protein as a means of transportation

Proteins are complex organic compounds which are polymers of amino acid monomers are connected to each other by peptide bonds. Protein molecules containing carbon, hydrogen, oxygen, nitrogen and sometimes sulfur and phosphorus. Some functions of proteins are:
Protein Function
1. Enzyme
2. Transport Proteins: Hemoglobin and Myoglobin
3. Regulatory Proteins: Hormones
4. Contractile Protein
5. Protein Structural
6. Protein Defense
7. Protein Nutrient and Storage
One of the functions that will be discussed in more focus is on the transport protein (protein transport).
Transport protein has the ability to bind to specific molecules and transporting various substances from one organ to other organs through the bloodstream. For example, hemoglobin, consisting of clusters of iron-containing compounds hame bound globin protein, functions as a carrier of oxygen in the blood of vertebrates; hemosianin, as an oxygen carrier in the blood of some kinds of invertebrates; serum albumin, fatty acid transporters in the blood; ceruloplasmin, copper ion transporters in the blood.
Transport protein is a protein that can bind and carry distinctive molecules or ions from one organ to another organ. Transport protein in the blood plasma bind and carry specific molecules or ions from one organ to another organ. An example is the transport protein myoglobin. Myoglobin is an oxygen-binding protein is relatively small (BM 16 700) found in muscle cells. Its function is to store and oxygen bound to increase oxygen transport to the mitochondria, which use oxygen for the oxidation of cell nutrients.
Another example is hemoglobin, which is a transport protein found in red blood cells. Hemoglobin can bind oxygen when the blood through the lungs. Oxygen was taken and released on peripheral tissues that can be used to oxidize nutrients (food) into energy. In blood plasma there is a lipoprotein that serves to transport lipids from the liver to the organ. Other transport proteins present in the cell membrane serves to bring some molecules such as glucose, amino acids and other nutrients through the membrane into the cell.
Hemoglobin molecule is a tetramer a2b2 consisting of 2 identical chains A and 2 B chains are identical. Subunits a and b of the structure and evolution connected to each other and to myoglobin, a monomeric binding oxygen in the muscles. The structure of hemoglobin (hemoglobin tetramer) is a spheroidal molecule with dimensions of 64x55x50 Armstrong. Two of his ab protomer connected symmetrically by two folds rotation. Hemoglobin compose 33% of the weight of the human body. Hemoglobin is one of the first protein molecular mass can be determined accurately, the first protein characterized by ultra centrifugation and associated with specific physiological functions (of the oxygen transport), and in sickle cell anemia is the first in demonstrating the mutation that causes a single amino acid change . Hemoglobin is not just a simple oxygen tank, but of a modern oxygen-carrying system that provides an accurate amount of oxygen into jarngan-network under any circumstances. Hemoglobin carries oxygen from the lungs, gills, or animal skin into capillaries that function in respiration. Very small organisms that do not need protein as it needs to be paid back respirasinya simple passive diffusion of oxygen throughout the body. However, because the rate of diffusion transport of substances varies inversely with the rank of the distance that must be taken, the rate of oxygen diffusion along the network thicker than 1mm is too slow to sustain life. Therefore, the evolution of large and complex organisms, such as annelids (eg earthworms), requires the development of an active circulation system carries oxygen and nutrients to the bloodstream for these organisms must have oxygen carriers such as hemoglobin because the solubility of oxygen in the blood plasma is too low to carry enough oxygen for metabolic needs.

By kinglalawave

5 comments on “protein as a means of transportation

  1. In the article mentioned that Myoglobin is an oxygen-binding protein found in the relatively small muscle cells. If the people doing extra activities such as weightlifting and other athletes with the goal of enlarging muscle, it must be a lot of high-protein foods. What if the athlete was stopped not engage in activities that do not consume extra protein and a good dose, with a high fat foods instead (causing obesity). Are the cells in the muscle (myoglobin) still work fine?

  2. I think especially in muscle cells myoglobin can not work normally, because the intake is inversely proportional to the expenditure imbalance in the chain and have the myoglobin protein that causes cells are not able to walk properly

  3. I think myoglobin will continue to work according to its function, just might not be perfect myoglobin oxygen binding and release it to the muscles of the body due to obesity.

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