sens entrant dont la conductance est plus importante que dans le sens sortant, d'où leur appellation de canaux rectifieurs entrants. C'est la raison pour laquelle ce courant est qualifié d'entrant (mouvement entrant de charges positives). À ce jour, on a identifié sept sous-familles de ces canaux dans di (fr)
rdfs:label
  • قناة أيون البوتاسيوم الداخلي المعدل (ar)
  • Courant potassique rectifiant entrant (fr)
  • Inward-rectifier potassium channel (en)
  • 내향성 칼륨 통로 (ko)
  • Калиевые каналы внутреннего выпрямления (ru)
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