New biosynthetic pathway for pink pigments from uncultured oceanic viruses

• Published in: Environmental microbiology Vol. 18; no. 12; pp. 4337 - 4347
• Main Authors: Ledermann, Benjamin, Béjà, Oded, Frankenberg-Dinkel, Nicole
• Format: Journal Article
• Language: English
• Published: England Blackwell Publishing Ltd 01.12.2016; Wiley Subscription Services, Inc
• Subjects: Algae; Bacteriophages - classification; Bacteriophages - enzymology; Bacteriophages - genetics; Bacteriophages - metabolism; Biosynthesis; Biosynthetic Pathways; Cyanobacteria; Enzymes; Oceans and Seas; Oxidoreductases - genetics; Oxidoreductases - metabolism; Phycobilins - biosynthesis; Phycoerythrin - biosynthesis; Pigments; Seawater - virology; Viral Proteins - genetics; Viral Proteins - metabolism
• ISSN: 1462-2912; 1462-2920
• DOI: 10.1111/1462-2920.13290

Summary The pink open‐chain tetrapyrrole pigment phycoerythrobilin (PEB) is employed by marine cyanobacteria, red algae and cryptophytes as a light‐harvesting chromophore in phycobiliproteins. Genes encoding biosynthesis proteins for PEB have also been discovered in cyanophages, viruses that infect cyanobacteria, and mimic host pigment biosynthesis with the exception of PebS which combines the enzymatic activities of two host enzymes. In this study, we have identified novel members of the PEB biosynthetic enzyme families, heme oxygenases and ferredoxin‐dependent bilin reductases. Encoding genes were found in metagenomic datasets and could be traced back to bacteriophage but not cyanophage origin. While the heme oxygenase exhibited standard activity, a new bilin reductase with highest homology to the teal pigment producing enzyme PcyA revealed PEB biosynthetic activity. Although PcyX possesses PebS‐like activity both enzymes share only 9% sequence identity and likely catalyze the reaction via two independent mechanisms. Our data point towards the presence of phycobilin biosynthetic genes in phages that probably infect alphaproteobacteria and, therefore, further support a role of phycobilins outside oxygenic phototrophs.