Melanin, the Master Molecule by Arturo Solis Herrera;

Author:Arturo Solis Herrera;
Language: eng
Format: epub
ISBN: 978-1-68108-654-5
Publisher: Libreka GmbH
Published: 2020-06-01T00:00:00+00:00

Hemoglobin

The basic molecular unit of the hemoglobin consists of a heme group (Fig. 1) attached to a protein part or globin. All the hemoglobin heme groups are identical. The physical and chemical properties of the hemoglobin changes in different species, and in any species, you can find several different hemoglobin.

Fig. (1))

Heme consists of a porphyrin ring that holds a central iron. Porphyrin is the name of purple -colored stone. Besides hemoglobin, heme is also found in many cytochromes, and comprises various classes of enzymes and electron carriers. The combination of the heme with the oxygen group is not an oxidation of iron to ferric Heme State. If so, it could not carry oxygen and is what happens with the hemoglobin goal. The heme, as other porphyrin, shows a characteristic absorption spectrum, and can be, although slightly, influenced by the nature of the globin part. The unit of the hemoglobin molecule is a group heme and globin associated unit, which often are unique to form large molecules. In vertebrates are usually units of 4 molecules.

The similarity of the heme group with chlorophyll (Fig. 2) is notable. On the other hand, the hemoglobin are most widely spread respiratory pigments. They are the only respiratory pigments of vertebrates and their blood contains hemoglobin. The hemoglobin of muscles are called myoglobin and vertebrate always appear as a single molecule units. They tend to be concentrated in different muscles active, such as the heart; to who gives the characteristic reddish color.

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