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Type A receptors of γ-aminobutyric acid (GABA), an inhibitory neurotransmitter, contain α, β, δ, γ, and ρ subunits. The γ subunit has four subtypes: γ1, γ2, γ3, andγ4. GABA A receptor-associated protein (GABARAP) was previously demonstrated to act as a linker protein between microtubules and the γ2 subunit of GABA A receptors. However, no other linker proteins have been identified...
Maintenance of different organelles in eukaryotic cells depends on sorting proteins, which ensure the proper delivery of organelle-specific proteins. The studies on yeast (Saccharomyces cerevisiae) VPS35, a hydrophilic membrane protein having a direct role in the retrieval of cargo proteins, suggest a mechanism underlying a possible lysosomal protein-sorting pathway in mammalian cells. Here, we report...
DEAD-box proteins are a large group of putative RNA helicases that exist ubiquitously in organisms ranging from bacteria to humans. They are likely to play important roles in many different RNA metabolic processes. In this paper, we report the cloning of human DDX24, a putative DEAD-box protein, and its ortholog, Ddx24 in mouse. The deduced proteins encoded by these two cDNAs share 78.7% identity...
Protein phosphatase 2A (PP2A) is one kind of serine/threonine protein phosphatase regulating mainly cell growth and division. It comprises three subunits, A, B, and C. The B-subunit is involved in enzyme activity and substrate specificity. The B-subunit family is of great diversity and is divided into three classes, the B1, B2, and B3 subfamilies. Until now, two members of the B1 subfamily, B1α and...
The Rho proteins are a class of small molecular GTPases that regulate multiple fundamental cellular processes by mediating the G-protein-coupled receptor signaling pathway. Rhotekin, which is one of the downstream target molecules of Rho with a Rho binding motif class I domain, can inhibit endogenous or RhoGAP-stimulating Rho GTPase activity to regulate the signaling pathway. Here, a novel human cDNA...
A novel cDNA encoding a putative Ser/Thr protein kinase was isolated from a human skeletal muscle cDNA library. It contains an open reading frame that extends from nt 104 to 1510 and codes for a protein of 469 amino acids. A catalytic domain containing the conserved residues of the Ser/Thr protein kinase, especially human ribosome protein S6 kinase (RSK), was found to be located in the C-terminal...
The Dhm1 gene is the mouse homologue of the dhp1 + gene of Schizosaccharomyces pombe, which is involved in homologous recombination and RNA metabolism, such as RNA synthesis and RNA trafficking, in S. pombe. Complementation analysis showed the Dhm1 gene on a multicopy plasmid can rescue the temperature-sensitivity mutation of dhp1 ts and the lethality of the dhp1 null mutation. This...
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