Insight into the structure, function and conjugative transfer of pLPU83a, an accessory plasmid of Rhizobium favelukesii LPU83.

08:00 EDT 27th March 2019 | BioPortfolio

Summary of "Insight into the structure, function and conjugative transfer of pLPU83a, an accessory plasmid of Rhizobium favelukesii LPU83."

Plasmids are widely distributed in rhizobia, a group of bacteria able to establish symbiotic relationships with the roots of legume plants. Two types of conjugative transfer (CT) regulation of these elements have been described in more detail. The most prevalent is through Quorum-Sensing (QS), mediated by the interaction of the TraR regulator protein and its cognate acyl-homoserine lactone (AHL) synthesized by TraI. In this study, we analyzed rhizobial plasmids classified according to their TraR regulators into four different groups. Each group has a particular genomic architecture. In one of the groups (I-C), represented by pLPU83a from Rhizobium favelukesii LPU83, CT induction requires TraR. With manual annotation, a traI was located in the plasmid distant to the traR gene. These features make pLPU83a an interesting plasmid for studying novel mechanisms of CT regulation. We mutagenized the traI gene, and found that it does not participate in CT regulation. Furthermore, we studied whether pLPU83a is subject to QS regulation by determining CT at different growth stages (cell densities). Our results showed no positive correlation between increase in cultures densities and CT induction, on the contrary a slight decrease in CT was found at higher culture densities, unlike other TraR-depending plasmids. Our results show that transfer of pLPU83a is not regulated in a QS-dependent manner, and suggest that molecules not yet identified may activate its CT. Also, accumulation of a putative inhibitor cannot be disregarded.


Journal Details

This article was published in the following journal.

Name: Plasmid
ISSN: 1095-9890


DeepDyve research library

PubMed Articles [18595 Associated PubMed Articles listed on BioPortfolio]

Reconstruction of the spinal accessory nerve with selective fascicular nerve transfer of the upper trunk.

Spinal accessory nerve palsy is frequently caused by iatrogenic damage during neck surgery in the posterior triangle of the neck. Due to late presentation, treatment regularly necessitates nerve graft...

Antibiotic-resistance gene transfer in antibiotic-resistance bacteria under different light irradiation: Implications from oxidative stress and gene expression.

Due to the significant public health risks, there is substantial scientific interest in the increasing abundance of antibiotic-resistance bacteria (ARB) and the spread of antibiotic-resistance genes (...

Antibiotic resistant bacteria survived from UV disinfection: Safety concerns on genes dissemination.

Antibiotic resistant bacteria (ARB) and antibiotic resistance genes (ARGs) are the emerging contaminants leading to a serious worldwide health problem. Although disinfection like ultraviolet (UV) irra...

Conjugative and replicative biology of the Staphylococcus aureus antimicrobial resistance plasmid, pC02.

Genetic transfer among bacteria propels rapid resistance to antibiotics and decreased susceptibility to antiseptics. Staphylococcus aureus is a common culprit of hospital and community acquired infect...

pXO16, the large conjugative plasmid from Bacillus thuringiensis serovar israelensis displays an extended host spectrum.

pXO16, the large conjugative plasmid from Bacillus thuringiensis serovar israelensis is able to efficient self-transfer, to mobilize and retro-mobilize non-conjugative plasmids, including "non-mobiliz...

Clinical Trials [5067 Associated Clinical Trials listed on BioPortfolio]

New Non-invasive Modalities for Assessing Retinal Structure and Function

This study investigates a new technology to assess the structure and function inside the eye. Retinal imaging of subjects with inner and outer retinal defects to detect areas of abnormal s...

Effects of Treprostinil on Right Ventricular Structure and Function in Patients With Pulmonary Arterial Hypertension

In a group of patients with PAH treated with treprostinil, the current study aims to investigate the effect of treatment on RV structure and function; and correlate changes in RV structure...

Does the Embryo Transfer Technique Affect the Success of in Vitro Fertilization?

Prospective, open, randomized, parallel, two-arm trial to compare the clinical pregnancy rate between most commonly used two embryo transfer techniques: trial followed by transfer techniqu...

Effects of Maternal Body Composition on Offspring Brain Structure and Function

The specific aim of this study is to use MRI methods to evaluate and compare brain structure and function in two groups of full-term neonates at two-weeks of age: those born of obese mothe...

Effects of Bariatric Surgery on Cardiac and Vascular Structure and Function in Obesity

This is a prospective cohort study which aims to explore the effect of bariatric surgery on cardiac and vascular structure and function in obesity. Enrolled patients will receive the follo...

Medical and Biotech [MESH] Definitions

A large family of regulatory proteins that function as accessory subunits to a variety of CYCLIN-DEPENDENT KINASES. They generally function as ENZYME ACTIVATORS that drive the CELL CYCLE through transitions between phases. A subset of cyclins may also function as transcriptional regulators.

Filamentous or elongated proteinaceous structures which extend from the cell surface in gram-negative bacteria that contain certain types of conjugative plasmid. These pili are the organs associated with genetic transfer and have essential roles in conjugation. Normally, only one or a few pili occur on a given donor cell. (From Singleton & Sainsbury, Dictionary of Microbiology and Molecular Biology, 2d ed, p675) This preferred use of "pili" refers to the sexual appendage, to be distinguished from bacterial fimbriae (FIMBRIAE, BACTERIAL), also known as common pili, which are usually concerned with adhesion.

The small RNA molecules, 73-80 nucleotides long, that function during translation (TRANSLATION, GENETIC) to align AMINO ACIDS at the RIBOSOMES in a sequence determined by the mRNA (RNA, MESSENGER). There are about 30 different transfer RNAs. Each recognizes a specific CODON set on the mRNA through its own ANTICODON and as aminoacyl tRNAs (RNA, TRANSFER, AMINO ACYL), each carries a specific amino acid to the ribosome to add to the elongating peptide chains.

RNA which does not code for protein but has some enzymatic, structural or regulatory function. Although ribosomal RNA; (RNA, RIBOSOMAL) and transfer RNA; (RNA, TRANSFER) are also untranslated they are not included here.

Body of knowledge related to the use of organisms, cells or cell-derived constituents for the purpose of developing products which are technically, scientifically and clinically useful. Alteration of biologic function at the molecular level (i.e., GENETIC ENGINEERING) is a central focus; laboratory methods used include TRANSFECTION and CLONING technologies, sequence and structure analysis algorithms, computer databases, and gene and protein structure function analysis and prediction.

Quick Search


DeepDyve research library

Relevant Topic

Within medicine, nutrition (the study of food and the effect of its components on the body) has many different roles. Appropriate nutrition can help prevent certain diseases, or treat others. In critically ill patients, artificial feeding by tubes need t...

Searches Linking to this Article