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versión On-line ISSN 0717-3458
Electron. J. Biotechnol. v.12 n.2 Valparaíso abr. 2009
Genetic and physical map of broad host range cosmid pRG930cm
Financial support: AC was initially supported by a joint grant of the laboratories involved and currently holds an IRO scholarship from KU Leuven. RL holds a postdoctoral fellowship from the FWO (Fonds voor Wetenschappelijk Onderzoek), Vlaanderen.
Keywords: cosmid, pRG930cm, Pseudomonas, sequencing.
Present address: #Division of Gene Technology, Katholieke Universiteit Leuven, Kasteelpark Arenberg 21, Leuven, B-3001, Belgium.
We hereby present the complete sequence and annotation of pRG930cm, a spectinomycin/streptomycin/chloramphenicol-resistant cosmid vector. pRG930cm (17,256 bp; GenBank Accession No.: FM174471) has a broad host range, and is stably maintained by a number of Gram-negative bacteria including Pseudomonas spp, Escherichia coli, Agrobacterium tumefaciens and Azorhizobium caulinodans ORS571. pRG930cm is already widely used and its sequence will aid efficient construction and analysis of cosmid libraries.
Incompatibility group P alpha (IncPα) low-copy-number plasmids have a wide host range and replicate/maintain themselves stably in most Gram-negative bacteria (Pansegrau et al. 1994). pVS1 plasmid, an IncP plasmid isolated from Pseudomonas aeruginosa replicates in a wide range of Gram-negative bacteria but not in E. coli (Itoh et al. 1984). The plasmid’s regions for replication, stability and mobilization are clustered within an 8 kb region which was ligated into pBR325 resulting in plasmid pGV910, a broad host range cloning vector with pVS1 regions essential for maintenance, stability and mobilization. pGV910 is 15.6 kb in size and has both ColE1 and pVS1 origins of replication (Van den Eede et al. 1992). Cosmid vector pRG930 was constructed by ligating the 1.6 kb BglII cos fragment from cosmid pLAFR1 (Friedman et al. 1982; Vanbleu et al. 2004) into the BamH1 site of pGV910 and inserting part of pUC8 into the unique EcoRI site. To increase the scale of antibiotic resistance, and therefore the host range, the CmR cassette of pBR325 was inserted into the unique HindIII site of pRG930 resulting in pRG930cm (Matthijs et al. 2004).
pGV910 and its descendants pRG930 and pRG930cm are not self-transmissible but can be mobilized by pRK2013 (Figurski and Helinski, 1979). pRK2013 is a ColE1 plasmid carrying its own mob genes plus the RK2 tra genes (Comai et al. 1983).
Knowledge of the genes and restriction sites present on plasmid pGV910 or on cosmids pRG930 and pRG930cm was lacking and could not be reconstructed from available sequences of the ancestor plasmids due to their mode of construction. However, pRG930cm has been used in the construction of a number of stable clone libraries in Pseudomonas, Burkholderia, and Actetobacter (Aendekerk et al. 2002; de Chial et al. 2003; Matthijs et al. 2004; Plesa et al. 2004; Denayer et al. 2007). Subcloning and further analysis of these clone libraries has been tedious due to the lack of the full DNA sequence of the cosmid.
We sequenced pRG930cm with average five-fold coverage by shotgun sequencing, for which each nucleotide position was sequenced at least three times. pRG930cm sequence is available under GenBank Accession Number FM174471. The sequencing procedure involved sonication of the entire cosmid DNA, end repair of the fragments and ligation of 1- to 2-kb DNA fragments into the SmaI site of pUC18 and transformation with E. coli XL1-Blue cells. Plasmids extracted from single colonies were used directly as template for sequencing (Ganguly et al. 2005). After standard ethanol precipitation of the samples, they were fractionated and analyzed on an ABI 3130 capillary sequencing device (Applied Biosystems, Foster City, CA). Sequence assembly was performed with Sequencher 4.1 software (Genecodes, Ann Arbor, MI). Both DNA strands were sequenced using shotgun sequencing while uncertain positions were verified by direct sequencing using pRG930cm-specific primers. The complete and truncated ORFs present on the vector were predicted using GeneMark hmm (Besemer and Borodovsky, 1999) and verified manually. The translated ORFs were compared to known proteins using standard protein-protein BLASTP (Altschul et al. 1990). Annotation of identified ORFs was done by manual curation and interpretation of outputs from a BLASTP search. Information obtained is summarized in Figure 1 and Table 1.
pRG930cm is a 17,256 bp cosmid with the ColE1 and pVS1 origins of replication. BLASTN similarity search shows that the 599 bp region (from nucleotide coordinates 16178 to 16776) corresponds to ColE1-ori. Nucleotide coordinates 5930 to 7195 correspond to the pVS1 ori based on similarity to the ori of replication of plasmid pZU634. The 1.7 kb cos region derived from cosmid pLAFR1 contains the cos site and two phage 80 genes, ORF1 and ORF2. ORF3 is a hypothetical protein with no significant homology to proteins in the databases.
In addition, regions conferring chloramphenicol (cat) and spectinomycin/streptomycin (aadA) resistance are present. The genes responsible for conferring tetracycline (tetA and tetR; positions 14503-14922 and 1195 bp-1412 respectively) and ampicillin resistances (bla; position 16938-17256) are non- functional truncations. pRG930cm has PstI, SalI, BamHI, XmaI, Sma I and EcoRI restriction sites in its multiple cloning site (MCS). Restriction enzyme SalI is however not unique and cannot be used for cloning. The presence of common unique restriction enzyme sites in the MCS enable efficient cloning into this vector. The truncated cat gene (position 18-464) is located adjacent to the MCS. An identical sequence of the complete cat gene occurs at position 13702-14361. This has made it difficult to design primers annealing to a unique sequence flanking the MCS. This has led to difficulties in analyzing cosmid inserts in the past. With the complete pRG930cm sequence determined, primers designed upstream (5’-GATACCGCGAGACCCACGCT-3’) and downstream (5’-CATTGCCATACGGAATTCCC-3’) of the MCS, respectively, have successfully been used in establishing the flanking sequences of cosmid inserts.
The parA, parG and parB gene cluster (6108-8239 bps) is involved in partioning and stabilization of the pRG930cm. ParB protein is responsible for localizing to opposite poles DNA sequences adjacent to the pVS1 ori. ParA ATPase activity is regulated by ParB (Abeles et al. 1985). The cosmid encoded pVS1 parG is homologous to the parG gene of plasmid TP288 partitioning system. The positioning of the genes upstream from parF in pVS1 has suggested that parG also plays a role in partitioning (Hayes, 2000). A pVS1 resolvase of the Serine Recombinase (SR) family is encoded on vector backbone positions 8538 to 9224. The protein is also likely to contribute to the segregational stability of pRG930cm by facilitating efficient partitioning through conversion of plasmid multimers into monomers (Swinfield et al. 1991). An integrase gene homologous to the P. aeruginosa integrase gene is also encoded in pRG930cm. Such integron-intergrases and are found to occur naturally in most mobile elements including transposons and conjugative plasmids (Esposito and Scocca, 1997).
pRG930cm also has a mob gene which encodes a Mob-like protein similar to that of E. coli species Sflu5. The rom gene which is adjuscent to the mob gene but transcribed in opposite direction codes for the Rom/Rop protein which plays a role in maintaining the cosmid copy number by inhibiting plasmid replication. This is by enhancing the pairing between RNA I and RNA II so that processing of the primer can be inhibited even at relatively low concentrations of RNA I (Cesareni et al. 1982).
The complete characterization of pRG930cm will enhance its role in restriction enzyme mapping and rapid chromosomal walking. The sequence may also be used to screen out components when “shotgun” sequencing inserts are cloned into this cosmid or into its predecessor pRG930.
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