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1,775 Newest Publications of Portland Press

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Iron alters cell survival in a mitochondria-dependent pathway in ovarian cancer cells

01-Mar-2015 | Bauckman K; Haller E; Taran N; Rockfield S; Ruiz-Rivera A; Nanjundan M, Biochemical Journal, 2015

The role of iron in the development of cancer remains unclear. We previously reported that iron reduces cell survival in a Ras/mitogen-activated protein kinase (MAPK)-dependent manner in ovarian cells; however, the underlying downstream pathway leading to reduced survival was unclear. Although ...

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Notch ligand Delta-like1: X-ray crystal structure and binding affinity

26-Feb-2015 | Kershaw N; Church N; Griffin M; Luo C; Adams T; Burgess A, Biochemical Journal, 2015

The Notch pathway is a fundamental signalling system in most multicellular animals. We have determined the X-ray crystal structure of the extracellular domain of the Notch ligand Delta-like ligand-1 (Dll-1). This is the first structure of a Delta-like ligand. The structure incorporates the ...

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Distinct lipid effects on tBid and Bim activation of membrane permeabilization by pro-apoptotic Bax

25-Feb-2015 | Shamas-Din A; Bindner S; Chi X; Leber B; Andrews D; Fradin C, Biochemical Journal, 2015

After exposure to stressful stimuli, apoptotic signals can be relayed to mitochondria by pro-apoptotic activator proteins, tBid and Bim, which activate Bax and or Bak to induce mitochondrial outer membrane permeabilization (MOMP). These protein-protein and protein-membrane interactions are ...

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PAQR3 modulates H3K4 trimethylation by spatial modulation of the regulatory subunits of COMPASS-like complexes in mammalian cells

23-Feb-2015 | Liu C; Zhang Y; Hou Y; Shen L; Li Y; Guo W; Xu D; Liu G; Zhao Z; Man K; Pan Y; Wang Z; Chen Y, Biochemical Journal, 2015

Histone modification plays important roles in many biological processes such as development and carcinogenesis. Methylation of histone H3 lysine 4 (H3K4) is commonly associated with transcriptional activation of genes. H3K4 methylation in mammalian cells is carried out by COMPASS-like complexes ...

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Structural Mechanisms Underlying Sequence-Dependent Variations in GAG Affinities of Decorin Binding Protein A, a {Less than}i{Greater than}Borrelia burgdorferi{Less than}/i{Greater than} Adhesin

19-Feb-2015 | Morgan A; Wang X, Biochemical Journal, 2015

Decorin binding protein A (DBPA) is an important surface adhesin of the bacterium Borrelia burgdorferi, the causative agent of Lyme disease. DBPA facilitates the bacteria’s colonization of human tissue by adhering to glycosaminoglycan (GAG), a sulfated polysaccharide. Interestingly, DBPA sequence ...

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PT-1 selectively activates AMPK-{gamma}1 complexes in mouse skeletal muscle, but activates all three {gamma} subunit complexes in cultured human cells by inhibiting the respiratory chain

19-Feb-2015 | Jensen T; Ross F; Kleinert M; Sylow L; Knudsen J; Gowans G; Hardie D; Richter E, Biochemical Journal, 2015

AMP-activated protein kinase (AMPK) occurs as heterotrimeric complexes in which a catalytic subunit (α1/α2) is bound to one of two b subunits (β1/β2) and one of three γ subunits (γ1/γ2/γ3). The ability to selectively activate specific isoforms would be a useful research tool, and a promising ...

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The {Less than}i{Greater than}Leishmania donovani {Less than}/i{Greater than}histidine acid ecto-phosphatase{Less than}i{Greater than} Ld{Less than}/i{Greater than}MAcP: insight into its structure and function

19-Feb-2015 | Papadaki A; Politou A; Smirlis D; Kotini M; Kourou K; Papamarcaki T; Boleti H, Biochemical Journal, 2015

Acid ecto-phosphatase activity has been implicated in Leishmania donovani promastigote virulence. Here we report data contributing to the molecular/structural and functional characterization of the Leishmania donovani LdMAcP, member of the histidine acid phosphatase family. LdMAcP, is membrane ...

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Small Molecule Inhibitors of ERK-mediated Immediate Early Gene Expression and Proliferation of Melanoma Cells Expressing Mutated BRaf

19-Feb-2015 | Samadani R; Zhang J; Brophy A; Oashi T; Priyakumar U; Raman E; St. John F; Jung K; Fletcher S; Pozharski E; MacKerel ..., Biochemical Journal, 2015

Constitutive activation of the extracellular signal-regulated kinases 1 and 2 (ERK1/2) are central to regulating the proliferation and survival of many cancer cells. The current inhibitors of ERK1/2 target ATP binding or the catalytic site and are therefore limited in their utility for ...

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Regulation of IGFBP-2 expression during fasting

19-Feb-2015 | Kang H; Kim M; Kim S; Lee J; Kim Y; Seo Y; Bae J; Oh G; Song D; Ahn Y; Im S, Biochemical Journal, 2015

Insulin-like growth factor (IGF)-binding protein-2 (IGFBP-2), one of the most abundant circulating IGFBPs, is known to attenuate the biological action of IGF-1. Although the effect of IGFBP-2 in preventing metabolic disorder is well known, its regulatory mechanism remains unclear. Here, we ...

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Inositol pyrophosphates regulate RNA polymerase I-mediated rRNA transcription in Saccharomyces cerevisiae

15-Feb-2015 | Thota SG; Unnikannan CP; Thampatty SR; Manorama R; Bhandari R, Biochemical Journal, 2015

Ribosome biogenesis is an essential cellular process regulated by the metabolic state of a cell. We examined whether inositol pyrophosphates, energy-rich derivatives of inositol that act as metabolic messengers, play a role in ribosome synthesis in the budding yeast, Saccharomyces cerevisiae. ...

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