Comparison of oligomeric states and polypeptide compositions of fucoxanthin chlorophyll a/c-binding protein complexes among various diatom species

Ryo Nagao, Shuji Takahashi, Takehiro Suzuki, Naoshi Dohmae, Katsuyoshi Nakazato, Tatsuya Tomo

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

Fucoxanthin chlorophyll a/c-binding protein (FCP) is a unique light-harvesting apparatus in diatoms. Several biochemical characteristics of FCP oligomer and trimer from different diatom species have been reported previously. However, the integration of information about molecular organizations and polypeptides of FCP through a comparison among diatoms has not been published. In this study, we used two-dimensional clear-native/SDS-PAGE to compare the oligomeric states and polypeptide compositions of FCP complexes from four diatoms: Chaetoceros gracilis, Thalassiosira pseudonana, Cyclotella meneghiniana, and Phaeodactylum tricornutum. FCP oligomer was found in C. gracilis, T. pseudonana, and C. meneghiniana, but not in P. tricornutum. The oligomerization varied among the three diatoms, although a predominant subunit having similar molecular weight was recovered in each FCP oligomer. These results suggest that the predominant subunit is involved in the formation of high FCP oligomerization in each diatom. In contrast, FCP trimer was found in all the diatoms. The trimerizations were quite similar, whereas the polypeptide compositions were markedly different. On the basis of this information and that from mass spectrometric analyses, the gene products in each FCP complex were identified in T. pseudonana and P. tricornutum. Based on these results, we discuss the role of FCP oligomer and trimer from the four diatoms.

Original languageEnglish
Pages (from-to)281-288
Number of pages8
JournalPhotosynthesis research
Volume117
Issue number1-3
DOIs
Publication statusPublished - Nov 1 2013
Externally publishedYes

Keywords

  • CN-PAGE
  • FCP oligomer
  • FCP trimer
  • MS analysis

ASJC Scopus subject areas

  • Biochemistry
  • Plant Science
  • Cell Biology

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