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  • 1
    Electronic Resource
    Electronic Resource
    Pole reversal and the development of cell asymmetry during division in cryptomonad flagellates (1993)
    Springer
    Protoplasma 174 (1993), S. 19-24 
    Details
    ISSN: 1615-6102
    Keywords: Cell division ; Cell symmetry ; Cell polarity ; Komma ; Cryptomonas ; Periplast
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary A unique form of cell division is reported for the cellsKomma caudata andCryptomonas ovata (Cryptophyceae). During cytokinesis, the posterior tail-like region of each daughter cell develops from the anterior region of the parental cell. This process, termed “pole reversal”, involves a major realignment in overall cell polarity as well as alterations to cytoplasmic and surface components. Pole reversal may be a consequence of flagellar apparatus transformation and reorientation during division, and pole reversal may facilitate the development of the asymmetric cell shape in daughter cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01404038
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  • 2
    Electronic Resource
    Electronic Resource
    The surface periplast component of the protistKomma caudata (Cryptophyceae) self-assembles from a secreted high-molecular-mass polypeptide (1997)
    Springer
    Protoplasma 200 (1997), S. 186-197 
    Details
    ISSN: 1615-6102
    Keywords: Cryptophyceae ; Periplast ; Cell wall ; Self-assembly ; Secretion
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The cell covering of the cryptomonadKomma caudata (Geitler) Hill is a trilaminar structure consisting of a surface periplast component (SPC) and an inner periplast component (IPC) that sandwich the plasma membrane. In order to investigate the development of the periplast, we have raised monoclonal antibodies against the cell surface ofK. caudata. Immunoblot analyses using one of these antibodies, K1/D.10, showed that it labeled a high-molecular-mass polypeptide. Immunofluorescence and pre- and post-embedding immunogold labeling studies demonstrated that the antibody recognized sites on the cell surface corresponding to the SPC plates and anotherK. caudata cell surface component, the rosulate scales. Labeling was also detected on surface domains devoid of periplast, namely the vestibular/gullet region of the cell. Post-embedding immunocytochemistry revealed that intracellular sites labeled with K1/D.10 included the Golgi apparatus and its associated vesicles. We propose that the subunits of theK. caudata cell covering are antigenically related molecules and that they self-assemble on the cell surface after secretion via the endomembrane system and deployment at the vestibular/gullet region or, in dividing cells, the cytokinetic furrow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283294
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  • 3
    Electronic Resource
    Electronic Resource
    Structure and development of the cryptomonad periplast: A review (1994)
    Springer
    Protoplasma 181 (1994), S. 106-122 
    Details
    ISSN: 1615-6102
    Keywords: Cryptophyceae ; Cell wall ; Periplast ; Self-assembly ; Freeze ; fracture-freeze etch
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The structure and development of the complex periplast, or cell covering, of cryptomonads is reviewed. The periplast consists of the plasma membrane (PM) plus an associated surface periplast component (SPC) and cytoplasmic or inner periplast component (IPC). The structure of the SPC and IPC, and their association with the PM, varies considerably between genera. This review, which concentrates on cryptomonads with an IPC of discrete plates, discusses relationships between periplast components and examines the development of this unique cell covering. Formation and growth of inner plates occurs throughout the cell cycle from specialized regions termed anamorphic zones. Crystalline surface plates, which comprise the SPC in many cryptomonad species, appear to form by self-assembly of disorganized subunits. InKomma caudata the subunits are composed of a high molecular weight glycoprotein that is produced within the endomembrane system and deposited onto the cell surface within anamorphic zones. The self-assembly of subunits into highly ordered surface plates appears closely associated with developmental changes in the underlying IPC and PM.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01666391
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