title: Characterization of green mutants in Fremyella diplosiphon provides insight into the impact of phycoerythrin deficiency and linker function on complementary chromatic adaptation.
abstract: Functions of phycobiliprotein (PBP) linkers are less well studied than other PBP polypeptides that are structural components or required for the synthesis of the light-harvesting phycobilisome (PBS) complexes. Linkers serve both structural and functional roles in PBSs. Here, we report the isolation of a phycoerythrin (PE) rod-linker mutant and a novel PE-deficient mutant in Fremyella diplosiphon. We describe their phenotypic characterization, including light-dependent photosynthetic pigment accumulation and photoregulation of cellular morphology. PE-linker protein CpeE and a novel protein impact PE accumulation, and thus PBS function, primarily under green light conditions.
authors.affiliation: Department of Energy, Plant Research Laboratory, Michigan State University, East Lansing, MI 48824, USA.
authors.forename: Melissa J
authors.initials: MJ
authors.lastname: Whitaker
authors.forename: Bagmi
authors.initials: B
authors.lastname: Pattanaik
authors.forename: Beronda L
authors.initials: BL
authors.lastname: Montgomery
mesh_terms: D000222:Adaptation, Physiological / Q000235:genetics*; D000458:Cyanobacteria / Q000166:cytology* / Q000235:genetics / Q000502:physiology*; D009154:Mutation; D045524:Phycobilisomes / Q000235:genetics / Q000502:physiology*; D010799:Phycoerythrin / Q000235:genetics*
chemical_list: D045524:Phycobilisomes; D010799:Phycoerythrin