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Title of Journal: Photosynth Res

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Abbravation: Photosynthesis Research

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Springer Netherlands

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DOI

10.1002/cncr.25209

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ISSN

1573-5079

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Comparison of oligomeric states and polypeptide co

Authors: Ryo Nagao Shuji Takahashi Takehiro Suzuki Naoshi Dohmae Katsuyoshi Nakazato Tatsuya Tomo
Publish Date: 2013/08/08
Volume: 117, Issue: 1-3, Pages: 281-288
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Abstract

Fucoxanthin chlorophyll a/cbinding protein FCP is a unique lightharvesting 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 twodimensional clearnative/SDSPAGE 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 diatomsThis work was supported by GrantinAids for Scientific Research from the Ministry of Education of Japan No 22370017 24370025 to TT a grant from JST PRESTO TT and a grant from the Australian Research Council’s Discovery Projects funding scheme project number DP12101360 to TT

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