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Heme ( American English ), or haem ( Commonwealth English, both pronounced / hi:m / HEEM ), is a ring-shaped iron-containing molecular component of hemoglobin, which is necessary to bind oxygen in the bloodstream. It is composed of four pyrrole rings with 2 vinyl and 2 propionic acid side chains. [1]
15 de mar. de 2018 · A heme is an organic, ring-shaped molecule. Due to its special structure, a heme is capable of holding, or “hosting” an iron molecule. A heme is made from 4 pyrroles, which are small pentagon-shaped molecules made from 4 carbons and 1 nitrogen. Four pyrroles together form a tetrapyrrole.
La hemoglobina es una hemoproteína de la sangre de masa molecular de 64 000 g/mol (64 k Da) y de color rojo característico. Transporta oxígeno gaseoso, desde los órganos respiratorios hasta los tejidos y dióxido de carbono en un 20-30 % desde los tejidos hasta los pulmones que lo eliminan.
1 de may. de 2023 · Heme is an essential prosthetic group in proteins that is necessary as a subcellular compartment to perform diverse biological functions like hemoglobin and myoglobin. [1] . Other enzymes which use heme as a prosthetic group includes cytochromes of the electron transport chain, catalase, and nitric oxide synthase.
