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Occurrence of the 32-kDa QB-binding protein of photosystem II in vegetative cells, dheterocysts and akinetes of Azolla carotiniana cyanobionts

Planta volume 180, pages 361–371 (1990)Cite this article

Abstract

Transmission electron microscopy and immunocytological labeling were used to localize the 32-kilodalton (kDa) protein (DI polypeptide) of photosystem II in different cell types of the cyanobionts within leaf cavities of Azolla caroliniana Willd. The 32-kDa protein binds the secondary electron acceptor QB, and is highly conserved between plants and cyanobacteria. Three antisera, specific for different epitopes of the 32-kDa protein, were used as primary antibodies. Immunologically recognizable 32-kDa protein was localized on membranes of Azolla chloroplasts, vegetative cyanobacterial cells, akinetes, and heterocysts that were at all stages of the differentiation process. The 32-kDa protein was not detected in nonphotosynthetic endosymbiotic bacteria found within leaf cavities. The amount of the 32-kDa protein observed in different cyanobacterial cell types was dependent upon the primary antiserum used and membrane orientation within a cell with respect to the plane of sectioning. Therefore, although 32-kDa protein was present in all three cyanobacterial cell types and clear trends in labeling patterns could be elucidated, it was not possible to quantitate the amounts of protein with respect to either cell type or leaf-cavity age.

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Abbreviations

Ab:

antibody

kDa:

kilodalton(s)

PSII:

photosystem II

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Affiliations

  1. Plant Research Group, Department of Biology, MRC 306, Rensselaer Polytechnic Institute, 12180-3590, Troy, NY, USA

    Ellen B. Braun-Howland & Sandra A. Nierzwicki-Bauer

Authors
  1. Ellen B. Braun-Howland
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  2. Sandra A. Nierzwicki-Bauer
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Additional information

This work was supported by Grant No. 1 RO1 GM37051-01 awarded by the National Institute of General Medical Sciences to S.A.N.-B. We are grateful to Drs. Harry Roy and Michael Hanna for helpful discussions during the course of this work. The contributions of Mrs. Mary Ann Sessions to the final draft of the manuscript are also gratefully acknowledged. Special thanks are due to Drs. J. Oelze, L. McIntosh and R. Sayre for providing the antisera used in these studies.

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Braun-Howland, E.B., Nierzwicki-Bauer, S.A. Occurrence of the 32-kDa QB-binding protein of photosystem II in vegetative cells, dheterocysts and akinetes of Azolla carotiniana cyanobionts. Planta 180, 361–371 (1990). https://doi.org/10.1007/BF00198787

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  • DOI: https://doi.org/10.1007/BF00198787

Key words

  • Anabaena
  • Azolla
  • Cyanobacteria
  • Heterocyst
  • Protein, 32-kDa
  • Symbiosis (Azolla-Anabaena)