Journal
FEMS MICROBIOLOGY LETTERS
Volume 271, Issue 2, Pages 251-257Publisher
OXFORD UNIV PRESS
DOI: 10.1111/j.1574-6968.2007.00715.x
Keywords
bilin; bilin reductase; linear tetrapyrrole; marine phytoplankton; Prochlorococcus; phycoerythrin
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Members of the genus Prochlorococcus belong to the most abundant phytoplankton on earth. In contrast to other cyanobacteria, Prochlorococcus is characterized by divinyl-chlorophyll containing light-harvesting complexes and the lack of phycobilisomes. Despite the lack of phycobilisomes, all sequenced genomes of Prochlorococcus possess genes that putatively encode enzymes involved in the biosynthesis of open-chain tetrapyrrole molecules. Here, biochemical evidence is presented indicating that high-light- and low-light-adapted Prochlorococcus ecotypes possess genes encoding functional enzymes for the biosynthesis of open-chain tetrapyrrole molecules. Experiments on recombinant protein as well as through complementation studies of a cyanobacterial insertion mutant revealed the functionality of the bilin reductases investigated.
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