title: The production, purification and crystallization of a pocilloporin pigment from a reef-forming coral.
abstract: Reef-building corals contain fluorescent pigments termed pocilloporins that function by regulating the light environment of coral and acting as a photoprotectant in excessive sunlight. These pocilloporins are related to the monomeric green fluorescent protein and the tetrameric DsRed fluorescent proteins, which have widespread use as biotechnological tools. An intensely blue-coloured pocilloporin, termed Rtms5, was expressed in Escherichia coli, purified and crystallized. Rtms5 was shown to be tetrameric, with deep blue crystals that diffract to 2.2 A resolution and belong to space group I4(1)22. The colour of this pocilloporin was observed to be sensitive to pH and a yellow (pH 3.5) and a red form (pH 4.5) of Rtms5 were also crystallized. These crystals belong to space group P4(2)22 and diffract to 2.4 A resolution or better.
authors.affiliation: Department of Biochemistry and Molecular Biology, School of Biomedical Sciences, Monash University, Clayton, Victoria 3800, Australia.
authors.forename: Travis
authors.initials: T
authors.lastname: Beddoe
authors.forename: Michael
authors.initials: M
authors.lastname: Ling
authors.forename: Sophie
authors.initials: S
authors.lastname: Dove
authors.forename: Ove
authors.initials: O
authors.lastname: Hoegh-Guldberg
authors.forename: Rodney J
authors.initials: RJ
authors.lastname: Devenish
authors.forename: Mark
authors.initials: M
authors.lastname: Prescott
authors.forename: Jamie
authors.initials: J
authors.lastname: Rossjohn
mesh_terms: D037421:Anthozoa / Q000737:chemistry*; D003460:Crystallization; D018360:Crystallography, X-Ray; D017931:DNA Primers; D018076:DNA, Complementary / Q000096:biosynthesis / Q000235:genetics; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000378:metabolism; D010860:Pigments, Biological / Q000096:biosynthesis / Q000737:chemistry* / Q000302:isolation & purification; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D017931:DNA Primers; D018076:DNA, Complementary; D010860:Pigments, Biological