Hemoglobin Structure And Synthesis

<div dir="ltr" style="text-align: left;" trbidi="on"><table align="center" cellpadding="0" cellspacing="0" class="tr-caption-container" style="float: left; margin-right: 1em; text-align: left;"><tbody><tr><td style="text-align: center;"><a href="http://4.bp.blogspot.com/-iIv_3bjj-tU/UHa3JJFh0II/AAAAAAAAACo/Q1ZXns-v-Tg/s1600/Structure+Of+The+Heme+Molecule+-+PathLabStudy.png" imageanchor="1" style="margin-left: auto; margin-right: auto;"><img border="0" height="200" src="http://4.bp.blogspot.com/-iIv_3bjj-tU/UHa3JJFh0II/AAAAAAAAACo/Q1ZXns-v-Tg/s200/Structure+Of+The+Heme+Molecule+-+PathLabStudy.png" width="200" /></a></td></tr><tr><td class="tr-caption" style="text-align: center;"><b>Structure Of Heme Molecule</b></td></tr></tbody></table><!--[if gte mso 9]><xml> <w:LatentStyles DefLockedState="false" LatentStyleCount="156"> </w:LatentStyles></xml><![endif]--><!--[if gte mso 10]><style> /* Style Definitions */ table.MsoNormalTable {mso-style-name:"Table Normal"; mso-tstyle-rowband-size:0; mso-tstyle-colband-size:0; mso-style-noshow:yes; mso-style-parent:""; mso-padding-alt:0in 5.4pt 0in 5.4pt; mso-para-margin:0in; mso-para-margin-bottom:.0001pt; mso-pagination:widow-orphan; font-size:10.0pt; font-family:"Times New Roman"; mso-ansi-language:#0400; mso-fareast-language:#0400; mso-bidi-language:#0400;} </style><![endif]--> <br /><div class="MsoNormal" style="text-align: justify;">Hemoglobin is made up of the protein, globin and heme. In normal adult hemoglobin, the globin portion of each molecule consists of four polypeptide chains: two alpha and beta chains. These chains, in turn, are composed of 141 and 146 amino acids (Arranged in a specific sequence), respectively. Each chain is bent and coiled. The heme group is composed of four pyrrole rings connected by methene bridges. In the center of this structure is an atom of iron to which oxygen is attached, when the iron is in the ferrous state (Fe--). One heme molecule will be attached to each of the alpha and beta chains come together to form a tetramer. The single hemoglobin molecule, therefore, consists of two alpha chains, two beta chains, and four heme groups (thus, four atoms of iron). Mature red blood cells are incapable of hemoglobin synthesis. The production of heme and globin takes place independently of each other, beginning in the polychromatic normoblast, and ending in the reticulocyte stage. The pyrrole rings, connected by the methene bridges, are formed in the cytoplasm and mitochondria of the red cell precursor. The globin is manufactured in the ribosomes of the immature red cell. The transfer of iron into the red cell precursor is carried out by transferrin, a globulin (also called siderophilin). Each molecule of transferrin can bind two molecule of iron. The transferrin attaches to the red cell, and the iron passes through the membrane and into the red cell to form the completed heme molecule each heme group then becomes attached to an alpha or beta chain. Two of these alpha chains and two beta chains then combine with each other to form the completed hemoglobin molecule.</div></div>

Hemoglobin Structure And Synthesis

Structure Of Heme Molecule Hemoglobin is made up of the protein, globin and heme. In normal adult hemoglobin, the globin portion of each mo...

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