Chinese Journal of Oceanology and Limnology

, Volume 27, Issue 3, pp 502–512

Characterization of a new lectin involved in the protoplast regeneration of Bryopsis hypnoides

  • Jianfeng Niu (牛建峰)
  • Guangce Wang (王广策)
  • Fang Lü (吕芳)
  • Baicheng Zhou (周百成)
  • Guang Peng (彭光)
Biology

DOI: 10.1007/s00343-009-9157-4

Cite this article as:
Niu, J., Wang, G., Lü, F. et al. Chin. J. Ocean. Limnol. (2009) 27: 502. doi:10.1007/s00343-009-9157-4

Abstract

A group of coenocytic marine algae differs from higher plants, whose totipotency depends on an intact cell (or protoplast). Instead, this alga is able to aggregate its extruded protoplasm in sea water and generate new mature individuals. It is thought that lectins play a key role in the aggregation process. We purified a lectin associated with the aggregation of cell organelles in Bryopsis hypnoides. The lectin was ca. 27 kDa with a pI between pH 5 and pH 6. The absence of carbohydrate suggested that the lectin was not a glycoprotein. The hemagglutinating activity (HA) of the lectin was not dependent on the presence of divalent cations and was inhibited by N-Acetylgalactosamine, N-Acetylglucosamine, and the glycoprotein bovine submaxillary mucin. The lectin preferentially agglutinated Gram-negative bacterium. The HA of this lectin was stable between pH 4 to pH 10. Cell organelles outside the cytoplasm were agglutinated by the addition of lectin solution (0.5 mg ml−1). Our results suggest that the regeneration of B. hypnoides is mediated by this lectin. We also demonstrated that the formation of cell organelle aggregates was inhibited by nigericin in natural seawater (pH 8.0). Given that nigericin dissipates proton gradients across the membrane, we hypothesize that the aggregation of cell organelles was proton-gradient dependent.

Keyword

Bryopsis hypnoides lectin hemagglutinating cell organelle aggregation regeneration 

Copyright information

© Chinese Society for Oceanology and Limnology, Science Press and Springer Berlin Heidelberg 2009

Authors and Affiliations

  • Jianfeng Niu (牛建峰)
    • 1
  • Guangce Wang (王广策)
    • 1
    • 2
  • Fang Lü (吕芳)
    • 1
    • 3
  • Baicheng Zhou (周百成)
    • 1
  • Guang Peng (彭光)
    • 1
  1. 1.Key Laboratory of Experimental Marine Biology, Institute of OceanologyChinese Academy of SciencesQingdaoChina
  2. 2.College of Marine Science and EngineeringTianjin University of Science and TechnologyTianjinChina
  3. 3.The Graduate School of Chinese Academy of SciencesBeijingChina

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