Heterotrimeric G proteins are key intracellular coordinators that receive signals from cells through activation of cognate G protein-coupled receptors (GPCRs). The details of their atomic interactions and structural mechanisms have been described by many biochemical and biophysical studies. Specifically, a framework for understanding conformational changes in the receptor upon ligand binding and associated G protein activation was provided by description of the crystal structure of the β2-adrenoceptor-Gs complex in 2011. This review focused on recent findings in the conformational dynamics of G proteins and GPCRs during activation processes.
GTP-Binding Proteins* ; Heterotrimeric GTP-Binding Proteins

No abstract available.
GTP-Binding Proteins*

BACKGROUNDAlthough biomedical ontologies have standardized the representation of gene products across species and databases, a method for determining the functional similarities of gene products has not yet been developed.

METHODSWe proposed a new semantic similarity measure based on Gene Ontology that considers the semantic influences from all of the ancestor terms in a graph. Our measure was compared with Resnik's measure in two applications, which were based on the association of the measure used with the gene co-expression and the protein-protein interactions.

RESULTSThe results showed a considerable association between the semantic similarity and the expression correlation and between the semantic similarity and the protein-protein interactions, and our measure performed the best overall.

CONCLUSIONThese results revealed the potential value of our newly proposed semantic similarity measure in studying the functional relevance of gene products.

No abstract available.
GTP-Binding Proteins

Membrane Proteins/metabolism* ; Protein Binding

No Abstract Available.
GTP-Binding Proteins* ; Receptors, Cell Surface*

No abstract available.
Binding Sites* ; Gonadotropins* ; Humans* ; Ovarian Neoplasms*

The paraneoplastic neurologic diseases (PNDs) are brain degenerations that develop in the setting of clinically inapparent cancers. PNDs arise when common cancers express brain proteins, triggering an anti-tumor immune response and tumor immunity. Research on these brain-cancer proteins has revealed a new world of neuron-specific RNA binding proteins whose functions may be aberrantly used by tumor cells. Efforts to gain insight into their function has led to the development of new methods and strategies to understand RNA protein regulation in living tissues.
Brain ; Proteins ; RNA ; RNA-Binding Proteins

Background: Anemia in patients with liver cirrhosis can be due to either iron deficiency as the result of gastroesophageal bleeding or vitamin B12 and folic acid deficiency in patients with alcohol - induced liver cirrhosis. Nevertheless excessive iron level in liver can induce damages to hepatic cells and further advance the cirrhosis process. Objective: To investigate the function of iron in the treatment of anemia in liver cirrhosis patients, collecting data on plasma iron and ferritin concentrations. Subjects and method: Research on 100 patients with liver cirrhosis has been conducted at Department of Gastroenterology, Bach Mai Hospital. Results: 59% patients had low plasma iron level and 9% had high level whereas 13% and 61 % patients had low and high plasma ferritin levels respectively. Plasma iron levels reduced significantly at patients with liver cirrhosis at advanced stage (p < 0.01) and at patients with gastroesophageal (GE) haemorrhage (p < 0.05). Plasma ferritin levels reduced in patients with gastroesophageal bleeding (p < 0.05) but increased in patients with liver cirrhosis at advanced stage (p <0.01) and at alcohol - induced liver cirrhosis patients (p < 0.05). Conclusions: For patients having chronic anemia, plasma levels of iron and ferritin should be determined before a decision of prescribing iron being made.
Fibrosis ; Iron ; iron-binding seminal plasma antigen

Humans ; Telomere ; metabolism ; Telomere-Binding Proteins ; metabolism