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Physical and genetic maps of the genome of the heterocyst-forming cyanobacterium Anabaena sp. strain PCC 7120.

MSU-DOE Plant Research Laboratory, Michigan State University, East Lansing 48824-1312.

ABSTRACT

A restriction map of the chromosome of the cyanobacterium Anabaena sp. strain PCC 7120 was generated by the determination of the order of restriction fragments of the infrequently cleaving restriction endonucleases AvrII, SalI, and PstI. These restriction fragments were resolved by the pulsed homogeneous orthogonal field gel electrophoresis system of pulsed-field gel electrophoresis (I. Bancroft and C. P. Wolk, Nucleic Acids Res. 16:7405-7418, 1988). Other infrequently cutting restriction endonucleases (AhaII, Asp718, AsuII, BanII, BglII, BssHII, FspI, NcoI, NruI, SphI, SplI, SstII, and StuI) were identified that could prove useful for higher-resolution mapping. The chromosome was found to be 6.4 megabases in size and circular. Three apparently circular large plasmids (410, 190, and 110 kilobases) were also identified. A genetic map was constructed by hybridization with gene-specific probes. Genes encoding components of the photosynthetic electron transport chain were not within a single tight cluster.

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