NDLI: Directed mutagenesis of an iron-sulfur protein of the photosystem I complex in the filamentous cyanobacterium Anabaena variabilis ATCC 29413.

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Directed mutagenesis of an iron-sulfur protein of the photosystem I complex in the filamentous cyanobacterium Anabaena variabilis ATCC 29413.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mannan, R. M. Pakrasi, H. B. Whitmarsh, J. Nyman, P.
Description	Author Affiliation: Mannan RM ( Department of Biology, Washington University, St. Louis, MO 63130.);
Abstract	In oxygenic photosynthetic organisms the PSI-C polypeptide, encoded by the psaC gene, provides the ligands for two [4Fe-4S] centers, FA and FB, the terminal electron acceptors in the photosystem I (PSI) complex. An insertion mutation introduced in the psaC locus of the filamentous cyanobacterium Anabaena variabilis ATCC 29413 resulted in the creation of a mutant strain, T398-1, that lacks the PSI-C polypeptide. In medium supplemented with 5 mM fructose, the mutant cells grew well in the dark. However, when grown in the same medium under light, the doubling rate of T398-1 cells was significantly decreased. In intact cells of T398-1, bicarbonate-dependent whole-chain electron transport (PSII and PSI) could not be detected, although partial electron transport reactions involving either one of the two photosystems could be measured at significant rates. The low-temperature EPR signals attributed to the [4Fe-4S] centers FA and FB were absent in the mutant cells. Chemical titration measurements indicated that the ratios of chlorophyll to the primary donor P700 were virtually identical in membranes from the wild-type and mutant cells. Moreover, room-temperature optical spectroscopic analysis of the thylakoid membranes isolated from T398-1 showed flash-induced P700 oxidation followed by dark rereduction, indicating primary photochemistry in PSI. Thus stable assembly of the reaction center of PSI can occur in the absence of the Fe-S cluster cofactors FA and FB. These studies demonstrate that Anabaena 29413 offers a useful genetic system for targeted mutagenesis of the PSI complex.
ISSN	00278424
e-ISSN	10916490
Journal	Proceedings of the National Academy of Sciences of the United States of America
Issue Number	22
Volume Number	88
Language	English
Publisher	National Academy of Sciences
Publisher Date	1991-12-01
Publisher Place	United States
Access Restriction	Open
Subject Keyword	Anabaena Genetics Iron-Sulfur Proteins Mutagenesis, Site-Directed Photosynthetic Reaction Center Complex Proteins Growth & Development Metabolism Blotting, Southern Cloning, Molecular Conjugation, Genetic DNA Isolation & Purification Electron Spin Resonance Spectroscopy Electron Transport Escherichia Coli Kinetics Light-Harvesting Protein Complexes Photosynthesis Photosystem I Protein Complex Plasmids Restriction Mapping Spectrophotometry Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Research Support, U.S. Gov't, P.H.S. Multidisciplinary
Content Type	Text
Resource Type	Article
Subject	Multidisciplinary

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