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Quorum Sensing Coordinates Brute Force and Stealth Modes of Infection in the Plant Pathogen Pectobacterium atrosepticum

Quorum sensing (QS) in vitro controls production of plant cell wall degrading enzymes (PCWDEs) and other virulence factors in the soft rotting enterobacterial plant pathogen Pectobacterium atrosepticum (Pba). Here, we demonstrate the genome-wide regulatory role of QS in vivo during the Pba–potato interaction, using a Pba-specific microarray. We show that 26% of the Pba genome...

New quadruplex structure of GGA triplet repeat DNA—An intramolecular quadruplex composed of a G:G:G:G tetrad and G(:A):G(:A):G(:A):G heptad, and its dimerization—

The structure of d(GGAGGAGGAGGA) containing four tandem repeats of a GGA triplet sequence has been determined under physiological K+ conditions by NMR. d(GGAGGAGGAGGA) folds into an intramolecular quadruplex composed of a G:G:G:G tetrad and a G(:A):G(:A):G(:A):G heptad. Four G-G segments of d(GGAGGAGGAGGA) are aligned parallel to each other due to seven successive turns of the...

Orexin A Preferentially Excites Glucose-Sensitive Neurons in the Lateral Hypothalamus of the Rat In Vitro

Falls in blood glucose induce hunger and initiate feeding. The lateral hypothalamic area (LHA) contains glucose-sensitive neurons (GSNs) and orexin neurons, both of which are stimulated by falling blood glucose and are implicated in hypoglycemia-induced feeding. We combined intracellular electrophysiological recording with fluorescein labeling of GSNs to determine their...

NMR study of a novel RNA quadruplex structure

The structure of an RNA oligomer, r(GGAGGUUUUGGAGG) (R14-2) whose G-G steps are separated by adenine and uracil residues has been investigated by NMR. In the presence of 20 mM K+, a novel dimeric multiplex architecture is adopted by two strands of R14-2. In each strand a UUUU loop and two A residues connect four parallel G-G steps that pair-align into two tetrads. One of the...

Reconstruction of mouse oocytes by germinal vesicle transfer: maturity of host oocyte cytoplasm determines meiosis

We evaluated the maturational competence of mouse oocytes reconstructed by the transfer and electrofusion of germinal vesicles (GV) into anuclear cytoplasts of GV stage oocytes (both auto- and hetero-transfers), metaphase II stage oocytes or zygotes. Following in-vitro culture, the maturation rates of the reconstructed oocytes to metaphase II did not significantly differ between...

SabA Is the H. pylori Hemagglutinin and Is Polymorphic in Binding to Sialylated Glycans

Adherence of Helicobacter pylori to inflamed gastric mucosa is dependent on the sialic acid–binding adhesin (SabA) and cognate sialylated/fucosylated glycans on the host cell surface. By in situ hybridization, H. pylori bacteria were observed in close association with erythrocytes in capillaries and post-capillary venules of the lamina propria of gastric mucosa in both infected...

Risk Factors for Skin and Soft-Tissue Abscesses among Injection Drug Users: A Case-Control Study

Skin and soft-tissue abscesses, a common problem among injection drug users (IDUs), result in serious morbidity for the patient and costly hospitalizations for incision and drainage; however, there has been little etiologic or preventive epidemiologic research on this problem. We performed a case-control study that enrolled 151 IDUs who had been given a new diagnosis of abscess...

Functional studies of BCL11A: characterization of the conserved BCL11A-XL splice variant and its interaction with BCL6 in nuclear paraspeckles of germinal center B cells

Background Chromosomal aberrations of BCL11A at 2p16.1 have been reported in a variety of B-cell malignancies and its deficiency in mice leads to a profound block in B-cell development. Results Alternative pre-mRNA splicing of BCL11A produces multiple isoforms sharing a common N-terminus. The most abundant isoform we have identified in human lymphoid samples is BCL11A-XL, the...

Streptolysin O-permeabilized cell system for studying trans-acting activities of exogenous nuclear proteins

Efficient transfer of exogenous proteins into culture animal cells can be achieved by Streptolysin O (SLO) permeabilization of plasma membranes. We used this method to establish an In vitro transcription system for early response genes. The promoters of many early response genes contain an essential DNA motif known as the Serum Response Element (SRE). Recent data has shown that...

Overview of BioCreative II gene normalization

decrease recall. Team 101 (Heng-hui Liu, National Cheng Kung University) The system [35] consisted of two major components. The first component recognized candidate gene mentions in text, and then matched ... Lu, Aaron Cohen, Patrick Ruch, Anna Divoli, Katrin Fundel, Robert Leaman, Jrg Hakenberg, Chenjie Sun, Heng-hui Liu, Michael Krauthammer, William Lau, Hongfang Liu, ChunNan Hsu, K. Bretonnel Cohen, and

Posttranscriptional modification of transfer RNA in the submarine hyperthermophile Pyrolobus fumarii

In the RNA of hyperthermophiles, which grow optimally between 80°C and 106°C, posttranscriptional modification has been identified as a leading mechanism of structural stabilization. Particularly in the Archaeal evolutionary domain these modifications are expressed as a structurally diverse array of modification motifs, many of which include ribose methylation. Using mass...

Microwave enhanced akabori reaction for peptide analysis

The Akabori reaction, devised in 1952 for the identification of C-terminus amino acids, involves the heating of a linear peptide in the presence of anhydrous hydrazine in a sealed tube for several hours. We report here a modified Akabori reaction that rapidly identifies the C-terminus amino acid in a polypeptide including its amino acid sequence information at both the C-terminus...