scholarly journals N-Glycosylation of the 66-kDa Cell-Wall Glycoprotein of a Red Microalga

Glycosylation ◽  
10.5772/48313 ◽  
2012 ◽  
Author(s):  
Oshrat Levy-Ontman
Keyword(s):  
Cell Wall ◽  
Red Microalga

GLYCOPROTEIN MOIETY IN THE CELL WALL OF THE RED MICROALGA PORPHYRIDIUM SP. (RHODOPHYTA) AS THE BIORECOGNITION SITE FOR THE CRYPTHECODINIUM COHNII-LIKE DINOFLAGELLATE

1999 ◽  
Vol 35 (6) ◽  
pp. 1276-1281 ◽  
Author(s):  
Michal Ucko ◽  
Roshan Prakash Shrestha ◽  
Pnina Mesika ◽  
Dudy Bar-Zvi ◽  
Shoshana Malis Arad
Keyword(s):  
Cell Wall ◽  
Crypthecodinium Cohnii ◽  
Red Microalga

BIOSYNTHESIS OF THE CELL WALL POLYSACCHARIDE IN THE RED MICROALGA RHODELLA RETICULATA

1998 ◽  
Vol 46 (2) ◽  
pp. 147-153 ◽  
Author(s):  
Arava(Katz) Cohen ◽  
Shoshana(Malis) Arad
Keyword(s):  
Cell Wall ◽  
Cell Division ◽  
Dna Replication ◽  
Cell Wall Polysaccharide ◽  
Cell Wall Formation ◽  
Mean Cell Volume ◽  
Wall Formation ◽  
Red Microalgae ◽  
Rhodella Reticulata ◽  
Red Microalga

This research forms part of our ongoing study to elucidate cell wall biosynthesis in red microalgae. Cell wall formation during the cell cycle of the red microalga Rhodella reticulata was followed in cultures synchronized by a regime of dark (12 h), light (12 h), and dilution of the culture thereafter to 1–1.5 × 106cells/ml. Under these conditions, cell number doubled after 24 h, DNA replication occurred between the 6th and 12th hours, and cell division took place between the 8th and 14th hours of the cycle. Cell wall constituents increased only during the light hours, peaking as follows: sulfur at the 2nd hour, protein at the 11th hour, and the various sugars (each at different times) between the 6th and 12th hours of the cycle. Since xylose predominated from the beginning of the cycle, it appears that this sugar was produced first and formed the basic polymer skeleton to which other sugars were attached. Two polymers were produced during the cycle, their sizes (as determined by gel filtration) being 0.5 × 106 and 1.15 × 106 daltons. It thus seems likely that the smaller 0.5 × 106 dalton polymers are produced inside the cells and then excreted into the medium, where they are further polymerized to produce the final-size polymers. The herbicide 2,6-dichlorobenzonitrile (DCB), an inhibitor of cellulose biosynthesis, was previously found to inhibit cell wall formation in red microalgae. When it was added to the cultures at the beginning or at the end of the cycle, no inhibition in cell division was detected, but when it was added at the 8th hour, cell division was significantly inhibited (38%), resulting in an increase in mean cell volume. Addition of DCB did not affect DNA replication or cell wall polysaccharide content or composition, as measured after 24 h of the cycle. It seems that DCB affects an inhibitory phase in cell division and that this inhibition is not necessarily coupled with its inhibition of formation of the sulfated polysaccharide.

scholarly journals Predation by a dinoflagellate on a red microalga with a cell wall modified by sulfate and nitrate starvation

1994 ◽  
Vol 104 ◽  
pp. 293-298 ◽  
Author(s):  
M Ucko ◽  
S Geresh ◽  
B Simon-Berkovitch ◽  
S Arad Malis
Keyword(s):  
Cell Wall ◽  
A Cell ◽  
Nitrate Starvation ◽  
Red Microalga

Inhibition by DCB of cell wall polysaccharide formation in the red microalga Porphyridium sp. (Rhodophyta)

Phycologia ◽  
1994 ◽  
Vol 33 (3) ◽  
pp. 158-162 ◽  
Author(s):  
S. (Malis) Arad ◽  
R. Kolani ◽  
B. Simon-Berkovitch ◽  
A. Sivan
Keyword(s):  
Cell Wall ◽  
Cell Wall Polysaccharide ◽  
Red Microalga

Influence of Cell Wall Composition on the Fossilisation of Bacteria and the Implications for the Search for Early Life Forms

1997 ◽  
Vol 161 ◽  
pp. 491-504 ◽  
Author(s):  
Frances Westall
Keyword(s):  
Cell Wall ◽  
Life Forms ◽  
Cation Binding ◽  
Positive Bacterium ◽  
Gram Positive ◽  
Gram Positive Bacteria ◽  
Transmission Electron ◽  
Hydrothermal Sediments ◽  
Identification Of Bacteria ◽  
The Difference

AbstractThe oldest cell-like structures on Earth are preserved in silicified lagoonal, shallow sea or hydrothermal sediments, such as some Archean formations in Western Australia and South Africa. Previous studies concentrated on the search for organic fossils in Archean rocks. Observations of silicified bacteria (as silica minerals) are scarce for both the Precambrian and the Phanerozoic, but reports of mineral bacteria finds, in general, are increasing. The problems associated with the identification of authentic fossil bacteria and, if possible, closer identification of bacteria type can, in part, be overcome by experimental fossilisation studies. These have shown that not all bacteria fossilise in the same way and, indeed, some seem to be very resistent to fossilisation. This paper deals with a transmission electron microscope investigation of the silicification of four species of bacteria commonly found in the environment. The Gram positiveBacillus laterosporusand its spore produced a robust, durable crust upon silicification, whereas the Gram negativePseudomonas fluorescens, Ps. vesicularis, andPs. acidovoranspresented delicately preserved walls. The greater amount of peptidoglycan, containing abundant metal cation binding sites, in the cell wall of the Gram positive bacterium, probably accounts for the difference in the mode of fossilisation. The Gram positive bacteria are, therefore, probably most likely to be preserved in the terrestrial and extraterrestrial rock record.

Influence of Calcium Ions on the Plant Cell Surface: Membrane Fusions and Conformational Changes

1974 ◽  
Vol 32 ◽  
pp. 154-155
Author(s):  
D. James Morré ◽  
Charles E. Bracker ◽  
William J. VanDerWoude
Keyword(s):  
Cell Wall ◽  
Cell Surface ◽  
Conformational Changes ◽  
Calcium Ions ◽  
Surface Membrane ◽  
Carboxyl Groups ◽  
Cross Linking ◽  
Ultrastructural Evidence ◽  
Glycine Max L ◽  
Wall Extensibility

Calcium ions in the concentration range 5-100 mM inhibit auxin-induced cell elongation and wall extensibility of plant stems. Inhibition of wall extensibility requires that the tissue be living; growth inhibition cannot be explained on the basis of cross-linking of carboxyl groups of cell wall uronides by calcium ions. In this study, ultrastructural evidence was sought for an interaction of calcium ions with some component other than the wall at the cell surface of soybean (Glycine max (L.) Merr.) hypocotyls.

Sign in / Sign up

Export Citation Format

Share Document