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156 Newest Publications of Portland Press

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Thiol-disulfide exchange between the PDI family of oxidoreductases negates the requirement for an oxidase or reductase for each enzyme

19-May-2015 | Oka O; Yeoh H; Bulleid N, Biochemical Journal, 2015

The formation of disulfides in proteins entering the secretory pathway is catalysed by the protein disulfide isomerase family of enzymes. These enzymes catalyse the introduction, reduction and isomerisation of disulfides. To function continuously they require an oxidase to reform the disulfide at ...


Slc5a8, a Na {+} -coupled high-affinity transporter for short-chain fatty acids, is a conditional tumor suppressor in colon that protects against colitis and colon cancer under low-fiber dietary conditions

18-May-2015 | Gurav A; Sivaprakasam S; Bhutia Y; Boettger T; Singh N; Ganapathy V, Biochemical Journal, 2015

Mammalian colon harbors trillions of bacteria under physiologic conditions; this symbiosis is made possible because of a tolerized response from the mucosal immune system. The mechanisms underlying this tolerogenic phenomenon remain poorly understood. Here we show that Slc5a8, a Na + -coupled ...


The purification and characterization of ATP synthase complexes from the mitochondria of four fungal species

15-May-2015 | Liu S; Charlesworth TJ; Bason JV; Montgomery MG; Harbour ME; Fearnley IM; Walker JE, Biochemical Journal, 2015

The ATP synthases have been isolated by affinity chromatography from the mitochondria of the fungal species Yarrowia lipolytica, Pichia pastoris, Pichia angusta and Saccharomyces cerevisiae. The subunit compositions of the purified enzyme complexes depended on the detergent used to solubilize and ...


Acyl-CoA Binding Domain Containing 3 Modulates NAD{+} Metabolism through Activating Poly(ADP-ribose) Polymerase 1

05-May-2015 | Chen Y; Bang S; Park S; Shi H; Kim S, Biochemical Journal, 2015

Nicotinadmide adenine dinucleotide (NAD+) plays essential roles in cellular energy homeostasis and redox state functioning as a cofactor along the glycolysis and citric acid cycle pathways. Recent discoveries indicated that, through the NAD+-consuming enzymes, this molecule may be also involved ...


Structural and biochemical characterization of novel bacterial {alpha}-galactosidases belonging to glycoside hydrolase family 31

05-May-2015 | Miyazaki T; Ishizaki Y; Ichikawa M; Nishikawa A; Tonozuka T, Biochemical Journal, 2015

Glycoside hydrolase family 31 (GH31) proteins have been reportedly identified as exo-α-glycosidases with activity for α-glucosides and α-xylosides. We focused on a GH31 subfamily, which contains proteins with low sequence identity (8-barrel fold that resembles the structures of other GH31 ...


Targeting Cullin-RING E3 ubiquitin ligases for drug discovery: structure, assembly and small-molecule modulation

01-May-2015 | Bulatov E; Ciulli A, Biochemical Journal, 2015

In the last decade, the ubiquitin-proteasome system has emerged as a valid target for the development of novel therapeutics. E3 ubiquitin ligases are particularly attractive targets because they confer substrate specificity on the ubiquitin system. CRLs [Cullin-RING (really interesting new gene) ...


Proteomic approaches to identify substrates of the three Deg/HtrA proteases of the cyanobacterium {Less than}i{Greater than}Synechocystis{Less than}/i{Greater than} sp. PCC 6803

16-Apr-2015 | Tam L; Aigner H; Timmerman E; Gevaert K; Funk C, Biochemical Journal, 2015

The family of Deg/HtrA proteases plays an important role in quality control of cellular proteins in a wide range of organisms. In the genome of the cyanobacterium Synechocystis sp. PCC 6803, a model organism for photosynthetic research and renewable energy products, three Deg proteases are ...


Cofactor specificity motifs and the induced fit mechanism in Class I ketol-acid reductoisomerases

07-Apr-2015 | Cahn J; Brinkmann-Chen S; Spatzal T; Wiig J; Buller A; Einsle O; Hu Y; Ribbe M; Arnold F, Biochemical Journal, 2015

Although most sequenced members of the industrially important ketol-acid reductoisomerase (KARI) family are Class I enzymes, structural studies to date have focused primarily on the Class II KARIs, which arose through domain duplication. Here, we present five new crystal structures of Class I ...


Processing of Protein ADP-ribosylation by Nudix Hydrolases

19-Mar-2015 | Palazzo L; Thomas B; Jemth A; Colby T; Leidecker O; Feijs K; Zaja R; Loseva O; Puigvert J; Matic I; Helleday T; Ahel I, Biochemical Journal, 2015

ADP-ribosylation is a post-translational modification of proteins found in organisms from all kingdoms of life which regulates many important biological functions including DNA repair, chromatin structure, unfolded protein response, and apoptosis. Several cellular enzymes, such as macrodomain ...


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

15-Mar-2015 | Bett JS; Ritorto MS; Ewan R; Jaffray EG; Virdee S; Chin JW; Knebel A; Kurz T; Trost M; Tatham MH; Hay RT, Biochemical Journal, 2015

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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