Characterization of a trimeric light-harvesting complex in the diatom Phaeodactylum tricornutum built of FcpA and FcpE proteins

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J. Exp. Bot.-2010.pdf
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2010
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Joshi-Deo, Jidnyasa
Schmidt, Matthias
Weisheit, Wolfram
Mittag, Maria
Büchel, Claudia
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The Journal of Experimental Botany. 2010, 61(11), pp. 3079-3087. ISSN 0022-0957. eISSN 1460-2431. Available under: doi: 10.1093/jxb/erq136
Zusammenfassung

Fucoxanthin chlorophyll proteins (Fcps), the light-harvesting antennas of heterokont algae, are encoded by a multigene family and are highly similar with respect to their molecular masses as well as to their pigmentation, making it difficult to purify single Fcps. In this study, a hexa-histidine tag was genetically added to the C-terminus of the FcpA protein of the pennate diatom Phaeodactylum tricornutum. A transgenic strain expressing the recombinant His-tagged FcpA protein in addition to the endogenous wild type Fcps was created. This strategy allowed, for the first time, the purification of a specific, stable trimeric Fcp complex. In addition, a pool of various trimeric Fcps was also purified from the wild-type cells using sucrose density gradient ultracentrifugation and gel filtration. In both the His-tagged and the wild-type Fcps, excitation energy coupling between fucoxanthin and chlorophyll a was intact and the existence of a chlorophyll a/fucoxanthin excitonic dimer was demonstrated using circular dichroism spectroscopy. Mass spectrometric analyses of the trimeric His-tagged complex indicated that it is composed of FcpA and FcpE polypeptides. It is confirmed here that a trimer is the basic organizational unit of Fcps in P. tricornutum. From circular dichroism spectra, it is proposed that the organization of the pigments on the polypeptide backbone of Fcps is a conserved feature in the case of chlorophyll a/c containing algae.

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Fachgebiet (DDC)
570 Biowissenschaften, Biologie
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Diatoms, FcpA, His-tag, thylakoid, photosynthesis
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ISO 690JOSHI-DEO, Jidnyasa, Matthias SCHMIDT, Ansgar GRUBER, Wolfram WEISHEIT, Maria MITTAG, Peter G. KROTH, Claudia BÜCHEL, 2010. Characterization of a trimeric light-harvesting complex in the diatom Phaeodactylum tricornutum built of FcpA and FcpE proteins. In: The Journal of Experimental Botany. 2010, 61(11), pp. 3079-3087. ISSN 0022-0957. eISSN 1460-2431. Available under: doi: 10.1093/jxb/erq136
BibTex
@article{JoshiDeo2010Chara-13565,
  year={2010},
  doi={10.1093/jxb/erq136},
  title={Characterization of a trimeric light-harvesting complex in the diatom Phaeodactylum tricornutum built of FcpA and FcpE proteins},
  number={11},
  volume={61},
  issn={0022-0957},
  journal={The Journal of Experimental Botany},
  pages={3079--3087},
  author={Joshi-Deo, Jidnyasa and Schmidt, Matthias and Gruber, Ansgar and Weisheit, Wolfram and Mittag, Maria and Kroth, Peter G. and Büchel, Claudia}
}
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