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Male gametic nucleus-specific H2B and H3 histones, designated gH2B and gH3, in Lilium longiflorum

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Abstract

Two proteins that resemble core histones and might be specific to the male gametic (generative) nucleus within the pollen of Lilium longiflorum Thumb, (originally designated p22.5 and p18.5; K. Ueda and I. Tanaka, 1994, Planta, 192, 446–452) were characterized biochemically and immunochemically. Patterns of digestion of p22.5 and p18.5 by Staphylococcus aureus V8 protease closely resembled those of somatic histones H2B and H3, respectively. However, peptide fragments that were unique to p22.5 or p18.5 were also detected. Antibodies raised against these proteins did not cross-react with any somatic histones. These results indicate that p22.5 and p18.5 are different from somatic histones in terms of primary structure. Analysis of their amino-acid compositions revealed that p22.5 is a moderately lysine-rich protein while p18.5 is an arginine-rich protein. From these results, we conclude that p22.5 is a variant of histone H2B and p18.5 is a variant of histone H3. Immunofluorescence staining of pollen grains using the specific antibodies revealed that both p22.5 and p18.5 are only present in the generative cell nucleus and are not to be found in the vegetative cell nucleus. This study demonstrates that (i) specific histone variants are present in the male gametic nucleus of a higher plant, as they are in the sperm nucleus of animals, and (ii) distinct differences in histone composition exist between the nuclei of generative and vegetative cells in pollen. These novel histones (p22.5 and p18.5), specific to male gametic nuclei, have been designated gH2B and gH3, respectively.

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Abbreviations

DAPI:

4′6-diamidino-2-phenylindole

FITC:

fluorescein isothiocyanate

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Authors and Affiliations

  1. Department of Biology, Yokohama City University, Seto 22-2, Kanazawa-ku, Yokohama 236, Japan

    Kenji Ueda & Ichiro Tanaka

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  1. Kenji Ueda
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  2. Ichiro Tanaka
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The authors thank Dr. Y. Sado (Shigei Medical Institute, Japan) for his helpful advice on immunization and Prof. T. Iguchi and Prof. K. Manabe (Yokohama City University, Japan) for providing facilities for experiments. This work was supported in part by a Grant-in-Aid for Scientific Research from the Ministry of Education, Science and Culture, Japan.

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Ueda, K., Tanaka, I. Male gametic nucleus-specific H2B and H3 histones, designated gH2B and gH3, in Lilium longiflorum . Planta 197, 289–295 (1995). https://doi.org/10.1007/BF00202649

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  • DOI: https://doi.org/10.1007/BF00202649

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