| Spore coat formation and timely sporulation depend on cellulose in Dictyostelium. | |
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MedLine Citation:
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PMID: 11428129 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Cellulose is a major component of the extracellular coat that surrounds the terminally-differentiated spore of Dictyostelium. It is sandwiched between two layers of proteins that derive from prespore vesicles by exocytosis. Strains unable to synthesize cellulose due to null mutations in the gene encoding the catalytic subunit of cellulose synthase (dcsA) failed to make detergent-resistant spores but produced small, highly refractile, round spore-like cells up to a day late. Although these cells resembled spores in appearance, they were unstable, only transiently ellipsoid in shape, and sensitive to hypo-osmotic shock, drying, or detergents. Differentiation of these pseudo-spores was induced in the normal time frame by activation of the cAMP-dependent protein kinase or co-development with wild type cells, and coat proteins were secreted by the dcsA-null cells at the same time as wild type cells. A substantial fraction of secreted coat proteins was loosely associated with the surface of the mutant cells, resembling the precoat posited to form early during normal sporulation. Transmission electron microscopy revealed that the precoat had little ultrastructural organization in the absence of cellulose. Thus, cellulose in the coat appears to be required for the organization of the pre-coat precursors as well as the stability, dormancy, and shape of the spore. |
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Authors:
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P Zhang; A C McGlynn; W F Loomis; R L Blanton; C M West |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, U.S. Gov't, Non-P.H.S. |
Journal Detail:
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Title: Differentiation; research in biological diversity Volume: 67 ISSN: 0301-4681 ISO Abbreviation: Differentiation Publication Date: 2001 Mar |
Date Detail:
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Created Date: 2001-06-28 Completed Date: 2001-08-16 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 0401650 Medline TA: Differentiation Country: Germany |
Other Details:
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Languages: eng Pagination: 72-9 Citation Subset: IM |
Affiliation:
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Dept. of Anatomy and Cell Biology, University of Florida College of Medicine, Box 100235, 1600 SW Archer Road, Gainesville, FL 32610-0235, USA. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Animals Blotting, Western Cell Differentiation Cellulose / biosynthesis*, genetics Dictyostelium / genetics, metabolism, physiology* Exocytosis Fluorescent Antibody Technique Microscopy, Fluorescence Mutation Protozoan Proteins / biosynthesis*, genetics, ultrastructure Spores / genetics, metabolism, physiology |
| Chemical | |
Reg. No./Substance:
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0/Protozoan Proteins; 0/spore coat proteins, Dictyostelium; 9004-34-6/Cellulose |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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