Acides aminés Flashcards

1
Q

Isoleucine

A

ile, I

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2
Q

configuration de l’isoleucine chez l’humain

A

2S, 3S

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3
Q

masse moyenne d’un acide aminé

A

110 Da

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4
Q

fonction carboxyle COOH

A

pKa(alpha-COOH) = pK2 = 2.1

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5
Q

masse de Gly

A

75 Da

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6
Q

rôle des acides aminés

A

rôle métabolique, rôle de médiateurs chimiques (ou précurseurs)

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7
Q

masse de Trp

A

204

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8
Q

cation

A
  • pH très acide (en dessous des pKa)
  • tous les groupements sont protonés
  • AA chargé positivement
  • charge nette = +1
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9
Q

anion

A
  • pH très basique (au dessus des pKa)
  • tous les groupements sont déprotonés
  • AA chargé négativement
  • charge nette = -1
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10
Q

zwitterion

A
  • forme neutre de l’AA
  • charge nette nulle
  • l’AA est ionique, dipolaire et éléctriquement neutre
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11
Q

les 3 formes des AA sans pKr

A

cation, zwitterion, anion

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