Canadian Medical Guide > Chemicals and Drugs > Heterocyclic Compounds > Heterocyclic Compounds, 1-Ring > Pyrroles > Tetrapyrroles Terms and Definitions

Tetrapyrroles

Medical Definition:	Four PYRROLES joined by one-carbon units linking position 2 of one to position 5 of the next. The conjugated bond system results in PIGMENTATION.
Previously Indexed:	Pyrroles (1966-2003)

Tetrapyrroles Categories.

	Bile Pigments - Linear TETRAPYRROLES that give a characteristic color to BILE including: BILIRUBIN; BILIVERDIN; and bilicyanin.
	Chlorophyll - Porphyrin derivatives containing magnesium that act to convert light energy in photosynthetic organisms.
	Corrinoids - Cyclic TETRAPYRROLES based on the corrin skeleton.
	Porphyrins - A group of compounds containing the porphin structure, four pyrrole rings connected by methine bridges in a cyclic configuration to which a variety of side chains are attached. The nature of the side chain is indicated by a prefix, as uroporphyrin, hematoporphyrin, etc. The porphyrins, in combination with iron, form the heme component in biologically significant compounds such as hemoglobin and myoglobin.

Tetrapyrroles Medical Definitions and Terms

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