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pUC18, pUC19

GenBank/EMBL sequence accession number L09136. See here for ordering information.

GenBank/EMBL sequence accession number L09137. See here for ordering information.

Restriction sites of the pUC18 DNA

Please note that the pUC19 nt sequence deposited under EMBL accession number X02514 is exactly the same as L09137 (GenBank/EMBL), while X02514 (GenBank) has two errors!

Additional Information:

pUC18 and pUC19 vectors are small, high copy number, E.coli plasmids, 2686 bp in length. They are identical except that they contain multiple cloning sites (MCS) arranged in opposite orientations. pUC18/19 plasmids contain: (1) the pMB1 replicon rep responsible for the replication of plasmid (source – plasmid pBR322). The high copy number of pUC plasmids is a result of the lack of the rop gene and a single point mutation in rep of pMB1; (2) bla gene, coding for beta-lactamase that confers resistance to ampicillin (source – plasmid pBR322). It differs from that of pBR322 by two point mutations; (3) region of E.coli operon lac containing CAP protein binding site, promoter Plac, lac repressor binding site and 5’-terminal part of the lacZ gene encoding the N-terminal fragment of beta-galactosidase (source – M13mp18/19). This fragment, whose synthesis can be induced by IPTG, is capable of intra-allelic (a) complementation with a defective form of beta-galactosidase encoded by host (mutation lacZDM15). In the presence of IPTG, bacteria synthesise both fragments of the enzyme and form blue colonies on media with X-gal. Insertion of DNA into the MCS located within the lacZ gene (codons 6-7 of lacZ are replaced by MCS) inactivates the N-terminal fragment of beta-galactosidase and abolishes alfa-complementation. Bacteria carrying recombinant plasmids therefore give rise to white colonies.

The map shows enzymes that cut pUC18/19 DNA once. Enzymes produced by Fermentas are shown in blue. The coordinates refer to the position of first nucleotide in each recognition sequence.

The exact position of genetic elements is shown on the map (termination codons included). The bla gene nucleotides 2486-2418 (complementary strand) code for a signal peptide. The LacZ polypeptide corresponding to wt beta-galactosidase and essential for blue/white screening ends at nt position 236 (compl. strand); another 30 codons in the same reading frame are derived from pBR322. The indicated rep region is sufficient to promote replication. DNA replication initiates at position 866 (+/- 1) and proceeds in indicated direction. Plasmids carrying the pMB1 and ColE1 replicons are incompatible, but they are fully compatible with those carrying the p15A replicon (pACYC177, pACYC184). pMB1-derived plasmids can be amplified using chloramphenicol.

npUC18_19.gif (15651 bytes)

Multiple Cloning Sites

npUC18_MCS.gif (9524 bytes)

npUC19_MCS.gif (9600 bytes)

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Updated May 15, 2000 13:36