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phycocyanobilin biosynthesis

Phytobilins are linear tetrapyrrole molecules that are synthesized by plants, algae and cyanobacteria. Major classes of phytobilins are: 1. phycobilins, which are precursors of the chromophores of phycobiliproteins and some algal phytochromes 2. phytochromobilins, which are precursors of the chromophores of higher plant phytochromes . Phycobiliproteins are light-harvesting accessory pigments of cyanobacteria, red algae and cryptophytes, and phytochromes are photoreversible light signal-transducing pigments of plants, some algae, and some cyanobacteria. One of the major phycobiliproteins in cyanobacteria is phycocyanins, and its chromophore is called phycocyanobilin. There are two stereoisomers of phycocyanobilin, but apparently only : 3Z-PHYCOCYANOBILIN is produced initially, with the second isomer potentially produced by a distinct bilin isomerase . : 3Z-PHYCOCYANOBILIN is biosynthesized from heme in a pathway that begins with the opening of the tetrapyrrole macrocycle of protoheme to form : BILIVERDINE, in a reaction catalyzed by : MONOMER-13860 . In at least some cyanobacteria, such as : TAX-1148, : BILIVERDINE is converted to : 3Z-PHYCOCYANOBILIN by a single enzyme, : MONOMER-13954, encoded by the : G-10655 gene . A similar conversion is apparently catalyzed by multiple enzyme in the red algae :TAX-2771 .

from BIOCYC source record: SYNEL_PWY-5917
Type: pathway
Taxonomic scope
organism-specific biosystem
Synechococcus elongatus

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