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Clinical Biochemistry of Domestic Animals (Sixth Edition) - UMK ...

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Copper<br />

Cuproreductase<br />

Cytochromes Cytochromes<br />

(a)<br />

Cp, Albumin, Others<br />

CRT1<br />

DCT1<br />

DMT1/Nramp2<br />

Cu<br />

Cytochromes<br />

Metallothionein<br />

Yeast ATOX, Homologue<br />

CuZnSOD<br />

Cu<br />

Cu<br />

Cu<br />

Cu<br />

Cu<br />

Manganese<br />

TfR<br />

Yeast<br />

Homologue <strong>of</strong><br />

Mtm 1 P<br />

Mn SOD<br />

Mn SOD<br />

Metal Oxyanion Transporters<br />

Transferrin[Mn]<br />

DCT1<br />

DMT1/Nramp2<br />

Ca/Mn ATPase<br />

Metal Oxyanion Transporters<br />

(b)<br />

Selenium<br />

Selenomethionine<br />

and Amino<br />

Se-Methylselenocysteine<br />

Selenoprotein-P<br />

Mn SOD<br />

Ferritin<br />

Se-Met<br />

Acid Transporters<br />

CH 3 SeH<br />

Se-Cys<br />

Mn SOD<br />

Protein<br />

Se-Cystathionine<br />

[-CH 3 ]<br />

(c)<br />

Sodium Selenite<br />

Metal<br />

Oxyanion Transporters<br />

Selenite GSSeSG<br />

GSH<br />

Selenite/Sulfite<br />

Reduction Pathways<br />

GSSG<br />

HSe - HSePO 4 -<br />

Ser-tRNA UGA<br />

Sec-tRNA<br />

Se-Specific<br />

Proteins<br />

Zinc<br />

Zn-Protein<br />

Zn-Amino Acid<br />

Complexes<br />

ZIP Family [n]<br />

L-type calcium<br />

channels (LTCC)<br />

Zn<br />

ZnT[n]<br />

ZnT[n]<br />

ZnT[n]<br />

DCT1<br />

DMT1/Nramp2<br />

Metallothionein<br />

ZnT[n]<br />

(d)<br />

FIGURE 22-4 Cellular transport. Features important to the transport <strong>of</strong> copper, manganese, selenium, and zinc are summarized. For features related<br />

to cobalt (and vitamin B 12 ), refer to the vitamin chapter and for molybdate see Figure 22-5. (a) Dietary copper is presented to intestinal cells in the<br />

form <strong>of</strong> protein and amino acid complexes, and in plasma, Cu is bound to a number <strong>of</strong> proteins; however, it is most <strong>of</strong>ten associated with albumin and<br />

ceruloplasmin. The transport and cellular metabolism <strong>of</strong> Cu depend on a series <strong>of</strong> membrane proteins and smaller soluble peptides that constitute a<br />

functionally integrated system for maintaining cellular Cu homeostasis. The high-affinity copper transporter (CTR1) <strong>of</strong> the plasma membrane mediates

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