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
protoporphyrin [pro″to-por´fĭ-rin]
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 [pro″to-por´fĭ-rin]
a porphyrin whose iron complex united with protein occurs in hemoglobin, myoglobin, and certain respiratory pigments. It is accumulated and excreted excessively in the feces in erythropoietic protoporphyria and variegate porphyria.
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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