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Donald Helinski

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Celine Verheust; Donald R Helinski
The incC korB region of RK2 repositions a mini-RK2 replicon in Escherichia coli.
Shiyin Yao; Donald R Helinski; Aresa Toukdarian
Localization of the naturally occurring plasmid ColE1 at the cell pole.
Shiyin Yao; Aresa Toukdarian; Donald R Helinski
Inhibition of protein and RNA synthesis in Escherichia coli results in declustering of plasmid RK2.

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All Publications

2007: Celine Verheust; Donald R Helinski
The incC korB region of RK2 repositions a mini-RK2 replicon in Escherichia coli.
Plasmid 2007;58(2):195-204.
2007: Shiyin Yao; Donald R Helinski; Aresa Toukdarian
Localization of the naturally occurring plasmid ColE1 at the cell pole.
Journal of bacteriology 2007;189(5):1946-53.
2006: Shiyin Yao; Aresa Toukdarian; Donald R Helinski
Inhibition of protein and RNA synthesis in Escherichia coli results in declustering of plasmid RK2.
Plasmid 2006;56(2):124-32.
2006: Yong Jiang; Shiyin Yao; Donald R Helinski; Aresa Toukdarian
Functional analysis of two putative chromosomal replication origins from Pseudomonas aeruginosa.
Plasmid 2006;55(3):194-200.
2005: Zhenping Zhong; Donald R Helinski; Aresa Toukdarian
Plasmid host-range: restrictions to F replication in Pseudomonas.
Plasmid 2005;54(1):48-56.
2005: Erik P Johnson; Shiyin Yao; Donald R Helinski
Gyrase inhibitors and thymine starvation disrupt the normal pattern of plasmid RK2 localization in Escherichia coli.
Journal of bacteriology 2005;187(10):3538-47.
2003: Zhenping Zhong; Donald R Helinski; Aresa Toukdarian
A specific region in the N terminus of a replication initiation protein of plasmid RK2 is required for recruitment of Pseudomonas aeruginosa DnaB helicase to the plasmid origin.
The Journal of biological chemistry 2003;278(46):45305-10.
2003: Yong Jiang; Marcin Pacek; Donald R Helinski; Igor Konieczny; Aresa Toukdarian
A multifunctional plasmid-encoded replication initiation protein both recruits and positions an active helicase at the replication origin.
Proceedings of the National Academy of Sciences of the United States of America 2003;100(15):8692-7.
2003: Zhenping Zhong; Ron Caspi; Donald R Helinski; Vic Knauf; Sean Sykes; Colleen O'Byrne; Terrance P Shea; Jane E Wilkinson; Craig DeLoughery; Aresa Toukdarian
Nucleotide sequence based characterizations of two cryptic plasmids from the marine bacterium Ruegeria isolate PR1b.
Plasmid 2003;49(3):233-52.
2002: Yong Jiang; Joe Pogliano; Donald R Helinski; Igor Konieczny
ParE toxin encoded by the broad-host-range plasmid RK2 is an inhibitor of Escherichia coli gyrase.
Molecular microbiology 2002;44(4):971-9.
2002: Zhenping Zhong; Ron Caspi; tracy mincer; Donald R Helinski; Vic Knauf; Kari Boardman; Jane E Wilkinson; Terry Shea; Craig DeLoughery; Aresa Toukdarian
A 50-kb plasmid rich in mobile gene sequences isolated from a marine micrococcus.
Plasmid 2002;47(1):1-9.
2001: Zhenping Zhong; Aresa Toukdarian; Donald R Helinski; Vic Knauf; S Sykes; Jane E Wilkinson; C O'Bryne; T Shea; Craig DeLoughery; Ron Caspi
Sequence analysis of a 101-kilobase plasmid required for agar degradation by a Microscilla isolate.
Applied and environmental microbiology 2001;67(12):5771-9.
2001: Ron Caspi; Marcin Pacek; G Consiglieri; Donald R Helinski; Aresa Toukdarian; Igor Konieczny
A broad host range replicon with different requirements for replication initiation in three bacterial species.
The EMBO journal 2001;20(12):3262-71.
2001: Joe Pogliano; T Q Ho; Zhenping Zhong; Donald R Helinski
Multicopy plasmids are clustered and localized in Escherichia coli.
Proceedings of the National Academy of Sciences of the United States of America 2001;98(8):4486-91.
2000: Ron Caspi; Donald R Helinski; Marcin Pacek; Igor Konieczny
Interactions of DnaA proteins from distantly related bacteria with the replication origin of the broad host range plasmid RK2.
The Journal of biological chemistry 2000;275(24):18454-61.
1999: E P Johnson; tracy mincer; H Schwab; A B Burgin; Donald R Helinski
Plasmid RK2 ParB protein: purification and nuclease properties.
Journal of bacteriology 1999;181(19):6010-8.
1999: Kelly S Doran; Donald R Helinski; Igor Konieczny
Host-dependent requirement for specific DnaA boxes for plasmid RK2 replication.
Molecular microbiology 1999;33(3):490-8.
1999: Kelly S Doran; Donald R Helinski; Igor Konieczny
A critical DnaA box directs the cooperative binding of the Escherichia coli DnaA protein to the plasmid RK2 replication origin.
The Journal of biological chemistry 1999;274(25):17918-23.
1998: Aresa Toukdarian; Donald R Helinski
TrfA dimers play a role in copy-number control of RK2 replication.
Gene 1998;223(1-2):205-11.
1998: C L Easter; H Schwab; Donald R Helinski
Role of the parCBA operon of the broad-host-range plasmid RK2 in stable plasmid maintenance.
Journal of bacteriology 1998;180(22):6023-30.
1998: PA Sobecky; tracy mincer; M C Chang; Aresa Toukdarian; Donald R Helinski
Isolation of broad-host-range replicons from marine sediment bacteria.
Applied and environmental microbiology 1998;64(8):2822-30.
1998: Kelly S Doran; Igor Konieczny; Donald R Helinski
Replication origin of the broad host range plasmid RK2. Positioning of various motifs is critical for initiation of replication.
The Journal of biological chemistry 1998;273(14):8447-53.
1997: Igor Konieczny; Donald R Helinski
Helicase delivery and activation by DnaA and TrfA proteins during the initiation of replication of the broad host range plasmid RK2.
The Journal of biological chemistry 1997;272(52):33312-8.
1997: Igor Konieczny; Donald R Helinski
The replication initiation protein of the broad-host-range plasmid RK2 is activated by the ClpX chaperone.
Proceedings of the National Academy of Sciences of the United States of America 1997;94(26):14378-82.
1997: C L Easter; PA Sobecky; Donald R Helinski
Contribution of different segments of the par region to stable maintenance of the broad-host-range plasmid RK2.
Journal of bacteriology 1997;179(20):6472-9.
1997: Igor Konieczny; Kelly S Doran; Donald R Helinski; A Blasina
Role of TrfA and DnaA proteins in origin opening during initiation of DNA replication of the broad host range plasmid RK2.
The Journal of biological chemistry 1997;272(32):20173-8.
1997: PA Sobecky; tracy mincer; M C Chang; Donald R Helinski
Plasmids isolated from marine sediment microbial communities contain replication and incompatibility regions unrelated to those of known plasmid groups.
Applied and environmental microbiology 1997;63(3):888-95.
1996: A Blasina; B L Kittell; A E Toukdarian; Donald R Helinski
Copy-up mutants of the plasmid RK2 replication initiation protein are defective in coupling RK2 replication origins.
Proceedings of the National Academy of Sciences of the United States of America 1996;93(8):3559-64.
1996: P A Sobecky; C L Easter; P D Bear; Donald R Helinski
Characterization of the stable maintenance properties of the par region of broad-host-range plasmid RK2.
Journal of bacteriology 1996;178(7):2086-93.
1996: A E Toukdarian; Donald R Helinski; S Perri
The plasmid RK2 initiation protein binds to the origin of replication as a monomer.
The Journal of biological chemistry 1996;271(12):7072-8.
1996: E P Johnson; A R Strom; Donald R Helinski
Plasmid RK2 toxin protein ParE: purification and interaction with the ParD antitoxin protein.
Journal of bacteriology 1996;178(5):1420-9.
1995: E A Sia; R C Roberts; C Easter; Donald R Helinski; David H Figurski
Different relative importances of the par operons and the effect of conjugal transfer on the maintenance of intact promiscuous plasmid RK2.
Journal of bacteriology 1995;177(10):2789-97.
1995: Grzegorz Wegrzyn; Alicja Wegrzyn; Igor Konieczny; Krzysztof Piotr Bielawski; Grazyna Konopa; Michal Obuchowski; Donald R Helinski; K Taylor
Involvement of the host initiator function dnaA in the replication of coliphage lambda.
Genetics 1995;139(4):1469-81.
1995: E K Monson; G S Ditta; Donald R Helinski
The oxygen sensor protein, FixL, of Rhizobium meliloti. Role of histidine residues in heme binding, phosphorylation, and signal transduction.
The Journal of biological chemistry 1995;270(10):5243-50.
1994: Peter Agron; E K Monson; G S Ditta; Donald R Helinski
Oxygen regulation of expression of nitrogen fixation genes in Rhizobium meliloti.
Research in microbiology 1994;145(5-6):454-9.
1994: R C Roberts; A R Ström; Donald R Helinski
The parDE operon of the broad-host-range plasmid RK2 specifies growth inhibition associated with plasmid loss.
Journal of molecular biology 1994;237(1):35-51.
1994: J L Cereghino; Donald R Helinski; A E Toukdarian
Isolation and characterization of DNA-binding mutants of a plasmid replication initiation protein utilizing an in vivo binding assay.
Plasmid 1994;31(1):89-99.
1993: R C Roberts; C Spangler; Donald R Helinski
Characteristics and significance of DNA binding activity of plasmid stabilization protein ParD from the broad host-range plasmid RK2.
The Journal of biological chemistry 1993;268(36):27109-17.
1993: M Weinstein; Augusto Lois; G S Ditta; Donald R Helinski
Mutants of the two-component regulatory protein FixJ of Rhizobium meliloti that have increased activity at the nifA promoter.
Gene 1993;134(2):145-52.
1993: J L Cereghino; Donald R Helinski
Essentiality of the three carboxyl-terminal amino acids of the plasmid RK2 replication initiation protein TrfA for DNA binding and replication activity in gram-negative bacteria.
The Journal of biological chemistry 1993;268(33):24926-32.
1993: Ferric C Fang; R H Durland; Donald R Helinski
Mutations in the gene encoding the replication-initiation protein of plasmid RK2 produce elevated copy numbers of RK2 derivatives in Escherichia coli and distantly related bacteria.
Gene 1993;133(1):1-8.
1993: Peter Agron; G S Ditta; Donald R Helinski
Oxygen regulation of nifA transcription in vitro.
Proceedings of the National Academy of Sciences of the United States of America 1993;90(8):3506-10.
1993: Augusto Lois; M Weinstein; G S Ditta; Donald R Helinski
Autophosphorylation and phosphatase activities of the oxygen-sensing protein FixL of Rhizobium meliloti are coordinately regulated by oxygen.
The Journal of biological chemistry 1993;268(6):4370-5.
1993: S Perri; Donald R Helinski
DNA sequence requirements for interaction of the RK2 replication initiation protein with plasmid origin repeats.
The Journal of biological chemistry 1993;268(5):3662-9.
1993: Augusto Lois; G S Ditta; Donald R Helinski
The oxygen sensor FixL of Rhizobium meliloti is a membrane protein containing four possible transmembrane segments.
Journal of bacteriology 1993;175(4):1103-9.
1992: R C Roberts; Donald R Helinski
Definition of a minimal plasmid stabilization system from the broad-host-range plasmid RK2.
Journal of bacteriology 1992;174(24):8119-32.
1992: M Weinstein; R C Roberts; Donald R Helinski
A region of the broad-host-range plasmid RK2 causes stable in planta inheritance of plasmids in Rhizobium meliloti cells isolated from alfalfa root nodules.
Journal of bacteriology 1992;174(22):7486-9.
1992: M Weinstein; Augusto Lois; E K Monson; G S Ditta; Donald R Helinski
Isolation of phosphorylation-deficient mutants of the Rhizobium meliloti two-component regulatory protein, FixJ.
Molecular microbiology 1992;6(15):2041-9.
1992: T L Davis; Donald R Helinski; R C Roberts
Transcription and autoregulation of the stabilizing functions of broad-host-range plasmid RK2 in Escherichia coli, Agrobacterium tumefaciens and Pseudomonas aeruginosa.
Molecular microbiology 1992;6(14):1981-94.
1992: Peter Agron; G S Ditta; Donald R Helinski
Mutational analysis of the Rhizobium meliloti nifA promoter.
Journal of bacteriology 1992;174(12):4120-9.
1992: J Lin; Donald R Helinski
Analysis of mutations in trfA, the replication initiation gene of the broad-host-range plasmid RK2.
Journal of bacteriology 1992;174(12):4110-9.
1992: E K Monson; M Weinstein; G S Ditta; Donald R Helinski
The FixL protein of Rhizobium meliloti can be separated into a heme-binding oxygen-sensing domain and a functional C-terminal kinase domain.
Proceedings of the National Academy of Sciences of the United States of America 1992;89(10):4280-4.
1992: A Greener; S M Lehman; Donald R Helinski
Promoters of the broad host range plasmid RK2: analysis of transcription (initiation) in five species of gram-negative bacteria.
Genetics 1992;130(1):27-36.
1991: Ferric C Fang; Donald R Helinski
Broad-host-range properties of plasmid RK2: importance of overlapping genes encoding the plasmid replication initiation protein TrfA.
Journal of bacteriology 1991;173(18):5861-8.
1991: S Perri; Donald R Helinski; A Toukdarian
Interactions of plasmid-encoded replication initiation proteins with the origin of DNA replication in the broad host range plasmid RK2.
The Journal of biological chemistry 1991;266(19):12536-43.
1991: M A Gilles-Gonzalez; G S Ditta; Donald R Helinski
A haemoprotein with kinase activity encoded by the oxygen sensor of Rhizobium meliloti.
Nature 1991;350(6314):170-2.
1991: Svein Valla; K Haugan; R Durland; Donald R Helinski
Isolation and properties of temperature-sensitive mutants of the trfA gene of the broad host range plasmid RK2.
Plasmid 1991;25(2):131-6.
1991: B L Kittell; Donald R Helinski
Iteron inhibition of plasmid RK2 replication in vitro: evidence for intermolecular coupling of replication origins as a mechanism for RK2 replication control.
Proceedings of the National Academy of Sciences of the United States of America 1991;88(4):1389-93.
1990: R C Roberts; R Burioni; Donald R Helinski
Genetic characterization of the stabilizing functions of a region of broad-host-range plasmid RK2.
Journal of bacteriology 1990;172(11):6204-16.
1990: A Greener; Marcin Filutowicz; Michael J. McEachern; Donald R Helinski
N-terminal truncated forms of the bifunctional pi initiation protein express negative activity on plasmid R6K replication.
Molecular & general genetics : MGG 1990;224(1):24-32.
1990: R H Durland; A Toukdarian; F Fang; Donald R Helinski
Mutations in the trfA replication gene of the broad-host-range plasmid RK2 result in elevated plasmid copy numbers.
Journal of bacteriology 1990;172(7):3859-67.
1990: R H Durland; Donald R Helinski
Replication of the broad-host-range plasmid RK2: direct measurement of intracellular concentrations of the essential TrfA replication proteins and their effect on plasmid copy number.
Journal of bacteriology 1990;172(7):3849-58.
1990: T Dylan; P Nagpal; Donald R Helinski; G S Ditta
Symbiotic pseudorevertants of Rhizobium meliloti ndv mutants.
Journal of bacteriology 1990;172(3):1409-17.
1990: T Dylan; Donald R Helinski; G S Ditta
Hypoosmotic adaptation in Rhizobium meliloti requires beta-(1----2)-glucan.
Journal of bacteriology 1990;172(3):1400-8.
1990: L Ielpi; T Dylan; G S Ditta; Donald R Helinski; S W Stanfield
The ndvB locus of Rhizobium meliloti encodes a 319-kDa protein involved in the production of beta-(1----2)-glucan.
The Journal of biological chemistry 1990;265(5):2843-51.
1989: Michael J. McEachern; M A Bott; P A Tooker; Donald R Helinski
Negative control of plasmid R6K replication: possible role of intermolecular coupling of replication origins.
Proceedings of the National Academy of Sciences of the United States of America 1989;86(20):7942-6.
1989: B L Kittell; Donald R Helinski; G S Ditta
Aromatic aminotransferase activity and indoleacetic acid production in Rhizobium meliloti.
Journal of bacteriology 1989;171(10):5458-66.
1989: A J Palomares; M A DeLuca; Donald R Helinski
Firefly luciferase as a reporter enzyme for measuring gene expression in vegetative and symbiotic Rhizobium meliloti and other gram-negative bacteria.
Gene 1989;81(1):55-64.
1989: T J Schmidhauser; D H Bechhofer; David H Figurski; Donald R Helinski
Host-specific effects of the korA-korB operon and oriT region on the maintenance of miniplasmid derivatives of broad host-range plasmid RK2.
Plasmid 1989;21(2):99-112.
1988: S W Stanfield; L Ielpi; David A O'Brochta; Donald R Helinski; G S Ditta
The ndvA gene product of Rhizobium meliloti is required for beta-(1----2)glucan production and has homology to the ATP-binding export protein HlyB.
Journal of bacteriology 1988;170(8):3523-30.
1988: E L Virts; S W Stanfield; Donald R Helinski; G S Ditta
Common regulatory elements control symbiotic and microaerobic induction of nifA in Rhizobium meliloti.
Proceedings of the National Academy of Sciences of the United States of America 1988;85(9):3062-5.
1988: T J Schmidhauser; G Ditta; Donald R Helinski
Broad-host-range plasmid cloning vectors for gram-negative bacteria.
Biotechnology (Reading, Mass.) 1988;10():287-332.
1987: R H Durland; Donald R Helinski
The sequence encoding the 43-kilodalton trfA protein is required for efficient replication or maintenance of minimal RK2 replicons in Pseudomonas aeruginosa.
Plasmid 1987;18(2):164-9.
1987: Marcin Filutowicz; Michael J. McEachern; P Mukhopadhyay; A Greener; S L Yang; Donald R Helinski
DNA and protein interactions in the regulation of plasmid replication.
Journal of cell science. Supplement 1987;7():15-31.
1986: Marcin Filutowicz; Michael J. McEachern; Donald R Helinski
Positive and negative roles of an initiator protein at an origin of replication.
Proceedings of the National Academy of Sciences of the United States of America 1986;83(24):9645-9.
1986: P Mukhopadhyay; Marcin Filutowicz; Donald R Helinski
Replication from one of the three origins of the plasmid R6K requires coupled expression of two plasmid-encoded proteins.
The Journal of biological chemistry 1986;261(20):9534-9.
1986: T Dylan; L Ielpi; S Stanfield; L Kashyap; C Douglas; Martin F Yanofsky; E Nester; Donald R Helinski; Gary Ditta
Rhizobium meliloti genes required for nodule development are related to chromosomal virulence genes in Agrobacterium tumefaciens.
Proceedings of the National Academy of Sciences of the United States of America 1986;83(12):4403-7.
1986: S W Stanfield; Donald R Helinski
Multiple mechanisms generate extrachromosomal circular DNA in Chinese hamster ovary cells.
Nucleic acids research 1986;14(8):3527-38.
1985: M Better; G Ditta; Donald R Helinski
Deletion analysis of Rhizobium meliloti symbiotic promoters.
The EMBO journal 1985;4(10):2419-24.
1985: T J Schmidhauser; Donald R Helinski
Regions of broad-host-range plasmid RK2 involved in replication and stable maintenance in nine species of gram-negative bacteria.
Journal of bacteriology 1985;164(1):446-55.
1985: G K Chikami; Donald G Guiney; T J Schmidhauser; Donald R Helinski
Comparison of 10 IncP plasmids: homology in the regions involved in plasmid replication.
Journal of bacteriology 1985;162(2):656-60.
1985: Michael J. McEachern; Marcin Filutowicz; Donald R Helinski
Mutations in direct repeat sequences and in a conserved sequence adjacent to the repeats result in a defective replication origin in plasmid R6K.
Proceedings of the National Academy of Sciences of the United States of America 1985;82(5):1480-4.
1985: G Ditta; T Schmidhauser; Emanuel Yakobson; P Lu; X W Liang; D R Finlay; Donald G Guiney; Donald R Helinski
Plasmids related to the broad host range vector, pRK290, useful for gene cloning and for monitoring gene expression.
Plasmid 1985;13(2):149-53.
1985: Marcin Filutowicz; G Davis; A Greener; Donald R Helinski
Autorepressor properties of the pi-initiation protein encoded by plasmid R6K.
Nucleic acids research 1985;13(1):103-14.
1985: Marcin Filutowicz; Michael J. McEachern; A Greener; P Mukhopadhyay; E Uhlenhopp; R Durland; Donald R Helinski
Role of the pi initiation protein and direct nucleotide sequence repeats in the regulation of plasmid R6K replication.
Basic life sciences 1985;30():125-40.
1984: S W Stanfield; Donald R Helinski
Cloning and characterization of small circular DNA from Chinese hamster ovary cells.
Molecular and cellular biology 1984;4(1):173-80.
1983: M Better; B Lewis; D Corbin; G Ditta; Donald R Helinski
Structural relationships among Rhizobium meliloti symbiotic promoters.
Cell 1983;35(2 Pt 1):479-85.
1983: T J Schmidhauser; M Filutowicz; Donald R Helinski
Replication of derivatives of the broad host range plasmid RK2 in two distantly related bacteria.
Plasmid 1983;9(3):325-30.
1982: D Corbin; G Ditta; Donald R Helinski
Clustering of nitrogen fixation (nif) genes in Rhizobium meliloti.
Journal of bacteriology 1982;149(1):221-8.
1980: G Ditta; S Stanfield; D Corbin; Donald R Helinski
Broad host range DNA cloning system for gram-negative bacteria: construction of a gene bank of Rhizobium meliloti.
Proceedings of the National Academy of Sciences of the United States of America 1980;77(12):7347-51.