Abstract
A library of 879 recombinant lambda phages, constructed for the genome of Desulfovibrio vulgaris Hildenborough, has been ordered by restriction fingerprinting. Restriction endonuclease HinfI digestion patterns were entered into a data base and sorted into 87 overlapping groups (contigs), with 19 clones remaining unattached. Eight of ten cloned genes of D. vulgaris, including dcrA, which encodes a transmembrane methyl-accepting protein, were assigned to contigs. Probing of a filter containing the lambda DNAs of the library with the labeled, conserved 3' end of the dcrA gene indicated hybridization to 54 clones distributed over multiple contigs. The presence of 11 additional dcr genes (dcrB to dcrL) was confirmed by direct cycled dideoxy sequencing of positive lambda clones. Since the ordered library provides only partial coverage of the D. vulgaris Hildenborough genome, we estimate that the dcr gene family has 16 members spread throughout the genome, making it the second largest gene family found in prokaryotes.
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