File:709 2017 1147 Fig3b.jpg
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Description709 2017 1147 Fig3b.jpg |
English: Membrane structre of an algal chromista cell (cryptophyceae). These originated by secondary intracellular enslavement of a red algal plant cell. Both target nuclear-coded proteins to plastids by transit peptides (TPs) recognised by outer membrane (OM, blue) Toc receptors and to mitochondria (enslaved α-proteobacteria) by topogenic sequences recognised by OM Tom receptors. For clarity, Golgi, peroxisomes and lysosomes omitted. Cryptophytes retain the enslaved red algal nucleus (simplified to a tiny nucleomorph), starch, and cytosolic ribosomes within the periplastid space (PS), and phycobilins (shown in red but can be blue instead) in the thylakoid lumen; all other euchromists (haptophytes, Ochrophytina, not shown) lost these four components and stack their thylakoids in threes not pairs, but like cryptophytes retained the red algal plasma membrane as the periplastid membrane (PPM) and a periplastid reticulum (PR) here argued to be the relict trans-Golgi network (TGN) of the enslaved red alga and topologically distinct from the PPM. |
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Source | Fig. 3b at https://link.springer.com/article/10.1007/s00709-017-1147-3 Kingdom Chromista and its eight phyla: a new synthesis emphasising periplastid protein targeting, cytoskeletal and periplastid evolution, and ancient divergences. In: Protoplasma 255,pages 297–357, doi:10.1007/s00709-017-1147-3 | |||
Author | Thomas Cavalier-Smith (caption slightly moved, digitylly enhanced) | |||
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current | 14:33, 8 August 2022 | 722 × 618 (65 KB) | Ernsts (talk | contribs) | Uploaded a work by Thomas Cavalier-Smith from Fig. 3+6 at https://link.springer.com/article/10.1007/s00709-017-1147-3 Kingdom Chromista and its eight phyla: a new synthesis emphasising periplastid protein targeting, cytoskeletal and periplastid evolution, and ancient divergences. In: Protoplasma 255, doi:10.1007/s00709-017-1147-3 with UploadWizard |
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5 September 2017
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