One copy was determined to be functionally equivalent to the well-characterized OCP of Synechocystis cyanobacteria, dubbed OCP1. But the second, OCP2, was distinct in several key aspects. The researchers hypothesize that OCP2 and another bioinformatically identified protein, OCPx, reflect intermediate stages in the evolution of photoprotection in cyanobacteria.
Bao, H., et al. “Additional Families of Orange Carotenoid Proteins in the Photoprotective System of Cyanobacteria.” Nature Plants 3, Article 17089 (2017). [DOI:10.1038/nplants.2017.89].
Instruments and Facilities: X-ray macromolecular crystallography and diffraction at Advanced Light Source at Lawrence Berkeley National Laboratory.
Funding Acknowledgements: Work supported by the National Science Foundation (NSF; IOS 1557324). Advanced Light Source supported by the Office of Basic Energy Sciences (OBES), Director, U.S. Department of Energy (DOE) Office of Science, under Contract No. DE-AC02-05CH11231.