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372 results on '"Houmard, J A"'

27. Cyanobacterial two component proteins: structure, diversity, distribution and evolution

Author

Mk, Ashby, Houmard, J., Duponchelle, Martine, Régulation de l'expression génétique (REG), Département de Biologie - ENS Paris, École normale supérieure - Paris (ENS Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-École normale supérieure - Paris (ENS Paris), and Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Institut National de la Santé et de la Recherche Médicale (INSERM)-Centre National de la Recherche Scientifique (CNRS)-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV.BBM] Life Sciences [q-bio]/Biochemistry, Molecular Biology, [SDV.BBM]Life Sciences [q-bio]/Biochemistry, Molecular Biology
Published
2006

38. An in vivo approach to define the role of the LCM, the key polypeptide of cyanobacterial phycobilisomes

Author

Veronique Capuano, Jc, Thomas, Tandeau de Marsac N, and Houmard J

Subjects
DNA, Bacterial, Blotting, Southern, Microscopy, Electron, RNA, Bacterial, Bacterial Proteins, Genes, Bacterial, Macromolecular Substances, Restriction Mapping, Light-Harvesting Protein Complexes, Phycobilisomes, Cyanobacteria, Plant Proteins, Plasmids
Abstract

In cyanobacteria, phycobilisomes are regularly arrayed on the surface of the photosynthetic membranes, and their role is to funnel light energy to the underlying photosystem II reaction center. A model has recently been proposed that ascribes to the so-called LCM, a central role in the building up of the phycobilisome, in addition to its role of terminal energy acceptor (Capuano, V., Braux, A.-S., Tandeau de Marsac, N., and Houmard, J. (1991) J. Biol. Chem. 266, 7239-7247). The phycobilisomes of Calothrix sp. PCC 7601 are typically of the type found in most cyanobacteria. Those of Synechococcus PCC 7942 (or PCC 6301) differ in having central cores made up of two instead of three cylinders. We have integrated the Calothrix PCC 7601 apcE gene that encodes the LCM into the chromosome of a Synechococcus PCC 7942 strain. We have observed that the heterologous gene is expressed and that the corresponding product carries a bilin-type chromophore and can be detected in the phycobilisome fraction of the Synechococcus strain. Moreover, it is shown that, in agreement with our model, this LCM can direct the formation of phycobilisomes that have three-cylinder cores.

Published
1993

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