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Stephen Farrand

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Yinping Qin; Carrie Keenan; Stephen K Farrand
N- and C-terminal regions of the quorum-sensing activator TraR cooperate in interactions with the alpha and sigma-70 components of RNA polymerase.
Ramón Penyalver; Phil M Oger; Shengchang Su; Belén Alvarez; Carmina I Salcedo; María M López; Stephen K Farrand
The S-adenosyl-L-homocysteine hydrolase gene ahcY of Agrobacterium radiobacter K84 is required for optimal growth, antibiotic production, and biocontrol of crown gall disease.
Sharik R Khan; Stephen K Farrand
The BlcC (AttM) lactonase of Agrobacterium tumefaciens does not quench the quorum-sensing system that regulates Ti plasmid conjugative transfer.

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2009: Yinping Qin; Carrie Keenan; Stephen K Farrand
N- and C-terminal regions of the quorum-sensing activator TraR cooperate in interactions with the alpha and sigma-70 components of RNA polymerase.
Molecular microbiology 2009;74(2):330-46.
2009: Ramón Penyalver; Phil M Oger; Shengchang Su; Belén Alvarez; Carmina I Salcedo; María M López; Stephen K Farrand
The S-adenosyl-L-homocysteine hydrolase gene ahcY of Agrobacterium radiobacter K84 is required for optimal growth, antibiotic production, and biocontrol of crown gall disease.
Molecular plant-microbe interactions : MPMI 2009;22(6):713-24.
2009: Sharik R Khan; Stephen K Farrand
The BlcC (AttM) lactonase of Agrobacterium tumefaciens does not quench the quorum-sensing system that regulates Ti plasmid conjugative transfer.
Journal of bacteriology 2009;191(4):1320-9.
2008: Sharik R Khan; Jennifer Gaines; R Martin Roop; Stephen K Farrand
Broad-host-range expression vectors with tightly regulated promoters and their use to examine the influence of TraR and TraM expression on Ti plasmid quorum sensing.
Applied and environmental microbiology 2008;74(16):5053-62.
2008: Shengchang Su; Sharik R Khan; Stephen K Farrand
Induction and loss of Ti plasmid conjugative competence in response to the acyl-homoserine lactone quorum-sensing signal.
Journal of bacteriology 2008;190(13):4398-407.
2008: Heenam Stanley Kim; Hyojeong Yi; Jaehee Myung; Kevin R Piper; Stephen K Farrand
Opine-based Agrobacterium competitiveness: dual expression control of the agrocinopine catabolism (acc) operon by agrocinopines and phosphate levels.
Journal of bacteriology 2008;190(10):3700-11.
2007: Panatda Saenkham; Warawan Eiamphungporn; Stephen K Farrand; Paiboon Vattanaviboon; skorn Mongkolsuk
Multiple superoxide dismutases in Agrobacterium tumefaciens: functional analysis, gene regulation, and influence on tumorigenesis.
Journal of bacteriology 2007;189(24):8807-17.
2007: Sharik R Khan; Jake Herman; Jessica Krank; Natalie J Serkova; Mair E A Churchill; Hiroaki Suga; Stephen K Farrand
N-(3-hydroxyhexanoyl)-l-homoserine lactone is the biologically relevant quormone that regulates the phz operon of Pseudomonas chlororaphis strain 30-84.
Applied and environmental microbiology 2007;73(22):7443-55.
2007: Yinping Qin; Shengchang Su; Stephen K Farrand
Molecular basis of transcriptional antiactivation. TraM disrupts the TraR-DNA complex through stepwise interactions.
The Journal of biological chemistry 2007;282(27):19979-91.
2006: Jung-Gun Kim; Byoung Keun Park; Sung-Uk Kim; Doil CHOI; Baek Hie Nahm; Jae Sun Moon; John Reader; Stephen K Farrand; Inhwan Hwang
Bases of biocontrol: sequence predicts synthesis and mode of action of agrocin 84, the Trojan horse antibiotic that controls crown gall.
Proceedings of the National Academy of Sciences of the United States of America 2006;103(23):8846-51.
2006: Shengchang Su; Bonnie B Stephens; Gladys Alexandre; Stephen K Farrand
Lon protease of the alpha-proteobacterium Agrobacterium tumefaciens is required for normal growth, cellular morphology and full virulence.
Microbiology (Reading, England) 2006;152(Pt 4):1197-207.
2005: John Reader; Phillip T Ordoukhanian; Jung-Gun Kim; Valérie de Crécy-Lagard; Inhwan Hwang; Stephen K Farrand; Paul Schimmel
Major biocontrol of plant tumors targets tRNA synthetase.
Science (New York, N.Y.) 2005;309(5740):1533.
2005: Sharik R Khan; Dmitri V Mavrodi; Geetanjali J Jog; Hiroaki Suga; Linda S Thomashow; Stephen K Farrand
Activation of the phz operon of Pseudomonas fluorescens 2-79 requires the LuxR homolog PhzR, N-(3-OH-Hexanoyl)-L-homoserine lactone produced by the LuxI homolog PhzI, and a cis-acting phz box.
Journal of bacteriology 2005;187(18):6517-27.
2005: Chang-Ho Baek; Stephen K Farrand; Dae-Kyun Park; Ko-Eun Lee; Won Hwang; Kun-Soo Kim
Genes for utilization of deoxyfructosyl glutamine (DFG), an amadori compound, are widely dispersed in the family Rhizobiaceae.
FEMS microbiology ecology 2005;53(2):221-33.
2004: Yinping Qin; Zhao-Qing Luo; Stephen K Farrand
Domains formed within the N-terminal region of the quorum-sensing activator TraR are required for transcriptional activation and direct interaction with RpoA from agrobacterium.
The Journal of biological chemistry 2004;279(39):40844-51.
2004: Yinping Qin; Audra J Smyth; Shengchang Su; Stephen K Farrand
Dimerization properties of TraM, the antiactivator that modulates TraR-mediated quorum-dependent expression of the Ti plasmid tra genes.
Molecular microbiology 2004;53(5):1471-85.
2004: S Teyssier-Cuvelle; Phil Oger; Christophe Mougel; K Groud; Stephen K Farrand; Xavier Nesme
A highly selectable and highly transferable Ti plasmid to study conjugal host range and Ti plasmid dissemination in complex ecosystems.
Microbial ecology 2004;48(1):10-8.
2004: Tae-Seok Ko; Sangman Lee; Stephen K Farrand; Schuyler S Korban
A partially disarmed vir helper plasmid, pKYRT1, in conjunction with 2,4-dichlorophenoxyactic acid promotes emergence of regenerable transgenic somatic embryos from immature cotyledons of soybean.
Planta 2004;218(4):536-41.
2003: Zhao-Qing Luo; Shengchang Su; Stephen K Farrand
In situ activation of the quorum-sensing transcription factor TraR by cognate and noncognate acyl-homoserine lactone ligands: kinetics and consequences.
Journal of bacteriology 2003;185(19):5665-72.
2003: Stephen K Farrand; Peter B Van Berkum; Phil Oger
Agrobacterium is a definable genus of the family Rhizobiaceae.
International journal of systematic and evolutionary microbiology 2003;53(Pt 5):1681-7.
2003: Zhao-Qing Luo; Audra J Smyth; Ping Gao; Yinping Qin; Stephen K Farrand
Mutational analysis of TraR. Correlating function with molecular structure of a quorum-sensing transcriptional activator.
The Journal of biological chemistry 2003;278(15):13173-82.
2003: Chang-Ho Baek; Stephen K Farrand; Ko-Eun Lee; Dae-Kyun Park; Jeong Kug Lee; Kun-Soo Kim
Convergent evolution of Amadori opine catabolic systems in plasmids of Agrobacterium tumefaciens.
Journal of bacteriology 2003;185(2):513-24.
2002: Phil Oger; Stephen K Farrand
Two opines control conjugal transfer of an Agrobacterium plasmid by regulating expression of separate copies of the quorum-sensing activator gene traR.
Journal of bacteriology 2002;184(4):1121-31.
2002: Stephen K Farrand; Yinping Qin; Phil Oger
Quorum-sensing system of Agrobacterium plasmids: analysis and utility.
Methods in enzymology 2002;358():452-84.
2001: Phil Oger; Stephen K Farrand
Co-evolution of the agrocinopine opines and the agrocinopine-mediated control of TraR, the quorum-sensing activator of the Ti plasmid conjugation system.
Molecular microbiology 2001;41(5):1173-85.
2001: Zhao-Qing Luo; Stephen K Farrand
The Agrobacterium tumefaciens rnd homolog is required for TraR-mediated quorum-dependent activation of Ti plasmid tra gene expression.
Journal of bacteriology 2001;183(13):3919-30.
2001: Kun-Soo Kim; Chang-Ho Baek; J K Lee; J M Yang; Stephen K Farrand
Intracellular accumulation of mannopine, an opine produced by crown gall tumors, transiently inhibits growth of Agrobacterium tumefaciens.
Molecular plant-microbe interactions : MPMI 2001;14(6):793-803.
2001: Ramón Penyalver; Phil Oger; María M López; Stephen K Farrand
Iron-binding compounds from Agrobacterium spp.: biological control strain Agrobacterium rhizogenes K84 produces a hydroxamate siderophore.
Applied and environmental microbiology 2001;67(2):654-64.
2001: Zhao-Qing Luo; T E Clemente; Stephen K Farrand
Construction of a derivative of Agrobacterium tumefaciens C58 that does not mutate to tetracycline resistance.
Molecular plant-microbe interactions : MPMI 2001;14(1):98-103.
2000: Yinping Qin; Zhao-Qing Luo; Audra J Smyth; Ping Gao; S Beck von Bodman; Stephen K Farrand
Quorum-sensing signal binding results in dimerization of TraR and its release from membranes into the cytoplasm.
The EMBO journal 2000;19(19):5212-21.
2000: K Palanichelvam; Phil Oger; Steven J Clough; C Cha; Andrew F Bent; Stephen K Farrand
A second T-region of the soybean-supervirulent chrysopine-type Ti plasmid pTiChry5, and construction of a fully disarmed vir helper plasmid.
Molecular plant-microbe interactions : MPMI 2000;13(10):1081-91.
2000: Zhao-Qing Luo; Yinping Qin; Stephen K Farrand
The antiactivator TraM interferes with the autoinducer-dependent binding of TraR to DNA by interacting with the C-terminal region of the quorum-sensing activator.
The Journal of biological chemistry 2000;275(11):7713-22.
2000: C M Hamilton; H Lee; PL Li; D M Cook; KR Piper; S B von Bodman; E Lanka; W Ream; Stephen K Farrand
TraG from RP4 and TraG and VirD4 from Ti plasmids confer relaxosome specificity to the conjugal transfer system of pTiC58.
Journal of bacteriology 2000;182(6):1541-8.
2000: KR Piper; Stephen K Farrand
Quorum sensing but not autoinduction of Ti plasmid conjugal transfer requires control by the opine regulon and the antiactivator TraM.
Journal of bacteriology 2000;182(4):1080-8.
2000: HJ Cho; Stephen K Farrand; Gregory R Noel; Jack M Widholm
High-efficiency induction of soybean hairy roots and propagation of the soybean cyst nematode.
Planta 2000;210(2):195-204.
2000: PL Li; Stephen K Farrand
The replicator of the nopaline-type Ti plasmid pTiC58 is a member of the repABC family and is influenced by the TraR-dependent quorum-sensing regulatory system.
Journal of bacteriology 2000;182(1):179-88.
1999: I Hwang; Audra J Smyth; Zhao-Qing Luo; Stephen K Farrand
Modulating quorum sensing by antiactivation: TraM interacts with TraR to inhibit activation of Ti plasmid conjugal transfer genes.
Molecular microbiology 1999;34(2):282-94.
1999: Zhao-Qing Luo; Stephen K Farrand
Signal-dependent DNA binding and functional domains of the quorum-sensing activator TraR as identified by repressor activity.
Proceedings of the National Academy of Sciences of the United States of America 1999;96(16):9009-14.
1999: PL Li; I Hwang; H Miyagi; Heather True; Stephen K Farrand
Essential components of the Ti plasmid trb system, a type IV macromolecular transporter.
Journal of bacteriology 1999;181(16):5033-41.
1999: KR Piper; S Beck Von Bodman; I Hwang; Stephen K Farrand
Hierarchical gene regulatory systems arising from fortuitous gene associations: controlling quorum sensing by the opine regulon in Agrobacterium.
Molecular microbiology 1999;32(5):1077-89.
1999: KR Piper; Stephen K Farrand
Conjugal transfer but not quorum-dependent tra gene induction of pTiC58 requires a solid surface.
Applied and environmental microbiology 1999;65(6):2798-801.
1999: Zhao-Qing Luo; Stephen K Farrand
Cloning and characterization of a tetracycline resistance determinant present in Agrobacterium tumefaciens C58.
Journal of bacteriology 1999;181(2):618-26.
1998: PL Li; D M Everhart; Stephen K Farrand
Genetic and sequence analysis of the pTiC58 trb locus, encoding a mating-pair formation system related to members of the type IV secretion family.
Journal of bacteriology 1998;180(23):6164-72.
1998: C Cha; Ping Gao; Y C Chen; PD Shaw; Stephen K Farrand
Production of acyl-homoserine lactone quorum-sensing signals by gram-negative plant-associated bacteria.
Molecular plant-microbe interactions : MPMI 1998;11(11):1119-29.
1998: Heenam Stanley Kim; Stephen K Farrand
Opine catabolic loci from Agrobacterium plasmids confer chemotaxis to their cognate substrates.
Molecular plant-microbe interactions : MPMI 1998;11(2):131-43.
1998: Phil Oger; K S Kim; R L Sackett; KR Piper; Stephen K Farrand
Octopine-type Ti plasmids code for a mannopine-inducible dominant-negative allele of traR, the quorum-sensing activator that regulates Ti plasmid conjugal transfer.
Molecular microbiology 1998;27(2):277-88.
1997: Heenam Stanley Kim; Stephen K Farrand
Characterization of the acc operon from the nopaline-type Ti plasmid pTiC58, which encodes utilization of agrocinopines A and B and susceptibility to agrocin 84.
Journal of bacteriology 1997;179(23):7559-72.
1997: S B Hong; I Hwang; Y Dessaux; P Guyon; K S Kim; Stephen K Farrand
A T-DNA gene required for agropine biosynthesis by transformed plants is functionally and evolutionarily related to a Ti plasmid gene required for catabolism of agropine by Agrobacterium strains.
Journal of bacteriology 1997;179(15):4831-40.
1997: PD Shaw; G Ping; S L Daly; C Cha; John E Cronan; K L Rinehart; Stephen K Farrand
Detecting and characterizing N-acyl-homoserine lactone signal molecules by thin-layer chromatography.
Proceedings of the National Academy of Sciences of the United States of America 1997;94(12):6036-41.
1997: D M Cook; P L Li; F Ruchaud; Sean Padden; Stephen K Farrand
Ti plasmid conjugation is independent of vir: reconstitution of the tra functions from pTiC58 as a binary system.
Journal of bacteriology 1997;179(4):1291-7.
1996: J Alt-Mörbe; J L Stryker; Clay Fuqua; PL Li; Stephen K Farrand; Stephen C Winans
The conjugal transfer system of Agrobacterium tumefaciens octopine-type Ti plasmids is closely related to the transfer system of an IncP plasmid and distantly related to Ti plasmid vir genes.
Journal of bacteriology 1996;178(14):4248-57.
1996: Stephen K Farrand; I Hwang; D M Cook
The tra region of the nopaline-type Ti plasmid is a chimera with elements related to the transfer systems of RSF1010, RP4, and F.
Journal of bacteriology 1996;178(14):4233-47.
1996: K S Kim; W S Chilton; Stephen K Farrand
A Ti plasmid-encoded enzyme required for degradation of mannopine is functionally homologous to the T-region-encoded enzyme required for synthesis of this opine in crown gall tumors.
Journal of bacteriology 1996;178(11):3285-92.
1996: K S Kim; Stephen K Farrand
Ti plasmid-encoded genes responsible for catabolism of the crown gall opine mannopine by Agrobacterium tumefaciens are homologs of the T-region genes responsible for synthesis of this opine by the plant tumor.
Journal of bacteriology 1996;178(11):3275-84.
1996: S B Hong; Stephen K Farrand
Purification and characterization of catabolic mannopine cyclase encoded by the Agrobacterium tumefaciens Ti plasmid pTi15955.
Journal of bacteriology 1996;178(8):2427-30.
1995: S Beck von Bodman; Stephen K Farrand
Capsular polysaccharide biosynthesis and pathogenicity in Erwinia stewartii require induction by an N-acylhomoserine lactone autoinducer.
Journal of bacteriology 1995;177(17):5000-8.
1995: S B von Bodman; L L Domier; Stephen K Farrand
Expression of multiple eukaryotic genes from a single promoter in Nicotiana.
Bio/technology (Nature Publishing Company) 1995;13(6):587-91.
1995: I Hwang; D M Cook; Stephen K Farrand
A new regulatory element modulates homoserine lactone-mediated autoinduction of Ti plasmid conjugal transfer.
Journal of bacteriology 1995;177(2):449-58.
1994: S B Hong; Stephen K Farrand
Functional role of the Ti plasmid-encoded catabolic mannopine cyclase in mannityl opine catabolism by Agrobacterium spp.
Journal of bacteriology 1994;176(12):3576-83.
1994: I Hwang; PL Li; L Zhang; KR Piper; D M Cook; M E Tate; Stephen K Farrand
TraI, a LuxI homologue, is responsible for production of conjugation factor, the Ti plasmid N-acylhomoserine lactone autoinducer.
Proceedings of the National Academy of Sciences of the United States of America 1994;91(11):4639-43.
1994: I Hwang; Stephen K Farrand
A novel gene tag for identifying microorganisms released into the environment.
Applied and environmental microbiology 1994;60(3):913-20.
1993: G T Hayman; S Beck von Bodman; Heenam Stanley Kim; P Jiang; Stephen K Farrand
Genetic analysis of the agrocinopine catabolic region of Agrobacterium tumefaciens Ti plasmid pTiC58, which encodes genes required for opine and agrocin 84 transport.
Journal of bacteriology 1993;175(17):5575-84.
1993: KR Piper; S Beck von Bodman; Stephen K Farrand
Conjugation factor of Agrobacterium tumefaciens regulates Ti plasmid transfer by autoinduction.
Nature 1993;362(6419):448-50.
1993: S B Hong; Yves Dessaux; W S Chilton; Stephen K Farrand
Organization and regulation of the mannopine cyclase-associated opine catabolism genes in Agrobacterium tumefaciens 15955.
Journal of bacteriology 1993;175(2):401-10.
1992: Stephen K Farrand; C L Wang; S B Hong; S B O'Morchoe; J E Slota
Deletion derivatives of pAgK84 and their use in the analysis of Agrobacterium plasmid functions.
Plasmid 1992;28(3):201-12.
1992: D M Cook; Stephen K Farrand
The oriT region of the Agrobacterium tumefaciens Ti plasmid pTiC58 shares DNA sequence identity with the transfer origins of RSF1010 and RK2/RP4 and with T-region borders.
Journal of bacteriology 1992;174(19):6238-46.
1992: S K Dhir; S Dhir; M A Savka; F Belanger; A L Kriz; Stephen K Farrand; Jack M Widholm
Regeneration of Transgenic Soybean (Glycine max) Plants from Electroporated Protoplasts.
Plant physiology 1992;99(1):81-8.
1992: G LaPointe; C S Nautiyal; W S Chilton; Stephen K Farrand; P Dion
Spontaneous mutation conferring the ability to catabolize mannopine in Agrobacterium tumefaciens.
Journal of bacteriology 1992;174(8):2631-9.
1992: M A Savka; Stephen K Farrand
Mannityl opine accumulation and exudation by transgenic tobacco.
Plant physiology 1992;98(2):784-9.
1992: S Beck von Bodman; G T Hayman; Stephen K Farrand
Opine catabolism and conjugal transfer of the nopaline Ti plasmid pTiC58 are coordinately regulated by a single repressor.
Proceedings of the National Academy of Sciences of the United States of America 1992;89(2):643-7.
1990: G T Hayman; Stephen K Farrand
Agrobacterium plasmids encode structurally and functionally different loci for catabolism of agrocinopine-type opines.
Molecular & general genetics : MGG 1990;223(3):465-73.
1990: Stephen K Farrand; J Tempé; Yves Dessaux
Localization and characterization of the region encoding catabolism of mannopinic acid from the octopine-type Ti plasmid pTi15955.
Molecular plant-microbe interactions : MPMI 1990;3(4):259-67.
1989: Stephen K Farrand; S P O'Morchoe; J McCutchan
Construction of an Agrobacterium tumefaciens C58 recA mutant.
Journal of bacteriology 1989;171(10):5314-21.
1989: S B von Bodman; J E McCutchan; Stephen K Farrand
Characterization of conjugal transfer functions of Agrobacterium tumefaciens Ti plasmid pTiC58.
Journal of bacteriology 1989;171(10):5281-9.
1988: Yves Dessaux; P Guyon; Annik Petit; J Tempé; M Demarez; Christianne Legrain; M E Tate; Stephen K Farrand
Opine utilization by Agrobacterium spp.: octopine-type Ti plasmids encode two pathways for mannopinic acid degradation.
Journal of bacteriology 1988;170(7):2939-46.
1988: G T Hayman; Stephen K Farrand
Characterization and mapping of the agrocinopine-agrocin 84 locus on the nopaline Ti plasmid pTiC58.
Journal of bacteriology 1988;170(4):1759-67.
1987: M H Ryder; J E Slota; A Scarim; Stephen K Farrand
Genetic analysis of agrocin 84 production and immunity in Agrobacterium spp.
Journal of bacteriology 1987;169(9):4184-9.
1987: Yves Dessaux; J Tempé; Stephen K Farrand
Genetic analysis of mannityl opine catabolism in octopine-type Agrobacterium tumefaciens strain 15955.
Molecular & general genetics : MGG 1987;208(1-2):301-8.
1986: Yves Dessaux; P Guyon; Stephen K Farrand; Annik Petit; J Tempé
Agrobacterium Ti and Ri plasmids specify enzymic lactonization of mannopine to agropine.
Journal of general microbiology 1986;132(9):2549-59.
1986: Stephen K Farrand; Yves Dessaux
Proline biosynthesis encoded by the noc and occ loci of Agrobacterium Ti plasmids.
Journal of bacteriology 1986;167(2):732-4.
1985: Stephen K Farrand; J E Slota; J S Shim; A Kerr
Tn5 insertions in the agrocin 84 plasmid: the conjugal nature of pAgK84 and the locations of determinants for transfer and agrocin 84 production.
Plasmid 1985;13(2):106-17.
1982: J E Slota; Stephen K Farrand
Genetic isolation and physical characterization of pAgK84, the plasmid responsible for agrocin 84 production.
Plasmid 1982;8(2):175-86.