Binding Sites

Publication Title: 
Dalton Transactions (Cambridge, England: 2003)

The health benefits of cranberries have long been recognized. However, the mechanisms behind its function are poorly understood. We have investigated the iron-binding properties of quercetin, the major phenolic phytochemical present in cranberries, and other selected phenolic compounds (chrysin, 3-hydroxyflavone, 3',4'-dihydroxy flavone, rutin, and flavone) in aqueous media using UV/vis, NMR and EPR spectroscopies and ESI-Mass spectrometry.

Author(s): 
Guo, Maolin
Perez, Carlos
Wei, Yibin
Rapoza, Elise
Su, Gregory
Bou-Abdallah, Fadi
Chasteen, N. D.
Publication Title: 
Combinatorial Chemistry & High Throughput Screening

A high throughput screening assay for the identification of ligands to pharmacologically significant receptors was developed based on magnetic particles containing immobilized receptors followed by liquid chromatography-mass spectrometry (LC-MS). This assay is suitable for the screening of complex mixtures such as botanical extracts. For proof-of-principle, estrogen receptor-alpha (ER-alpha) and ER-beta were immobilized on magnetic particles functionalized with aldehyde or carboxylic acid groups.

Author(s): 
Choi, Yongsoo
van Breemen, Richard B.
Publication Title: 
Cancer Research

Acetyl-keto-beta-boswellic acid (AKBA), a triterpenoid isolated from Boswellia carterri Birdw and Boswellia serrata, has been found to inhibit tumor cell growth and to induce apoptosis. The apoptotic effects and the mechanisms of action of AKBA were studied in LNCaP and PC-3 human prostate cancer cells. AKBA induced apoptosis in both cell lines at concentrations above 10 microg/mL. AKBA-induced apoptosis was correlated with the activation of caspase-3 and caspase-8 as well as with poly(ADP)ribose polymerase (PARP) cleavage.

Author(s): 
Lu, Min
Xia, Lijuan
Hua, Huiming
Jing, Yongkui
Publication Title: 
Biochemical Society Transactions

MS, with or without pre-analysis peptide fractionation, can be used to decipher the residues on proteins where oxidative modifications caused by peroxynitrite, singlet oxygen or electrophilic lipids have occurred. Peroxynitrite nitrates tyrosine and tryptophan residues on the surface of actin. Singlet oxygen, formed by the interaction of UVA light with tryptophan, can oxidize neighbouring cysteine, histidine, methionine, tyrosine and tryptophan residues.

Author(s): 
Barnes, Stephen
Shonsey, Erin M.
Eliuk, Shannon M.
Stella, David
Barrett, Kerri
Srivastava, Om P.
Kim, Helen
Renfrow, Matthew B.
Publication Title: 
Journal of Inorganic Biochemistry

Baicalein and baicalin, the major bioactive compounds found in the Chinese herb Scutellaria baicalensis, have been shown to be effective against cancer, bacterial infections and oxidative stress diseases. However, little is known about their mechanisms of action. To probe whether iron homeostasis modulation may play a role in their bioactivity, we have investigated their iron binding characteristics under physiologically relevant conditions.

Author(s): 
Perez, Carlos A.
Wei, Yibin
Guo, Maolin
Publication Title: 
The Journal of Biological Chemistry

Our recent study has shown that betaA3-crystallin along with betaB1- and betaB2-crystallins were part of high molecular weight complex obtained from young, old, and cataractous lenses suggesting potential interactions between alpha- and beta-crystallins (Srivastava, O. P., Srivastava, K., and Chaves, J. M. (2008) Mol. Vis. 14, 1872-1885). To investigate this further, this study was carried out to determine the interaction sites of betaA3-crystallin with alphaA- and alphaB-crystallins.

Author(s): 
Gupta, Ratna
Srivastava, Om P.
Publication Title: 
Thrombosis and Haemostasis

High-mobility group box 1 protein (HMGB1), an abundant nuclear protein, was recently established as a proinflammatory mediator of experimental sepsis. Although extracellular HMGB1 has been found in atherosclerotic plaques, its potential role in the pathogenesis of atherothrombosis remains elusive. In the present study, we determined whether HMGB1 induces tissue factor (TF) expression in vascular endothelial cells (ECs) and macrophages. Our data showed that HMGB1 stimulated ECs to express TF (but not TF pathway inhibitor) mRNA and protein in a concentration- and time-dependent manner.

Author(s): 
Lv, Ben
Wang, Haichao
Tang, Yiting
Fan, Zhang
Xiao, Xianzhong
Chen, Fangping
Publication Title: 
The Journal of Biological Chemistry

PCSK9 is a natural inhibitor of LDL receptor (LDLR) that binds the extracellular domain of LDLR and triggers its intracellular degradation. PCSK9 and LDLR are coordinately regulated at the transcriptional level by sterols through their promoter-imbedded sterol response elements (SRE) and co-induced by statins. Identification of regulatory networks modulating PCSK9 transcription is important for developing selective repressors of PCSK9 to improve statin efficacy by prolonging the up-regulation of LDLR.

Author(s): 
Li, Hai
Dong, Bin
Park, Sahng Wook
Lee, Hyun-Sook
Chen, Wei
Liu, Jingwen
Publication Title: 
Gastroenterology

BACKGROUND & AIMS: Hepatic de-differentiation, liver development, and malignant transformation are processes in which the levels of hepatic S-adenosylmethionine are tightly regulated by 2 genes: methionine adenosyltransferase 1A (MAT1A) and methionine adenosyltransferase 2A (MAT2A). MAT1A is expressed in the adult liver, whereas MAT2A expression primarily is extrahepatic and is associated strongly with liver proliferation. The mechanisms that regulate these expression patterns are not completely understood.

Author(s): 
Vázquez-Chantada, Mercedes
Fernández-Ramos, David
Embade, Nieves
Martínez-López, Nuria
Varela-Rey, Marta
Woodhoo, Ashwin
Luka, Zigmund
Wagner, Conrad
Anglim, Paul P.
Finnell, Richard H.
Caballeria, Juan
Laird-Offringa, Ite A.
Gorospe, Myriam
Lu, Shelly C.
Mato, José M.
Martínez-Chantar, M. Luz
Publication Title: 
The Journal of Neuroscience: The Official Journal of the Society for Neuroscience

MicroRNA has emerged as a critical regulator of neuronal functions. This study aimed to test whether let-7 microRNAs can regulate the mu opioid receptor (MOR) and opioid tolerance. Employing bioinformatics, we identified a let-7 binding site in the 3'-untranslated region (UTR) of MOR mRNA, which was experimentally confirmed as a direct target of let-7. The repressive regulation of MOR by let-7 was revealed using a LNA-let-7 inhibitor to knockdown let-7 in SH-SY5Y cells.

Author(s): 
He, Ying
Yang, Cheng
Kirkmire, Chelsea M.
Wang, Zaijie Jim

Pages

Subscribe to RSS - Binding Sites