Nucleic Acids Research, 1989, Vol. 17, No. 13 5057-5070
© 1989
MOLECULAR BIOLOGY |
Cosmid-derived map of E.coli strain BHB2600 in comparison to the map of strain W3110
Institut fur Genetik der UniversitüT zu K
ln Weyertal 121, D-5000 K81n 41, FRG
Received April 7, 1989. Revised June 12, 1989. Accepted June 12, 1989.
A physical map for the genome of E. coli K12 strain BHB2600 was constructed by use of 570 cloned DNA elements (CDEs) withdrawn from a cosmid library. Dot blot hybridisation was applied to establish contig interrelations with subsequent fine mapping achieved by analysis of EcoRl restriction patterns on Southern blots. The derived map covers nearly 95% of the E.coli genome resulting in 12 minor gaps. It may be compared to the almost complete map for strain W3110 of Kohara et al. (1). Except for one tiny gap (lpp,36.5') remaining gaps in BHB26OO do not coincide with those in W3110 so that both maps complement each other establishing an essentially complete clone represented map. Besides numerous minute differences (site and fragment gains and losses) bom strains harbour at differing positions extended rearrangements flanked by mutually inverted repetitive elements, in our case insertion elements (IS1 and IS5).
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