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EcbI and EcbR: homologs of LuxI and LuxR affecting antibiotic and exoenzyme production by Erwinia carotovora subsp. betavasculorum.
Can J Microbiol. 1997 Dec; 43(12):1164-71.CJ

Abstract

Erwinia carotovora subsp. betavasculorum Ecb168 causes vascular necrosis and root rot of sugar beet and produces an antibiotic(s) that is antagonistic against other Erwinia spp. EcbI- mutants of Ecb168, each containing a single transposon insertion in the ecbI gene (for Erwinia carotovora subsp. betavasculorum inducer), do not produce detectable levels of extracellular protease or antibiotic(s), and express less pectate lyase activity and virulence than the wild-type strain. A plasmid containing the cloned ecbI gene complemented the EcbI- mutants for these phenotypes. Protease production by EcbI- mutants grown on agar surfaces was restored by neighboring cells of Escherichia coli containing ecbI. Production of a diffusible N-acylhomoserine lactone autoinducer by wild-type Ecb168 was detected with indicator strains of E. coli and Agrobacterium tumefaciens. EcbI- mutant strains did not produce an autoinducer detected by the indicator strains. Antibiotic production by EcbI- mutants was restored by cell-free culture supernatants of Ecb168 or E. coli containing a cloned ecbI gene. The predicted amino acid sequence of EcbI is similar to those of CarI, ExpI, and HsII, three LuxI homologs required for production of a diffusible N-acylhomoserine lactone autoinducer in Erwinia carotovora subsp. carotovora. A luxR homolog, termed ecbR (for Erwinia carotovora subsp. betavasculorum regulator), is convergently transcribed and overlaps with ecbI by 17 bp at their 3' ends. These results are consistent with the hypothesis that a quorum-sensing system related to the prototypic luxI-luxR gene pair controls antibiotic and exoenzyme production in Erwinia carotovora subsp. betavasculorum.

Authors+Show Affiliations

United States Department of Agriculture, Agricultural Research Service, Horticultural Crops Research Laboratory, Corvallis, OR 97330, USA.No affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, U.S. Gov't, Non-P.H.S.

Language

eng

PubMed ID

9476353

Citation

Costa, J M., and J E. Loper. "EcbI and EcbR: Homologs of LuxI and LuxR Affecting Antibiotic and Exoenzyme Production By Erwinia Carotovora Subsp. Betavasculorum." Canadian Journal of Microbiology, vol. 43, no. 12, 1997, pp. 1164-71.
Costa JM, Loper JE. EcbI and EcbR: homologs of LuxI and LuxR affecting antibiotic and exoenzyme production by Erwinia carotovora subsp. betavasculorum. Can J Microbiol. 1997;43(12):1164-71.
Costa, J. M., & Loper, J. E. (1997). EcbI and EcbR: homologs of LuxI and LuxR affecting antibiotic and exoenzyme production by Erwinia carotovora subsp. betavasculorum. Canadian Journal of Microbiology, 43(12), 1164-71.
Costa JM, Loper JE. EcbI and EcbR: Homologs of LuxI and LuxR Affecting Antibiotic and Exoenzyme Production By Erwinia Carotovora Subsp. Betavasculorum. Can J Microbiol. 1997;43(12):1164-71. PubMed PMID: 9476353.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - EcbI and EcbR: homologs of LuxI and LuxR affecting antibiotic and exoenzyme production by Erwinia carotovora subsp. betavasculorum. AU - Costa,J M, AU - Loper,J E, PY - 1998/2/26/pubmed PY - 1998/2/26/medline PY - 1998/2/26/entrez SP - 1164 EP - 71 JF - Canadian journal of microbiology JO - Can J Microbiol VL - 43 IS - 12 N2 - Erwinia carotovora subsp. betavasculorum Ecb168 causes vascular necrosis and root rot of sugar beet and produces an antibiotic(s) that is antagonistic against other Erwinia spp. EcbI- mutants of Ecb168, each containing a single transposon insertion in the ecbI gene (for Erwinia carotovora subsp. betavasculorum inducer), do not produce detectable levels of extracellular protease or antibiotic(s), and express less pectate lyase activity and virulence than the wild-type strain. A plasmid containing the cloned ecbI gene complemented the EcbI- mutants for these phenotypes. Protease production by EcbI- mutants grown on agar surfaces was restored by neighboring cells of Escherichia coli containing ecbI. Production of a diffusible N-acylhomoserine lactone autoinducer by wild-type Ecb168 was detected with indicator strains of E. coli and Agrobacterium tumefaciens. EcbI- mutant strains did not produce an autoinducer detected by the indicator strains. Antibiotic production by EcbI- mutants was restored by cell-free culture supernatants of Ecb168 or E. coli containing a cloned ecbI gene. The predicted amino acid sequence of EcbI is similar to those of CarI, ExpI, and HsII, three LuxI homologs required for production of a diffusible N-acylhomoserine lactone autoinducer in Erwinia carotovora subsp. carotovora. A luxR homolog, termed ecbR (for Erwinia carotovora subsp. betavasculorum regulator), is convergently transcribed and overlaps with ecbI by 17 bp at their 3' ends. These results are consistent with the hypothesis that a quorum-sensing system related to the prototypic luxI-luxR gene pair controls antibiotic and exoenzyme production in Erwinia carotovora subsp. betavasculorum. SN - 0008-4166 UR - https://www.unboundmedicine.com/medline/citation/9476353/EcbI_and_EcbR:_homologs_of_LuxI_and_LuxR_affecting_antibiotic_and_exoenzyme_production_by_Erwinia_carotovora_subsp__betavasculorum_ L2 - https://cdnsciencepub.com/doi/10.1139/m97-165?url_ver=Z39.88-2003&rfr_id=ori:rid:crossref.org&rfr_dat=cr_pub=pubmed DB - PRIME DP - Unbound Medicine ER -