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by: Kirsten Duran
Hemoglobin
Carries oxygen from the lungs to the rest of the body
Myoglobin
It stores oxygen in muscle cells, which can be utilized as energy.
myoglobin- Has 153 amino acids
made up of four polypeptide chains-two alpha and two beta
Heterotetramer
Quaternary structure
Hemoglobin:: 141 amino acids
Monomer
Tertiary
there are made up of single polypeptide
Iron associated with the heme binds oxygen. THe same iron found in the hemoglobin which gives its red color. this provides evrey hemoglobin molecule special capability to carry four oxygen molecules with it. when blood cells absorb oxygen color of blood changes to bright red, this why arteries carry bright red color blood, and vein that carry blood cells that are deoxygenated become dark red. The more hemoglobin in the blood cells means there more capacity to carry oxygen from the lungs to different organs of the body.
Myoglobin :
serves as a local oxygen reservoir that can temporairly provide oxygen when oxygenated blood delivery is insufficient during periods of intense muscular activity. iron within the heme group must be in the Fe2+ state to bind oxygen. If iron is oxidized to the Fe 3+ state, metmyoglobin is formed .
Hemoglobin: it is a storgae protein
the quaternary structure of a hemoglobin molecule includes four tertiary structure protein chains, two of which are alpha helices and two of which are beta-pleated sheets.
myoglobin: it is a transport protein
myoglobin is a simple protein consisting of a single polypeptide. since the quaternary structure is composed of an assembly of subunits. Due to the lack of multiple subunits, it has the higest level of structure tertiary.
Hemoglobin is comparatively lower affinity to oxygen, can bind to CO2, CO and NO as well
Heme of hemoglobin protein is a prosthetic group of hetero cyclic ring of porphyritic of an iron atom; the biological function of the group is for delivering oxygen to body tissue, such that bonding of ligand of gas molecules to the iron of the protein group changes the structure of the protein by amino acid group
Myoglobin is a monomeric oxygen-binding protein containing a heme prosthetic group. Myoglobin, whose physiological role is to facilitate diffusion in muscle, has a hyperbolic oxygen binding
Admin. (2022, January 4). Difference between hemoglobin and myoglobin. BYJUS. Retrieved March 29, 2022, from https://byjus.com/biology/differentiate-between-hemoglobin-and-myoglobin/#:~:text=Hemoglobin%20and%20myoglobin%20are%20heme,found%20only%20in%20muscle%20tissues.
Answer in molecular biology for Kylie #93790. Doing your Assignments. (2019, September 4). Retrieved March 29, 2022, from https://www.assignmentexpert.com/homework-answers/biology/molecular-biology/question-93790
Vanek, T. (2021, July 22). Biochemistry, myoglobin. StatPearls [Internet]. Retrieved March 29, 2022, from https://www.ncbi.nlm.nih.gov/books/NBK544256/#:~:text=Myoglobin%20facilitates%20oxygen%20diffusion.,bioactive%20nitric%20oxide%20to%20nitrate.