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  • 1
    Electronic Resource
    Electronic Resource
    Further evidence from sectioned material in support of the existence of a linear terminal complex in cellulose synthesis (1987)
    Springer
    Protoplasma 136 (1987), S. 96-103 
    Details
    ISSN: 1615-6102
    Keywords: Boergesenia forbesii ; Microfibrils ; Microtubules ; Plasma membrane ; Sectioned material ; Terminal complexes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Transmembrane linear terminal complexes considered to be involved in the synthesis of cellulose microfibrils have been described in the plasma membrane ofBoergesenia forbesii. Evidence for the existence of these structures has been obtained almost exlusively using the freeze etching technique. In the present study an attempt has been made to complete these studies using conventional fixation, staining, and sectioning procedures. In developing cells ofBoergesenia forbesii, strongly stained structures traversing the plasma membrane and averaging 598.9 nm ± 171.3 nm in length, 28.7 nm ± 4.2 nm in width, and 35.2 nm ± 6.6 nm in depth have been demonstrated. These structures are considered to be linear terminal complexes. At their distal (cell wall) surface, they appear to be closely associated with cellulose microfibrils. At the proximal (cytoplasmic) surface, they are associated with microtubules and polysomes. A model of the possible interrelation of the terminal complexes and microtubules leading to the generation of cell wall microfibrils is proposed.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276358
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  • 2
    Electronic Resource
    Electronic Resource
    Modification of protoplast cell wall regeneration by membrane perturbation (1988)
    Springer
    Protoplasma 143 (1988), S. 38-42 
    Details
    ISSN: 1615-6102
    Keywords: Cellulose biosynthesis ; Terminal complexes ; Freeze-frac-ture ; Boergesenia forbesii ; Membranes
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Protoplasts derived from cells ofBoergesenia forbesii regenerated aberrant cell walls when treated with cholesteryl hemisuccinate (CHS). Protoplasts treated with CHS, for a short period during the initial stages of cell wall regeneration, developed a patchwork cell wall, possessing regions devoid of cell wall. This effect was reversible, and treated cells ultimately developed a normal, confluent cell wall when removed from the CHS. Freeze fracture studies revealed that for CHS-treated cells, regions without microfibril impressions did possess intramembranous particles (IMP's) but that these regions contained small domains free of IMP's suggestive of lateral phase separation. The data implies that the physical characteristics of the plasma membrane lipid are important to the deposition of cell wall microfibrils during cell wall regeneration. This effect may be attributed to altered lipid-protein interactions, modified membrane fusion characteristics, or altered membrane flow.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01282957
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  • 3
    Electronic Resource
    Electronic Resource
    Development of cellulose synthesizing complexes inBoergesenia andValonia (1988)
    Springer
    Protoplasma 144 (1988), S. 160-169 
    Details
    ISSN: 1615-6102
    Keywords: Boergesenia forbesii ; Valonia ventricosa ; Freeze fracturing ; Cellulose synthesizing complexes ; Microfibrils
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The development of linear cellulose synthesizing complexes (=TCs) of two selected siphonocladalean algae,Boergesenia forbesii andValonia ventricosa was investigated by following the time course of the regeneration of cell walls with the freeze fracture technique after aplanospore induction. The following structural changes of TC development were examined: (1) TCs initiatede novo; (2) the first nucleation of TC subunits occurs within 2 hr inBoergesenia and 5 hr inValonia after aplanospore induction, immediately followed by the assembly of cellulose microfibrils; (3) TCs increase their length during the assembly of randomly oriented microfibrils; and, (4) TCs stop increasing in length after the assembly of ordered microfibrils begins, with some time lag. The data demonstrate that linear TCs are not artificial products but dynamic entities which are involved in the assembly of cellulose microfibrils.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01637249
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