Article (Scientific journals)
The structure at 2 A resolution of Phycocyanin from Gracilaria chilensis and the energy transfer network in a PC-PC complex.
Contreras-Martel, Carlos; Matamala, Adelio; Bruna, Carola et al.
2007In Biophysical Chemistry, 125 (2-3), p. 388-96
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Keywords :
Crystallography, X-Ray; Energy Transfer; Gracilaria/chemistry; Macromolecular Substances/chemistry; Molecular Structure; Phycocyanin/chemistry
Abstract :
[en] Phycocyanin is a phycobiliprotein involved in light harvesting and conduction of light to the reaction centers in cyanobacteria and red algae. The structure of C-phycocyanin from Gracilaria chilensis was solved by X-ray crystallography at 2.0 A resolution in space group P2(1). An interaction model between two PC heterohexamers was built, followed by molecular dynamic refinement. The best model showed an inter-hexamer rotation of 23 degrees . The coordinates of a PC heterohexamer (alphabeta)(6) and of the PC-PC complex were used to perform energy transfer calculations between chromophores pairs using the fluorescence resonance energy transfer approach (FRET). Two main intra PC ((I)beta(3)(82)-->(I)alpha(1)(84)-->(I)alpha(5)(84)-->(I)beta(6)(82) and (I)beta(3)(153)-->(I)beta(5)(153)) and two main inter PC ((I)beta(6)(82)-->(II)beta(3)(82) and (I)beta(5)(153)-->(II)beta(3)(153)) pathways were proposed based on the values of the energy transfer constants calculated for all the chromophore pairs in the hexamer and in the complex.
Disciplines :
Biochemistry, biophysics & molecular biology
Author, co-author :
Contreras-Martel, Carlos
Matamala, Adelio
Bruna, Carola
Poo-Caamano, German
Almonacid, Daniel
Figueroa, Maximiliano ;  Université de Liège - ULiège > Département des sciences de la vie > GIGA-R : Biologie et génétique moléculaire
Martinez-Oyanedel, Jose
Bunster, Marta
Language :
English
Title :
The structure at 2 A resolution of Phycocyanin from Gracilaria chilensis and the energy transfer network in a PC-PC complex.
Publication date :
2007
Journal title :
Biophysical Chemistry
ISSN :
0301-4622
Publisher :
Elsevier Science, Amsterdam, Netherlands
Volume :
125
Issue :
2-3
Pages :
388-96
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 07 February 2012

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