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Triplet (biologia).
Un triplet és la seqüència de tres nucleòtids en un àcid nucleic, i en particular en un ARN missatger.
Els triplets de l'ADN reben el nom de codó.
Taula 1: 64 triplets possibles i aminoàcid que codifiquen.
|
2ª base
|
U
|
C
|
A
|
G
|
1.ª base
|
U
|
UUU Fenilalanina
UUC Fenilalanina
UUA Leucina
UUG Leucina
|
UCU Serina
UCC Serina
UCA Serina
UCG Serina
|
UAU Tirosina
UAC Tirosina
UAA codó d'aturada Ocre
UAG 3codó d'aturada Ambre
|
UGU cisteïna
UGC cisteïna
UGA 2codó d'aturada Òpal
UGG triptofan
|
C
|
CUU Leucina
CUC Leucina
CUA Leucina
CUG 4Leucina
|
CCU Prolina
CCC Prolina
CCA Prolina
CCG Prolina
|
CAU Histidina
CAC Histidina
CAA Glutamina
CAG Glutamina
|
CGU Arginina
CGC Arginina
CGA Arginina
CGG Arginina
|
A
|
AUU Isoleucina
AUC Isoleucina
AUA Isoleucina
AUG 1Metionina
|
ACU Treonina
ACC Treonina
ACA Treonina
ACG Treonina
|
AAU Asparagina
AAC Asparagina
AAA Lisina
AAG Lisina
|
AGU Serina
AGC Serina
AGA Arginina
AGG Arginina
|
G
|
GUU Valina
GUC Valina
GUA Valina
GUG Valina
|
GCU Alanina
GCC Alanina
GCA Alanina
GCG Alanina
|
GAU àcid aspàrtic
GAC àcid aspàrtic
GAA àcid glutàmic
GAG àcid glutàmic
|
GGU Glicina
GGC Glicina
GGA Glicina
GGG Glicina
|
|
- El codó AUG codifica la metionina, i a més fa d'indret d'inici; el primer AUG en un ARNm codifica l'indret on s'inicia la traducció de proteïnes.
- En alguns microorganismes, el codó UGA codifica com selenocisteïna.
- En alguns bacteris el codó UAG codifica la pirrolisina.
- El codó CUG (Leu) és el codó d'inici per un dels dos productes alternatius del gen c-myc humà (Hann et al., 1987)[1]
|
- Biologia i Geologia de 4 ESO, editorial Santillana, Projecte La Casa del Saber. Especialitzat en Illes Balears. Imprès el 2008.
- Definició del diccionari de la Real Academia Espanyola.
Viccionari
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