title: Structure of PSI, PSII and antennae complexes from yellow-green alga Xanthonema debile.
abstract: Photosynthetic carbon fixation by Chromophytes is one of the significant components of a carbon cycle on the Earth. Their photosynthetic apparatus is different in pigment composition from that of green plants and algae. In this work we report structural maps of photosystem I, photosystem II and light harvesting antenna complexes isolated from a soil chromophytic alga Xanthonema debile (class Xanthophyceae). Electron microscopy of negatively stained preparations followed by single particle analysis revealed that the overall structure of Xanthophytes' PSI and PSII complexes is similar to that known from higher plants or algae. Averaged top-view projections of Xanthophytes' light harvesting antenna complexes (XLH) showed two groups of particles. Smaller ones that correspond to a trimeric form of XLH, bigger particles resemble higher oligomeric form of XLH.
authors: Biology Centre ASCR, Branišovská 31, 370 05, České Budějovice, Czech Republic.
authors: Zdenko
authors: Z
authors: Gardian
authors: Josef
authors: J
authors: Tichý
authors: František
authors: F
authors: Vácha
mesh_terms: D002734:Chlorophyll / Q000032:analysis / Q000378:metabolism; D002851:Chromatography, High Pressure Liquid; D045342:Light-Harvesting Protein Complexes / Q000737:chemistry* / Q000648:ultrastructure; D008854:Microscopy, Electron; D010788:Photosynthesis; D045331:Photosystem I Protein Complex / Q000737:chemistry* / Q000648:ultrastructure; D045332:Photosystem II Protein Complex / Q000737:chemistry* / Q000648:ultrastructure; D055503:Protein Multimerization; D012987:Soil; D012988:Soil Microbiology; D013050:Spectrometry, Fluorescence; D058009:Stramenopiles / Q000737:chemistry* / Q000648:ultrastructure; D020524:Thylakoids / Q000737:chemistry
chemical_list: D045342:Light-Harvesting Protein Complexes; D045331:Photosystem I Protein Complex; D045332:Photosystem II Protein Complex; D012987:Soil; C088752:fucoxanthin-, chlorophyll a-c-containing protein; D002734:Chlorophyll