protoporphyrin /pro·to·por·phy·rin/ (-por´fĭ-rin) any of several porphyrin isomers, one of which is an intermediate in heme biosynthesis; it is accumulated and excreted excessively in feces in erythropoietic protoporphyria and variegate porphyria.
Protoporphyrin
protoporphyrin
pro·to·por·phy·rin (pr  t-pôr f -r n)n. A metal-free porphyrin that combines with iron to form the heme of iron-containing proteins. |
Protoporphyrin
A precursor molecule to the porphyrin molecule.
Mentioned in: Porphyrias
protoporphyrin
[prō′tōpôr′firin]
Etymology: Gk, protos + porphyros
a kind of porphyrin that combines with iron and protein to form various important organic molecules, including catalase, hemoglobin, and myoglobin. See also heme.
protoporphyrin
a porphyrin whose iron complex united with protein occurs in hemoglobin, myoglobin and certain respiratory pigments.
protoporphyrin III
combines with 4 moles of iron to form the heme moiety of hemoglobin.
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