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O O H H
C HO C O O HO (Tyr)
(Glu) O (Tyr) (Glu) R

H H C N H
O R O r
Zn C N H
N N (His) + O r Zn
(His) O O (His) N O O N (His)
C
(Glu) C
(Glu)
R = Restprotein C O H O

r = CH CO 2 H (Glu) O R OH H (Tyr)
R' C N H
+ H 2 O O r
Zn
R H (His) N O O N (His)
C OH + H N C
O r (Glu)
Figure 25. Reaction course of the peptide hydrolysis by carboxypeptidase. r = -CH(R’)-CO 2H;
R = residual protein.

H H H CH 2 R CH 2 R
O O O O
S Zn N + HOCH 2 R S Zn Zn
S S N - H 2 O S S N
NAD + +
NAD NAD +

H O H CHR
- H + Zn O
S S N + H 2 O Zn
S S N
NAD + - RCHO, H + 2e -
+
NADH

Figure 26. Reaction course of the enzymatic oxidation of primary alcohols by
alcoholdehydrogenase.

Zinc and the genetic transcription (Zinc fingers)

Nucleus Ribosome
RNA-synthase (t-RNA) protein
DNA m-RNA synthesis
transcription factor

Transcription Translation