Read by QxMD icon Read

ABC family

Gerald Davies, Liubov Lobanova, Wojciech Dawicki, Gary Groot, John R Gordon, Matthew Bowen, Troy Harkness, Terra Arnason
Multiple drug resistant (MDR) malignancy remains a predictable and often terminal event in cancer therapy, and affects individuals with many cancer types, regardless of the stage at which they were originally diagnosed or the interval from last treatment. Protein biomarkers of MDR are not globally used for clinical decision-making, but include the overexpression of drug-efflux pumps (ABC transporter family) such as MDR-1 and BCRP, as well as HIF1α, a stress responsive transcription factor found elevated within many MDR tumors...
2017: PloS One
Rupert Derler, Bernd Gesslbauer, Corinna Weber, Elisabeth Strutzmann, Ingrid Miller, Andreas Kungl
The recruitment of leukocytes, mediated by endothelium bound chemokine gradients, is a vital process in inflammation. The highly negatively charged, unbranched polysaccharide family of glycosaminoglycans (GAGs), such as heparan sulfate and chondroitin sulfate mediate chemokine immobilization. Specifically the binding of CXCL8 (interleukin 8) to GAGs on endothelial cell surfaces is known to regulate neutrophil recruitment. Currently, it is not clear if binding of CXCL8 to GAGs leads to endothelial downstream signaling in addition to the typical CXCR1/CXCR2 (C-X-C motif chemokine receptor 1 and 2)-mediated signaling which activates neutrophils...
December 4, 2017: International Journal of Molecular Sciences
Haokun Zhang, Takashi Kiuchi, Chikara Hirayama, Susumu Katsuma, Toru Shimada
The Drosophila eye color gene brown is known to control the transport of pteridine precursors in adult eyes. The Brown protein belongs to the ATP-binding cassette (ABC) transporter G family, which includes proteins encoded by the genes brown, scarlet, and white. These genes are responsible for pigmentation in Drosophila and the domestic silkworm Bombyx mori. Although orthologs of brown are conserved among insects, the function of this gene is only known in Drosophila. Here, we elucidated the function of the B...
November 27, 2017: Insect Biochemistry and Molecular Biology
Yasmin Edwards
OBJECTIVE: To demonstrate that the Msh3 ATPase domain is required for DNA mismatch repair and tumor suppression in a murine model. RESULTS: The DNA mismatch repair proteins are members of the ABC family of ATPases. ATP binding and hydrolysis regulates their mismatch repair function. In the current study, a mouse model was generated harboring a glycine to aspartic acid residue change in the Walker A motif of the ATPase domain of Msh3. Impaired ATP mediated release of the Msh2-Msh3 GD/GD complex from it's DNA substrate in vitro confirmed the presence of an ATPase defect...
November 25, 2017: BMC Research Notes
Liang Sun, Zhilong Lu, Jianxiu Li, Feifei Sun, Ribo Huang
Mechanisms for high L-lactic acid production remain unclear in many bacteria. Lactobacillus rhamnosus SCT-10-10-60 was previously obtained from L. rhamnosus ATCC 11443 via mutagenesis and showed improved L-lactic acid production. In this study, the genomes of strains SCT-10-10-60 and ATCC 11443 were sequenced. Both genomes are a circular chromosome, 2.99 Mb in length with a GC content of approximately 46.8%. Eight split genes were identified in strain SCT-10-10-60, including two LytR family transcriptional regulators, two Rex redox-sensing transcriptional repressors, and four ABC transporters...
November 20, 2017: Molecular Genetics and Genomics: MGG
Fuhong Dai, Won Gi Yoo, Ji-Yun Lee, Yanyan Lu, Jhang Ho Pak, Woon-Mok Sohn, Sung-Jong Hong
BACKGROUND: Multidrug resistance-associated protein 4 (MRP4) is a member of the C subfamily of the ABC family of ATP-binding cassette (ABC) transporters. MRP4 regulates ATP-dependent efflux of various organic anionic substrates and bile acids out of cells. Since Clonorchis sinensis lives in host's bile duct, accumulation of bile juice can be toxic to the worm's tissues and cells. Therefore, C. sinensis needs bile transporters to reduce accumulation of bile acids within its body. RESULTS: We cloned MRP4 (CsMRP4) from C...
November 21, 2017: Parasites & Vectors
Megan K McDonald, Julie-Anne Fritz, Dongxin Jia, Deborah Scheuchner, Floyd F Snyder, Avalyn Stanislaus, Jared Curle, Liang Li, Sally P Stabler, Robert H Allen, Paul E Mains, Roy A Gravel
Vitamin B12 (cobalamin, Cbl) is a micronutrient essential to human health. Cbl is not utilized as is but must go through complex subcellular and metabolic processing to generate two cofactor forms: methyl-Cbl for methionine synthase, a cytosolic enzyme; and adenosyl-Cbl for methylmalonyl-CoA mutase, a mitochondrial enzyme. Some 10-12 human genes have been identified responsible for the intracellular conversion of Cbl to cofactor forms, including genes that code for ATP-binding cassette (ABC) transporters acting at the lysosomal and plasma membranes...
November 11, 2017: Molecular Genetics and Metabolism
Katerina Elsnerova, Alena Bartakova, Josef Tihlarik, Jiri Bouda, Lukas Rob, Petr Skapa, Martin Hruda, Ivan Gut, Beatrice Mohelnikova-Duchonova, Pavel Soucek, Radka Vaclavikova
Epithelial ovarian cancer (EOC) has the highest mortality among gynecological carcinomas. The lack of specific markers for prognostic determination of EOC progression hinders the search for novel effective therapies. The aim of the present study was (i) to explore differences in expressions of ATP-binding cassette (ABC) and solute carrier (SLC) transporter genes, genes associated with drug metabolism and cell cycle regulation between control ovarian tissues (n = 14), primary EOCs (n = 44) and intraperitoneal metastases (n = 29); (ii) to investigate associations of gene expression levels with prognosis of patients with intraperitoneal metastases...
2017: Journal of Cancer
Michaela Wagner, Lu Shen, Andreas Albersmeier, Nienke van der Kolk, Sujin Kim, Jaeho Cha, Christopher Bräsen, Jörn Kalinowski, Bettina Siebers, Sonja-Verena Albers
Sulfolobus spp. possess a great metabolic versatility and grow heterotrophically on various carbon sources such as different sugars and peptides. Known sugar transporters in Archaea predominantly belong to ABC transport systems. Although several ABC transporters for sugar uptake have been characterized in the crenarchaeon Sulfolobus solfataricus, only one homologue of these transporters, the maltose/maltooligomer transporter, could be identified in the closely related Sulfolobus acidocaldarius Comparison of the transcriptome of S...
November 17, 2017: Applied and Environmental Microbiology
Yoshihiro Tsuchiya, Keiko Osaki, Mayu Kanamoto, Yuki Nakao, Ena Takahashi, Toru Higuchi, Hideaki Kamata
PP2A is composed of a scaffolding subunit (A), a catalytic subunit (C), and a regulatory subunit (B) that is classified into four families including B, B', B'', and B'''/striatin. Here, we found that a distinct PP2A complex regulates NF-κB signaling by dephosphorylation of IKKβ, IκBα, and RelA/p65. The PP2A core enzyme AC dimer and the holoenzyme AB'''C trimer dephosphorylate IKKβ, IκBα, and RelA, whereas the ABC trimer dephosphorylates IκBα but not IKKβ and RelA in cells. In contrast, AB'C and AB''C trimers have little effect on dephosphorylation of these signaling proteins...
November 15, 2017: FEBS Letters
Ricardo J Ferreira, Cátia A Bonito, M Natália D S Cordeiro, Maria-José U Ferreira, Daniel J V A Dos Santos
Efflux pumps of the ATP-binding cassette transporters superfamily (ABC transporters) are frequently involved in the multidrug-resistance (MDR) phenomenon in cancer cells. Herein, we describe a new atomistic model for the MDR-related ABCG2 efflux pump, also named breast cancer resistance protein (BCRP), based on the recently published crystallographic structure of the ABCG5/G8 heterodimer sterol transporter, a member of the ABCG family involved in cholesterol homeostasis. By means of molecular dynamics simulations and molecular docking, a far-reaching characterization of the ABCG2 homodimer was obtained...
November 14, 2017: Scientific Reports
Lin-Fan Xiao, Wei Zhang, Tian-Xing Jing, Meng-Yi Zhang, Ze-Qing Miao, Dan-Dan Wei, Guo-Rui Yuan, Jin-Jun Wang
The ATP-binding cassette (ABC) is the largest transporter gene family and the genes play key roles in xenobiotic resistance, metabolism, and development of all phyla. However, the specific functions of ABC gene families in insects is unclear. We report a genome-wide identification, phylogenetic, and transcriptional analysis of the ABC genes in the oriental fruit fly, Bactrocera dorsalis (Hendel). We identified a total of 47 ABC genes (BdABCs) from the transcriptomic and genomic databases of B. dorsalis and classified these genes into eight subfamilies (A-H), including 7 ABCAs, 7 ABCBs, 9 ABCCs, 2 ABCDs, 1 ABCE, 3 ABCFs, 15 ABCGs, and 3 ABCHs...
October 10, 2017: Comparative Biochemistry and Physiology. Part D, Genomics & Proteomics
Romana-Rea Begicevic, Marco Falasca
The efficacy of chemotherapy is one of the main challenges in cancer treatment and one of the major obstacles to overcome in achieving lasting remission and a definitive cure in patients with cancer is the emergence of cancer resistance. Indeed, drug resistance is ultimately accountable for poor treatment outcomes and tumour relapse. There are various molecular mechanisms involved in multidrug resistance, such as the change in the activity of membrane transporters primarily belonging to the ATP binding cassette (ABC) transporter family...
November 8, 2017: International Journal of Molecular Sciences
Jiyoung Park, Youngsook Lee, Enrico Martinoia, Markus Geisler
Hormone transporters are crucial for plant hormone action, which is underlined by severe developmental and physiological impacts caused by their loss-of-function mutations. Here, we summarize recent knowledge on the individual roles of plant hormone transporters in local and long-distance transport. Our inventory reveals that many hormones are transported by members of distinct transporter classes, with an apparent dominance of the ATP-binding cassette (ABC) family and of the Nitrate transport1/Peptide transporter family (NPF)...
October 25, 2017: BMC Biology
P Pignatelli, V A Ingham, V Balabanidou, J Vontas, G Lycett, H Ranson
The role of ATP-binding cassette (ABC) transporters in conferring insecticide resistance has received much attention recently. Here we identify ABC transporters differentially expressed in insecticide-resistant populations of the malaria vector, Anopheles gambiae. Although we found little evidence that the orthologues of the multidrug resistance proteins described in other species are associated with resistance in An. gambiae we did identify a subset of ABC proteins consistently differentially expressed in pyrethroid-resistant populations from across Africa...
October 25, 2017: Insect Molecular Biology
Katarzyna Donskow-Łysoniewska, Katarzyna Krawczak, Ewa Kozłowska, Maria Doligalska
Host immunosuppression occurs during chronic nematode infection, partly due to effector T-cell hyporesponsiveness. The role of P-glycoprotein (P-gp), a member of the ABC-transporter family, has been assessed in T-cell activity. The present study assesses the possible role of P-gp in T-cell activity during nematode infection. Our findings indicate that blockade of P-gp in vivo increased protection against Heligmosomoides polygyrus nematode infection, and was associated with enhanced T-cell activity. Three P-gp-inhibitors, Verapamil (VRP), Cyclosporine (CsA) and Tariquidar (XR9576), were used to determine the influence of nematode infection on the P-gp function of T-cells...
October 24, 2017: Parasite Immunology
Won-Jae Chi
Streptomyces griseus DasR is divergently encoded upstream of dasA, which itself encodes a substrate-binding protein of an ATP-binding cassette (ABC) transport system. As determined by DNase I footprinting using recombinant DasR prepared from Escherichia coli, DasR bound to two operator sequences-O1 located at nucleotide positions -22 to -13, with respect to the transcriptional start point of dasA, and O2 located at positions +3 to +12. Gel-mobility shift assays using the DNA fragments containing one or both of the two operator sequences suggested that a DasR dimer bound first to O2 and the DNA-bound DasR recruited another dimer to O1, resulting in the formation of a stable DNA-protein complex that prevented RNA polymerase from binding to the dasA promoter...
October 25, 2017: Journal of Microbiology and Biotechnology
Satoshi Hashimoto, Shun-Ichiro Katoh, Takehiro Kato, Daisuke Urabe, Masayuki Inoue
Resiniferatoxin (1) belongs to a daphnane diterpenoid family and has strong agonistic effects on TRPV1, a transducer of noxious temperature and chemical stimuli. The densely oxygenated trans-fused 5/7/6-tricarbocycle (ABC-ring) of 1 presents a daunting challenge for chemical synthesis. Here we report the development of a novel radical-based strategy for assembling 1 from three components: A-ring 9, allyl stannane 18b, and C-ring 17b. The 6-membered 17b, prepared from d-ribose derivative 19, was designed to possess the caged orthoester structure with α-alkoxy selenide as a radical precursor...
November 15, 2017: Journal of the American Chemical Society
Audrey M V Ah-Fong, Jolly Shrivastava, Howard S Judelson
BACKGROUND: How pathogen genomes evolve to support distinct lifestyles is not well-understood. The oomycete Phytophthora infestans, the potato blight agent, is a largely biotrophic pathogen that feeds from living host cells, which become necrotic only late in infection. The related oomycete Pythium ultimum grows saprophytically in soil and as a necrotroph in plants, causing massive tissue destruction. To learn what distinguishes their lifestyles, we compared their gene contents and expression patterns in media and a shared host, potato tuber...
October 10, 2017: BMC Genomics
Markus Geisler, Bibek Aryal, Martin di Donato, Pengchao Hao
Different subclasses of ATP-binding cassette (ABC) transporters have been implicated in the transport of native variants of the phytohormone auxin. Here, the putative, individual roles of key members belonging to the ABCB, ABCD and ABCG families, respectively, are highlighted and the knowledge of their assumed expression and transport routes is reviewed and compared with their mutant phenotypes. Protein-protein interactions between ABC transporters and regulatory components during auxin transport are summarized and their importance is critically discussed...
July 31, 2017: Plant & Cell Physiology
Fetch more papers »
Fetching more papers... Fetching...
Read by QxMD. Sign in or create an account to discover new knowledge that matter to you.
Remove bar
Read by QxMD icon Read

Search Tips

Use Boolean operators: AND/OR

diabetic AND foot
diabetes OR diabetic

Exclude a word using the 'minus' sign

Virchow -triad

Use Parentheses

water AND (cup OR glass)

Add an asterisk (*) at end of a word to include word stems

Neuro* will search for Neurology, Neuroscientist, Neurological, and so on

Use quotes to search for an exact phrase

"primary prevention of cancer"
(heart or cardiac or cardio*) AND arrest -"American Heart Association"