pompes ioniques Flashcards

1
Q

pompes ioniques

A

Na/K/ATPase -> pompe à sodium
H/K/ATPase -> pompe à protons

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2
Q

structure Na/K/ATPas

A

1 grosse SUalpha -> + 10 segments transmembr
1SUß -> 1segment transmbr
1SUgamma
N et C-term extrac
site liaison ATP intrac
transport electrogène

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3
Q

localisation Na/K/ATPas

A

toutes c mais ++ sur c avec activité électrique

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4
Q

fonction Na/K/ATPas

A

maintient gradient transmbr
retour aux c de départ avant contraction
fonctionne selon cycle catalytique

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5
Q

régulation Na/K/ATPas

A

par concentration des ions
homrones
réaction phosphorylation

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6
Q

pharmaco Na/K/ATPas

A

inhibiteur = digitaliques cardiotoniques -> digoxine

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7
Q

structure H/K/APTase

A

22SU alpha et ß
transporteur electroneutre
plusieurs isoformes

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8
Q

localisation H/K/APTase

A

colon, rein, estomac (pariétal++)

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9
Q

fonction H/K/APTase

A

maintient acidité gastrique -> expulse H+ dans lumière estomac

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10
Q

pharmaco H/K/APTase

A

inhibiteurs sélectif réversible : oméoprazole, lansoprazole, pantoprazole

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