tetrapyrrole


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tetrapyrrole

(ˌtɛtrəˈpɪrəʊl)
n
(Chemistry) a chemical formed from four pyrrole rings
References in periodicals archive ?
Interaction of FLU, a negative regulator of tetrapyrrole biosynthesis, with the glutamyl-tRNA reductase requires the tetratricopeptide repeat domain of FLU.
1) Assembly of 4 pyrrole rings forms the tetrapyrrole ring protoporphyrin, a precursor of several organic molecules.
Geoporphyrins are molecules that have characteristic tetrapyrrole macrocyclic structures substituted with various alkyl chains.
2+]) at the center of the tetrapyrrole core (protoporphyrin IX), forming the heme nucleus.
To achieve these objectives, we will characterise and use two types of tetrapyrrole macrocycles: porphycenes and porphyrazines as red/NIR emissive molecular rotors and PDT sensitizers and we will measure viscosity based on their fluorescence lifetime.
Evaluation of in vivo biological activities of tetrapyrrole ethanolamides as novel anticancer agents.
A porphyrin molecule consists of heterocyclic tetrapyrrole unit, called porphine, and meso-substituents.
In any case we must break the porphyrin-related tetrapyrrole ring systems that chelate and capture the industrially important metals.
The aromaticity of the linear tetrapyrrole bilirubin structure confers broad absorptivity in the ultraviolet and visible spectra, but this product of heme metabolism also is a highly reactive chemical species, a property that may contribute to its toxicity in biological systems.
Specific topics include conducting polymer nanocomposite membranes, the role of tetrapyrrole pigment-oriented thin films in the detection of volatile organic compounds, electronic noses and tongues, and applications of sensors in food and environmental analysis.
NO has been reported to inhibit methionine synthase activity in vitro [6-8], it might be expected to bind to the cobalt in cobalamin because (i) NO binds tightly to the iron in heme; (ii) ferrous heme and cbl (III) are isoelectronic; and (iii) in both heme and cobalamin, the metal ion is coordinated to four in-plane nitrogen atoms of a tetrapyrrole ring and has two out-of-plane ligands [2].