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Quorum-dependent transfer of the opine-catabolic plasmid pAoF64/95 is regulated by a novel mechanism involving inhibition of the TraR antiactivator TraM.

Wetzel ME, Asenstorfer RE, Tate ME, Farrand SK.

Microbiologyopen. 2019 Jan;8(1):e00625. doi: 10.1002/mbo3.625. Epub 2018 Apr 10.


The repABC Plasmids with Quorum-Regulated Transfer Systems in Members of the Rhizobiales Divide into Two Structurally and Separately Evolving Groups.

Wetzel ME, Olsen GJ, Chakravartty V, Farrand SK.

Genome Biol Evol. 2015 Nov 19;7(12):3337-57. doi: 10.1093/gbe/evv227.


A signaling pathway involving the diguanylate cyclase CelR and the response regulator DivK controls cellulose synthesis in Agrobacterium tumefaciens.

Barnhart DM, Su S, Farrand SK.

J Bacteriol. 2014 Mar;196(6):1257-74. doi: 10.1128/JB.01446-13. Epub 2014 Jan 17.


Quorum-dependent mannopine-inducible conjugative transfer of an Agrobacterium opine-catabolic plasmid.

Wetzel ME, Kim KS, Miller M, Olsen GJ, Farrand SK.

J Bacteriol. 2014 Mar;196(5):1031-44. doi: 10.1128/JB.01365-13. Epub 2013 Dec 20.


CelR, an ortholog of the diguanylate cyclase PleD of Caulobacter, regulates cellulose synthesis in Agrobacterium tumefaciens.

Barnhart DM, Su S, Baccaro BE, Banta LM, Farrand SK.

Appl Environ Microbiol. 2013 Dec;79(23):7188-202. doi: 10.1128/AEM.02148-13. Epub 2013 Sep 13.


Reconciliation of sequence data and updated annotation of the genome of Agrobacterium tumefaciens C58, and distribution of a linear chromosome in the genus Agrobacterium.

Slater S, Setubal JC, Goodner B, Houmiel K, Sun J, Kaul R, Goldman BS, Farrand SK, Almeida N Jr, Burr T, Nester E, Rhoads DM, Kadoi R, Ostheimer T, Pride N, Sabo A, Henry E, Telepak E, Cromes L, Harkleroad A, Oliphant L, Pratt-Szegila P, Welch R, Wood D.

Appl Environ Microbiol. 2013 Feb;79(4):1414-7. doi: 10.1128/AEM.03192-12. Epub 2012 Dec 14.


N- and C-terminal regions of the quorum-sensing activator TraR cooperate in interactions with the alpha and sigma-70 components of RNA polymerase.

Qin Y, Keenan C, Farrand SK.

Mol Microbiol. 2009 Oct;74(2):330-46. doi: 10.1111/j.1365-2958.2009.06865.x. Epub 2009 Sep 2.


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.

Penyalver R, Oger PM, Su S, Alvarez B, Salcedo CI, López MM, Farrand SK.

Mol Plant Microbe Interact. 2009 Jun;22(6):713-24. doi: 10.1094/MPMI-22-6-0713.


Genome sequences of three agrobacterium biovars help elucidate the evolution of multichromosome genomes in bacteria.

Slater SC, Goldman BS, Goodner B, Setubal JC, Farrand SK, Nester EW, Burr TJ, Banta L, Dickerman AW, Paulsen I, Otten L, Suen G, Welch R, Almeida NF, Arnold F, Burton OT, Du Z, Ewing A, Godsy E, Heisel S, Houmiel KL, Jhaveri J, Lu J, Miller NM, Norton S, Chen Q, Phoolcharoen W, Ohlin V, Ondrusek D, Pride N, Stricklin SL, Sun J, Wheeler C, Wilson L, Zhu H, Wood DW.

J Bacteriol. 2009 Apr;191(8):2501-11. doi: 10.1128/JB.01779-08. Epub 2009 Feb 27.


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.

Khan SR, Gaines J, Roop RM 2nd, Farrand SK.

Appl Environ Microbiol. 2008 Aug;74(16):5053-62. doi: 10.1128/AEM.01098-08. Epub 2008 Jul 7.


Opine-based Agrobacterium competitiveness: dual expression control of the agrocinopine catabolism (acc) operon by agrocinopines and phosphate levels.

Kim HS, Yi H, Myung J, Piper KR, Farrand SK.

J Bacteriol. 2008 May;190(10):3700-11. doi: 10.1128/JB.00067-08. Epub 2008 Mar 14.


Induction and loss of Ti plasmid conjugative competence in response to the acyl-homoserine lactone quorum-sensing signal.

Su S, Khan SR, Farrand SK.

J Bacteriol. 2008 Jul;190(13):4398-407. doi: 10.1128/JB.01684-07. Epub 2008 Jan 18.


Multiple superoxide dismutases in Agrobacterium tumefaciens: functional analysis, gene regulation, and influence on tumorigenesis.

Saenkham P, Eiamphungporn W, Farrand SK, Vattanaviboon P, Mongkolsuk S.

J Bacteriol. 2007 Dec;189(24):8807-17. Epub 2007 Oct 5.


N-(3-hydroxyhexanoyl)-l-homoserine lactone is the biologically relevant quormone that regulates the phz operon of Pseudomonas chlororaphis strain 30-84.

Khan SR, Herman J, Krank J, Serkova NJ, Churchill ME, Suga H, Farrand SK.

Appl Environ Microbiol. 2007 Nov;73(22):7443-55. Epub 2007 Oct 5.


Molecular basis of transcriptional antiactivation. TraM disrupts the TraR-DNA complex through stepwise interactions.

Qin Y, Su S, Farrand SK.

J Biol Chem. 2007 Jul 6;282(27):19979-91. Epub 2007 May 1.


Bases of biocontrol: sequence predicts synthesis and mode of action of agrocin 84, the Trojan horse antibiotic that controls crown gall.

Kim JG, Park BK, Kim SU, Choi D, Nahm BH, Moon JS, Reader JS, Farrand SK, Hwang I.

Proc Natl Acad Sci U S A. 2006 Jun 6;103(23):8846-51. Epub 2006 May 26.


Genes for utilization of deoxyfructosyl glutamine (DFG), an amadori compound, are widely dispersed in the family Rhizobiaceae.

Baek CH, Farrand SK, Park DK, Lee KE, Hwang W, Kim KS.

FEMS Microbiol Ecol. 2005 Jul 1;53(2):221-33. Epub 2005 Jan 19.


A highly selectable and highly transferable Ti plasmid to study conjugal host range and Ti plasmid dissemination in complex ecosystems.

Teyssier-Cuvelle S, Oger P, Mougel C, Groud K, Farrand SK, Nesme X.

Microb Ecol. 2004 Jul;48(1):10-8. Epub 2004 May 28.


Agrobacterium is a definable genus of the family Rhizobiaceae.

Farrand SK, Van Berkum PB, Oger P.

Int J Syst Evol Microbiol. 2003 Sep;53(Pt 5):1681-7.


Mutational analysis of TraR. Correlating function with molecular structure of a quorum-sensing transcriptional activator.

Luo ZQ, Smyth AJ, Gao P, Qin Y, Farrand SK.

J Biol Chem. 2003 Apr 11;278(15):13173-82. Epub 2003 Feb 4.


Convergent evolution of Amadori opine catabolic systems in plasmids of Agrobacterium tumefaciens.

Baek CH, Farrand SK, Lee KE, Park DK, Lee JK, Kim KS.

J Bacteriol. 2003 Jan;185(2):513-24.


Quorum-sensing system of Agrobacterium plasmids: analysis and utility.

Farrand SK, Qin Y, Oger P.

Methods Enzymol. 2002;358:452-84. No abstract available.


Intracellular accumulation of mannopine, an opine produced by crown gall tumors, transiently inhibits growth of Agrobacterium tumefaciens.

Kim KS, Baek CH, Lee JK, Yang JM, Farrand SK.

Mol Plant Microbe Interact. 2001 Jun;14(6):793-803.


Construction of a derivative of Agrobacterium tumefaciens C58 that does not mutate to tetracycline resistance.

Luo ZQ, Clemente TE, Farrand SK.

Mol Plant Microbe Interact. 2001 Jan;14(1):98-103.


A second T-region of the soybean-supervirulent chrysopine-type Ti plasmid pTiChry5, and construction of a fully disarmed vir helper plasmid.

Palanichelvam K, Oger P, Clough SJ, Cha C, Bent AF, Farrand SK.

Mol Plant Microbe Interact. 2000 Oct;13(10):1081-91.


Renaming protein secretion in the gram-negative bacteria.

Henderson IR, Nataro JP, Kaper JB, Meyer TF, Farrand SK, Burns DL, Finlay BB, St Geme JW 3rd.

Trends Microbiol. 2000 Aug;8(8):352. No abstract available.


Quorum-sensing signal binding results in dimerization of TraR and its release from membranes into the cytoplasm.

Qin Y, Luo ZQ, Smyth AJ, Gao P, Beck von Bodman S, Farrand SK.

EMBO J. 2000 Oct 2;19(19):5212-21.


Renaming protein secretion in the gram-negative bacteria

Henderson IR, Nataro JP, Kaper JB, Meyer TF, Farrand SK, Burns DL, Finlay BB, St Geme JW 3rd.

Trends Microbiol. 2000 Aug;8(8):352. No abstract available.


The bases of crown gall tumorigenesis.

Zhu J, Oger PM, Schrammeijer B, Hooykaas PJ, Farrand SK, Winans SC.

J Bacteriol. 2000 Jul;182(14):3885-95. Review. No abstract available.


TraG from RP4 and TraG and VirD4 from Ti plasmids confer relaxosome specificity to the conjugal transfer system of pTiC58.

Hamilton CM, Lee H, Li PL, Cook DM, Piper KR, von Bodman SB, Lanka E, Ream W, Farrand SK.

J Bacteriol. 2000 Mar;182(6):1541-8.


High-efficiency induction of soybean hairy roots and propagation of the soybean cyst nematode.

Cho HJ, Farrand SK, Noel GR, Widholm JM.

Planta. 2000 Jan;210(2):195-204.


Essential components of the Ti plasmid trb system, a type IV macromolecular transporter.

Li PL, Hwang I, Miyagi H, True H, Farrand SK.

J Bacteriol. 1999 Aug;181(16):5033-41.


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