Glyoxysome

Glyoxysome

Glyoxysomes are specialized peroxisomes found in plants (particularly in the fat storage tissues of germinating seeds) and also in filamentous fungi. As in all peroxisomes, in glyoxysomes the fatty acids are hydrolyzed to acetyl-CoA by peroxisomal β-odixation enzymes. Besides peroxisomal functions, glyoxysomes possess additionally the key enzymes of glyoxylate cycle (isocitrate lyase and malate synthase) which accomplish the glyoxylate cycle bypass.

Thus, glyoxysomes (as all peroxisomes) contain enzymes that initiate the breakdown of fatty acids and additionally possess the enzymes to produce intermediate products for the synthesis of sugars by gluconeogenesis. The seedling uses these sugars synthesized from fats until it is mature enough to produce them by photosynthesis.

References

Sengbusch, Peter V. (2003) "Botany online: Peroxysomes and Glyoxysomes" [http://www.biologie.uni-hamburg.de/b-online/e23/23c.htm]

UniProt Knowledgebase keyword: Glyoxysome [http://www.expasy.org/cgi-bin/get-entries?KW=Glyoxysome]

External links

*


Wikimedia Foundation. 2010.

Игры ⚽ Нужна курсовая?

Look at other dictionaries:

  • GLYOXYSOME — Pendant la germination des graines oléagineuses (ricin, tournesol), les réserves lipidiques de l’albumen ou des cotylédons des semences disparaissent. Ces lipides sont convertis en glucides, principalement du saccharose: ainsi un flux de carbone… …   Encyclopédie Universelle

  • Glyoxysome — Dans beaucoup de graines, le glyoxysome est un type de peroxysome dans lequel se déroule le cycle du glyoxylate permettant la transformation des lipides stockés dans cette graine en saccharose pour alimenter l embryon lors de la germination.… …   Wikipédia en Français

  • glyoxysome — noun Any of various specialized peroxisomes found in plants (particularly in the fat storage tissues of germinating seeds) and also in filamentous fungi, serving to break down fatty acids and provide enzymes to produce intermediates for the… …   Wiktionary

  • glyoxysome — gly·ox·y·some (gli okґsĭ sōm) any of the microbodies present in certain plants and microorganisms, resembling the peroxisomes of vertebrate animal cells, but having, in addition to catalase and oxidase enzymes, the enzymes of the… …   Medical dictionary

  • Organelle — A typical animal cell. Within the cytoplasm, the major organelles and cellular structures include: (1) nucleolus (2) nucleus (3) ribosome (4) vesicle (5) rough endoplasmic reticulum (6) Golgi apparatus …   Wikipedia

  • Cell (biology) — Allium cells in different phases of the cell cycle …   Wikipedia

  • Cytoplasm — Schematic showing the cytoplasm, with major components of a typical animal cell (organelles): (3) ribosomes (indicated by purple dots) (4) vesicle (5) rough endoplasmic reticulum (ER) (6) Golgi apparatus (7) cytoskeleton (8) smooth ER (9)… …   Wikipedia

  • Cell nucleus — HeLa cells stained for the cell nucleus DNA with the Blue Hoechst dye. The central and rightmost cell are in interphase, thus their entire nuclei are labeled. On the left, a cell is going through mitosis and its DNA has condensed ready for… …   Wikipedia

  • Chloroplast — Simplified structure of a chloroplast Chloroplasts (English pronunciation: /ˈklɒrəplæsts/) are organelles found in plant cells and other eukaryotic organisms that conduct photosynthesis. Chloroplasts capture light energy to conserve …   Wikipedia

  • Cell membrane — Illustration of a Eukaryotic cell membrane The cell membrane or plasma membrane is a biological mem …   Wikipedia

Share the article and excerpts

Direct link
… Do a right-click on the link above
and select “Copy Link”