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A map of the chromosome of Rhodobacter capsulatus was constructed by overlapping the large restriction fragments generated by endonucleases AseI and XbaI. The analyses were done by hybridization of single fragments with the restriction fragments blotted from pulsed-field gels and by grouping cosmids of a genomic library of R. capsulatus into contigs, corresponding to the restriction fragments, and further overlapping of the contigs. A technical difficulty due to a repeated sequence made it necessary to use hybridization with cloned genes and prior knowledge of the genetic map in order to close the physical circle in a unique way. In all, 41 restriction sites were mapped on the 3.6-Mb circular genome and 22 genes were positioned at 26 loci of the map. Cosmid clones were grouped in about 80 subcontigs, forming two groups, one corresponding to the chromosome of R. capsulatus and the other corresponding to a 134-kb plasmid. cos site end labeling and partial digestion of cosmids were used to construct a high-resolution EcoRV map of the 134-kb plasmid. The same method can be extended to the entire chromosome. The cosmid clones derived in this work can be used as a hybridization panel for the physical mapping of new genes as soon as they are cloned.

Physical map of the genome of Rhodobacter capsulatus SB 1003