A developmentally regulated gvpABC operon is involved in the formation of gas vesicles in the cyanobacterium Calothrix 7601 |
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Authors: | T Damerval J Houmard G Guglielmi K Csiszar N Tandeau de Marsac |
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Institution: | 1. Department of Prosthodontics, Faculty of Dental Sciences, King George''s Medical University, Lucknow, Uttar Pradesh, India;2. Department of Radiodiagnosis, King George''s Medical University, Lucknow, Uttar Pradesh, India;1. College of Mathematics and Computer Science, Gannan Normal University, Ganzhou 341000, People’s Republic of China;2. Department of Mathematics, East China Normal University, Shanghai 200241, People’s Republic of China;3. Department of Mathematics, The University of Southern Mississippi, Hattiesburg, MS 39406-5045, USA;1. CEREMADE, UMR CNRS 7534, Université Paris-Dauphine, Université PSL, Place du Maréchal De Lattre De Tassigny, Paris cedex 16, France;2. CNRS, Sorbonne Université, Laboratoire Jacques-Louis Lions, Paris, France;3. IRMA, Université de Strasbourg, CNRS UMR 7501, Strasbourg, France;4. Institut Universitaire de France (IUF), Paris cedex 05, France |
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Abstract: | In the filamentous cyanobacterium Calothrix PCC7601, gas-vesicle (GV) formation is restricted to specialized filaments, called hormogonia. The differentiation of these cells is controlled by environmental factors, such as light intensity and/or wavelength. The structural gene (gvpA) encoding a GV protein in this cyanobacterium has been previously cloned and sequenced. Two other genes, gvpB and gvpC have been found in the sequence downstream from gvpA. The gvpB gene corresponds to a second copy of gvpA, encoding an identical protein. Unlike the GV protein, the product of the gvpC gene is predominantly hydrophilic, as deduced from nucleotide sequence. Interestingly, the internal part of the gvpC gene is composed of four contiguous repeats, each containing 99 bp, forming highly homologous repeats in the deduced amino acid sequence. Another kind of periodicity has been detected inside the 99-bp repeats, suggesting that the gvpC gene might have evolved by amplification of a 33-bp-long primordial building block. The function of this gene remains to be elucidated. Finally, we have shown that the three genes, gvpA, gvpB, and gvpC, are organized in an operon that is exclusively expressed during GV formation in hormogonia. |
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