Unknown PEB lyase or lyase-isomerase


In marine PE-containing Synechococcus strains, PEB are found at Cys-139 of alpha-PEI and PUB at Cys-140 and Cys-75 of alpha-PEII (Ong & Glazer 1991), as well as on PEII-associated linker polypeptides (Wilbanks & Glazer 1993b; Six et al. 2005), with no obvious candidate lyase-isomerase identified for these functions so far (Grébert et al. 2022). So these sites, which interestingly are absent from the PE-III of most Prochlorococcus strains, might either be auto-catalytically chromophorylated or the chromophore linkage catalyzed by a yet-to-be characterized lyase or lyase-isomerase.


  • Grébert et al., 2022. Diversity and evolution of pigment types in marine Synechococcus cyanobacteria Genome Biol Evol, 14, evac035.
  • Ong et al., 1991. Phycoerythrins of marine unicellular cyanobacteria. I. Bilin types and locations and energy transfer pathways in Synechococcus spp. phycoerythrins J Biol Chem, 266, 9515-9527.
  • Six et al., 2005. Two novel phycoerythrin-associated linker proteins in the marine cyanobacterium Synechococcus sp. strain WH8102 J Bacteriol, 187, 1685-1694.
  • Wilbanks et al., 1993. Rod structure of a phycoerythrin II-containing phycobilisome. I. Organization and sequence of the gene cluster encoding the major phycobiliprotein rod components in the genome of marine Synechococcus sp. WH8020 J Biol Chem, 268, 1226-1235.

Gene Locus tag Genbank Species Strain PBP in rods Pigment type Remark Length Last change

Model strain Model strains, Marine strains

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