tetrapyrrole

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tet·ra·pyr·role

(tet'ră-pir'ōl),
A molecule containing four pyrrole nuclei; for example, porphyrin.
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Interaction of FLU, a negative regulator of tetrapyrrole biosynthesis, with the glutamyl-tRNA reductase requires the tetratricopeptide repeat domain of FLU.
Addition of 600 [micro]L acetone/HCl (39:1 (v/v)) to 200 [micro]L of the supernatant and vortexing for 10 minutes was used to extract the tetrapyrroles and precipitate the proteins.
High Performance Liquid Chromatography of Tetrapyrroles. Tetrapyrrole extracts were analyzed using a JASCO HPLC 2000 series system (Jasco, Gross-Umstadt, Germany).
This loosely defined group of molecular species can include sugars, lignin, peptides and proteins, antibiotics (i.e., lactams and tetracyclins), carbohydrates (and cyclitols), lipids, nucleic acids and component units, terpenoids including retinoids and steroids, tetrapyrroles and related compounds.
By means of solvent extraction: Chlorophylls: The chlorophylls belong to the family of tetrapyrroles that include the open chain bile pigments and the large ring compounds of porphyrins.
In present day biochemistry, transition metals are perhaps best known as cofactors with tetrapyrroles or porphyrins (Begley, 2006).
Other porphyrins (tetrapyrroles), such as cytochromes, which are structurally related to chlorophyll, participate in redox reactions in many living systems.
[Delta]-aminolevulinate dehydratase (ALAD) is a phylogenetically conserved metalloprotein that catalyses the second step in the synthesis of porphobilinogen, the universal precursor of tetrapyrroles found in hemes and chlorophylls (4, 5).
All living organisms require tetrapyrroles, usually as heme, chlorophyll, or both.
No metal ions were found associated with pocilloporin, thus eliminating it from the group of metal-bearing biochromes such as the colored copper proteins and metal-chelated tetrapyrroles (Fox, 1979).