porphyrinogen

porphyrinogen
por·phy·rin·o·gen (por″fə-rinґə-jən) the reduced form of a porphyrin, containing pyrrole rings linked by methylene (CH2) instead of methylidyne bridges. The porphyrinogen forms are the functional intermediates in the biosynthesis of heme and if oxidized to their corresponding porphyrins, such as occurs in porphyrias, are irreversibly removed from the biosynthetic pathway and accumulate in tissues. Their nomenclature corresponds to that of the porphyrins.

Medical dictionary. 2011.

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  • porphyrinogen — noun A reduced form of porphyrin that is an intermediate in the biosynthesis of heme …   Wiktionary

  • porphyrinogen — …   Useful english dictionary

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  • Tetrapyrrole — Die Grundformen der cyclischen Tetrapyrrole (Pyrrol, Porphin, Porphyrin, Porphyrinogen Tetrapyrrole sind chemische Verbindungen, die in Form zyklischer Tetrapyrrole (Porphyrine) als Grundstrukturmotiv aller Chlorophylle sowie des Häms, eines… …   Deutsch Wikipedia

  • coproporphyrinogen — See porphyrinogens. c. oxidase an enzyme that catalyzes a step in porphyrin biosynthesis, reacting c. III and O2 to form protoporphyrinogen IX and 2CO2. A deficiency of this enzyme will result in hereditary …   Medical dictionary

  • porphyrin — SYN: porphin. * * * por·phy·rin pȯr fə rən n any of various compounds with a structure that consists essentially of four pyrrole rings joined by four =CH groups esp one (as chlorophyll or hemoglobin) containing a central metal atom and usu.… …   Medical dictionary

  • uroporphyrinogen — See porphyrinogens. u. decarboxylase an enzyme that participates in heme biosynthesis; it catalyzes the decarboxylation of uroporphyrin III to produce coproporphyrinogen III; it also acts on uroporphyrin I; a deficiency of this …   Medical dictionary

  • protoporphyrinogen — pro·to·por·phy·rin·o·gen (pro″to por″fə rinґə jən) a porphyrinogen (q.v.) in which two pyrrole rings each have one methyl and one propionate side chain and the other two pyrrole rings each have one methyl and one vinyl… …   Medical dictionary

  • Порфириноген — Порфириноген …   Википедия

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