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Chapter 26 815
Copyright © 2017 Pearson Education, Inc.
anticodons
CAU AUC AGG AAC AAU UUU AUG
GUC GGG GAC GAU CUU GUG
UGG UAC UAU
CGG CAC
Notice that the anticodons are written in the 5
S
3 direction. For example, the anticodon of AUG is
written as CAU (not UAC).
codon 5 A U G 3
anticodon 3 U A C 5
15.
N
N N
H
N
NH
2
adenine
HN
N N
H
N
NH
H
2
O
HN
N N
H
N
O
hypoxanthine
+
NH
3
HN
N N
H
N
O
guanine
HN
N
H
N
H
N
O
H
2
O
HN
N
H
N
H
N
O
O
xanthine
+
NH
3
H
2
N
HN
16.
Deamination involves hydrolyzing an imine to form a carbonyl group and ammonia.
+ NH
3
H
2
O
deamination
an imine
N
N
H
NH
2
O
HN
N
H
uracil
cytosine
O
O
HN
N
H
NH
O
Thymine does not have an amino substituent on the ring, which means that it cannot form an imine and,
therefore, cannot be deaminated.
thymine
HN
N
H
O
CH
3
O