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1,804 Newest Publications of Portland Press

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Comparisons of subunit 5A and 5B isoenzymes of yeast cytochrome c oxidase

15-12-2014 | Dodia R; Meunier B; Kay CWM; Rich PR, Biochemical Journal, 2014

Subunit 5 of Saccharomyces cerevisiae cytochrome c oxidase (CcO) is essential for assembly and has two isoforms, 5A and 5B. 5A is expressed under normoxic conditions, whereas 5B is expressed at very low oxygen tensions. As a consequence, COX5A-deleted strains (Δcox5A) have no or only low levels ...

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A context-independent N-glycan signal targets the misfolded extracellular domain of Arabidopsis STRUBBELIG to endoplasmic-reticulum-associated degradation

15-12-2014 | Huttner S; Veit C; Vavra U; Schoberer J; Dicker M; Maresch D; Altmann F; Strasser R, Biochemical Journal, 2014

N-glycosylation of proteins plays an important role in the determination of the fate of newly synthesized glycoproteins in the endoplasmic reticulum (ER). Specific oligosaccharide structures recruit molecular chaperones that promote folding or mannose-binding lectins that assist in the clearance ...

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Structural and functional consequences of removing the N-terminal domain from the magnesium chelatase ChlH subunit of Thermosynechococcus elongatus

15-12-2014 | Adams NBP; Marklew CJ; Qian P; Brindley AA; Davison PA; Bullough PA; Hunter CN, Biochemical Journal, 2014

Magnesium chelatase (MgCH) initiates chlorophyll biosynthesis by catalysing the ATP-dependent insertion of Mg2+ into protoporphyrin. This large enzyme complex comprises ChlH, I and D subunits, with I and D involved in ATP hydrolysis, and H the protein that handles the substrate and product. The ...

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TREHALOSE-6-PHOSPHATE SYNTHASE 1 is not the only active TPS in {Less than}i{Greater than}Arabidopsis thaliana.{Less than}/i{Greater than}

12-12-2014 | Delorge I; Figueroa C; Feil R; Lunn J; Van Dijck P, Biochemical Journal, 2014

Trehalose metabolism is essential for normal growth and development in higher plants. It is synthesized in a two-step pathway catalyzed by trehalose-6-phosphate (Tre6P) synthase (TPS) and trehalose phosphatase. Arabidopsis thaliana has 11 TPS or TPS-like proteins, which belong to two distinct ...

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The function of phosphatidylinositol 5-phosphate 4-kinase {gamma}(PI5P4K{gamma}) explored using a specific inhibitor that targets the PI5P binding site.

11-12-2014 | Clarke J; Giudici M; Burke J; Williams R; Maloney D; Marugan J; Irvine R, Biochemical Journal, 2014

NIH-12848 (NCGC00012848-02), a putative phosphatidylinositol-5-phosphate 4-kinase γ (PI5P4Kγ) inhibitor, was explored as a tool for investigating this enigmatic, low activity, lipid kinase. PI5P 4-kinase assays in vitro showed that NIH-12848 inhibited PI5P4Kγ with an IC50 of approximately 1μM but ...

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TARP {gamma}-8 glycosylation regulates the surface expression of AMPA receptors

11-12-2014 | Zheng C; Chang K; Suh Y; Roche K, Biochemical Journal, 2014

Transmembrane AMPA receptor regulatory protein (TARP) γ-8 is an auxiliary subunit of AMPA receptors that is widely distributed in the hippocampus. It has been shown that TARP γ-8 promotes surface expression of AMPA receptors; however, how TARP γ-8 regulates the expression of AMPA receptors ...

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The regulatory role of {Less than}i{Greater than}Streptomyces coelicolor{Less than}/i{Greater than} TamR in central metabolism

11-12-2014 | Huang H; Sivapragasam S; Grove A, Biochemical Journal, 2014

Trans-aconitate methyltransferase regulator (TamR) is a member of the ligand-responsive multiple antibiotic resistance regulator (MarR) family of transcription factors. In Streptomyces coelicolor, TamR regulates transcription of tamR (encoding TamR), tam (encoding trans-aconitate ...

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Catalytic surface radical in dye-decolorizing peroxidase: A computational, spectroscopic and site-directed mutagenesis study

11-12-2014 | Linde D; Pogni R; Canellas M; Lucas F; Guallar V; Baratto M; Sinicropi A; S{a}ez-jim{e}nez V; Coscolin C; Romero A; ..., Biochemical Journal, 2014

Dye-decolorizing peroxidase (DyP) of Auricularia auricula-judae has been expressed in E. coli, as a representative for new DyP family, and subjected to mutagenesis, spectroscopic, crystallographic and computational studies. The crystal structure of DyP shows a buried haem cofactor, and surface ...

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Ubiquitin-C-terminal hydrolases cleave isopeptide and peptide-linked ubiquitin from structured proteins but do not edit ubiquitin homopolymers

09-12-2014 | Bett J; Ritorto M; Ewan R; Jaffray E; Virdee S; Chin J; Knebel A; Kurz T; Trost M; Tatham M; Hay R, Biochemical Journal, 2014

Modification of proteins with ubiquitin (Ub) occurs through a variety of topologically distinct Ub linkages, including Ube2W-mediated monoubiquitylation of N-terminal alpha amines to generate peptide-linked linear mono-Ub fusions. Protein ubiquitylation can be reversed by the action of ...

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Kinetic Characterization of a Cocaine Hydrolase Engineered from Mouse Butyrylcholinesterase

08-12-2014 | Chen X; Huang X; Geng L; Xue L; Hou S; Zheng X; Brimijoin S; Zheng F; Zhan C, Biochemical Journal, 2014

Mouse butyrylcholinesterase (mBChE) and an mBChE-based cocaine hydrolase (mCocH, i.e. the A199S/S227A/S287G/A328W/Y332G mutant) have been characterized for their catalytic activities against cocaine, i.e. naturally occurring (-)-cocaine, in comparison with the corresponding human BChE (hBChE) and ...

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