Health Information Search Results
Peer Reviewed Scientific Research Reports.
|<< Prev 20 ||Showing 1 to 20 of 319 Matches||Next 20 >>|
1. Structural determinants of opioid activity in derivatives of 14-aminomorphinones: effects of changes to the chain linking of the C14-amino group to the aryl ring.
Match Strength: 4.951
The 14-aminodihydromorphinone and codeinone series of opioid ligands have produced a number of ligands of substantial interest. To investigate the importance of the 14-substituent, a series of analogues in which the side chain length is varied and the amide and alkene functions are reduced have been prepared. Binding affinity, particularly at the mu-opioid receptor (MOR), was largely determined by the aromatic group of the side chain. In the [35S]GTPgammaS functional assay, the ligands having a three-carbon side chain were more potent antagonists than their longer chain counterparts, while ... Read More »
» Published in J Med Chem. 2006 Oct 5;49(20):6104-10.
2. Heterotypic complex formation between subunits of microtubule-associated proteins 1A and 1B is due to interaction of conserved domains.
Match Strength: 4.454
The microtubule-associated proteins MAP1A and MAP1B are related but distinct multi-subunit protein complexes that consist of heavy and light chains. The predominant forms of these complexes are homotypic, i.e. they consist of a MAP1A heavy chain associated with MAP1A light chains or a MAP1B heavy chain associated with MAP1B light chains, respectively. In addition, MAP1A and MAP1B can exchange subunits and form heterotypic complexes consisting of a MAP1A heavy chain associated with MAP1B light chains which might play a role in a transition period of neuronal differentiation. Here we extend ... Read More »
» Published in Biochim Biophys Acta. 2006 Oct;1763(10):1011-6. Epub 2006 Aug 25.
3. Motion of a branched polymer chain in confinement: a Monte Carlo study.
Match Strength: 4.368
The aim of the study was a theoretical investigation of the polymer molecules located between two parallel and impenetrable surfaces which were also attractive for polymer segments. The chains were constructed of identical segments and were restricted to knots of a simple cubic lattice. Since the chains were at good solvent conditions the only interactions between the segments of the chain were the excluded volume. The properties of the model chains were determined by means of Monte Carlo simulations with a sampling algorithm based on the chain's local changes of conformation. The differences ... Read More »
» Published in J Chem Phys. 2006 Sep 14;125(10):104901.
4. Molecular mechanisms for transcriptional regulation of human high-affinity IgE receptor beta-chain gene induced by GM-CSF.
Match Strength: 4.216
The beta-chain of the high-affinity receptor for IgE (FcepsilonRI) plays an important role in regulating activation of FcepsilonRI-expressing cells such as mast cells in allergic reactions. We already reported that the transcription factor myeloid zinc finger (MZF) 1 which formed a high m.w. complex including four and a half LIM-only protein (FHL)3 in the nucleus repressed human beta-chain gene expression through an element in the fourth intron. We also found that GM-CSF induced expression of MZF-1 and nuclear translocation of FHL3. We screened a human cDNA library and identified NFY which was ... Read More »
» Published in J Immunol. 2006 Oct 1;177(7):4605-11.
5. Food store availability and neighborhood characteristics in the United States.
Match Strength: 3.932
OBJECTIVE.: This study provides a multivariate analysis of the availability of food store outlets in the US and associations with neighborhood characteristics on race, ethnicity and socioeconomic status (SES). METHOD.: Commercial food store outlet data are linked across 28,050 zip codes to Census 2000 data. Multivariate regression analyses are used to examine associations between the availability of chain supermarkets, non-chain supermarkets, grocery stores and convenience stores and neighborhood characteristics on race, ethnicity and SES including additional controls for population size, ... Read More »
» Published in Prev Med. 2006 Sep 22;
6. Different T-cell receptor (TCR) zeta chain expression in cervical cancer and its precursor lesions.
Match Strength: 3.904
OBJECTIVE: Cervical cancer is associated with infection of epithelial cells with the human papillomavirus (HPV) type 16 and HPV18. A functional signalling machinery in T-cells is required in order to successfully fight and eradicate HPV16+ transformed epithelial cells. One of the key signalling molecules associated with the T-cell receptor (TCR) is the homodimeric zeta chain molecule. MATERIAL AND METHODS: 28 formalin fixed und paraffin embedded samples of cervical tissue with cervical intraepithelial lesions CIN I (n = 3), CIN III (n = 7), invasive cervical carcinoma (CC) (n = 13) and normal ... Read More »
» Published in Zentralbl Gynakol. 2006 Oct;128(5):266-70.
7. A novel domain on HLA-DRbeta chain regulates the chaperone role of the invariant chain.
Match Strength: 3.733
The human lymphocyte antigen (HLA) class II region encodes highly polymorphic peptide receptors, which associate in the ER to the chaperone invariant chain (Ii). Ii facilitates assembly of class II subunits to functional peptide receptors. We searched for a conserved structure on HLA-DR polypeptides that mediates contact to a previously identified proline-rich class-II-binding sequence of Ii. Major histocompatibility complex (MHC) class II beta chain sequences exhibit two conserved tryptophan residues separated by 22 amino acids. Inspection of this motif in the X-ray structure of DR3 showed ... Read More »
» Published in J Cell Sci. 2006 Oct 15;119(Pt 20):4207-14. Epub 2006 Sep 19.
8. Monitoring temperatures in the vaccine cold chain in Bolivia.
Match Strength: 3.672
This study monitored vaccine cold chain temperatures during routine DTP-HB-Hib vaccine shipments from central stores to 11 communities in 3 provinces of Bolivia. In all 11 monitored shipments, vaccines were exposed to freezing temperatures at one or more points. In each of the shipments, temperatures below 0 degrees C were recorded for 2-50% of the monitoring period. Freezing occurred at almost every level of the cold chain distribution system, especially during district and health center storage and during transport to the province and district levels. Seven of the 11 shipments were exposed ... Read More »
» Published in Vaccine. 2007 Jan 5;25(3):433-7. Epub 2006 Aug 28.
9. Association of the pre-B cell receptor (BCR) expression level with the quality of pre-BII cell differentiation reveals hierarchical pre-BCR function.
Match Strength: 3.635
The expression of a pre-B cell receptor (pre-BCR) is required for allelic exclusion and pre-BII cell differentiation. V(H)12 microH chains are unusual in that they form pre-BCRs and mediate allelic exclusion, but most cannot drive pre-BII cell differentiation. To explain this paradox, we examined pre-BCR functions and pre-BII cell differentiation in mice expressing microH chain transgenes encoding a B cell-permissible V(H)12 microH chain (designated 10/G4(6-1)), and a non-permissible V(H)12 microH chain (designated 8/G0). Compared with 10/G4 pre-BCRs, 8/G0 pre-BCRs are expressed at low levels ... Read More »
» Published in Mol Immunol. 2007 Mar;44(7):1765-74. Epub 2006 Sep 27.
10. The inhibitory action of long-chain fatty acids on the DNA binding activity of p53.
Match Strength: 3.599
The in vitro relationship between human p53 DNA binding domain (p53 DBD) and FA was investigated. We found that saturated and monounsaturated long-chain FA inhibited the double-stranded DNA (dsDNA) binding activity of p53 DBD. The strongest inhibitors of saturated and unsaturated FA were docosanoic acid (22:0) and cis-12-heneicosenoic acid (21:1n-9), respectively. n-Octadecane, trans-unsaturated FA, and FAME had no influence on the binding activity of p53 DBD, showing that the FA structures such as one or no double bond of cis configuration, hydrocarbon chain of length C20 to C22, and free ... Read More »
» Published in Lipids. 2006 Jun;41(6):521-7.
11. The binding of DYNLL2 to myosin Va requires alternatively spliced exon B and stabilizes a portion of the myosin's coiled-coil domain.
Match Strength: 3.549
The myosin Va light chain DYNLL2 has been proposed to function as an adaptor to link the myosin to certain cargo. Here, we mapped the binding site for DYNLL2 within the myosin Va heavy chain. Copurification and pull-down experiments showed that the heavy chain contains a single DYNLL2 binding site and that this site resides within a discontinuity in the myosin's central coiled-coil domain. Importantly, exon B, an alternatively spliced, three-amino acid exon, is a part of this binding site, and we show in the context of full-length myosin Va that this exon is required for DYNLL2-myosin Va ... Read More »
» Published in Biochemistry. 2006 Sep 26;45(38):11564-77.
12. Normal muscle respiratory chain enzymes can complicate mitochondrial disease diagnosis.
Match Strength: 3.538
This report presents a case of mitochondrial respiratory chain deficiency in a neonate with elevated plasma lactate, hypotonia, developmental delay, and dysmorphic features. The initial biochemical analyses of muscle tissue for mitochondrial function were normal. Additional testing on skin fibroblasts performed owing to a high clinical suspicion of a possible mitochondrial disorder indicated a deficiency of mitochondrial complex I. Western blotting of samples obtained both from muscle and fibroblast tissues also revealed an extensive defect in mitochondrial respiratory chain complex I, ... Read More »
» Published in Pediatr Neurol. 2006 Oct;35(4):289-92.
13. EPR Studies of Recombinant Horse L-Chain Apoferritin and its Mutant (E 53,56,57,60 Q) with Haemin.
Match Strength: 3.529
Structural similarities between ferritins and bacterioferritins have been extensively demonstrated. However, there is an essential difference between these two types of ferritins: whereas bacterioferritins bind haem, in-vivo, as Fe(II)-protoporphyrin IX (this haem is located in a hydrophobic pocket along the 2-fold symmetry axes and is liganded by two axial Met 52 residues), eukaryotic ferritins are non-haem iron proteins. However, in in-vivo studies, a cofactor has been isolated from horse spleen apoferritin similar to protoporphyrin IX; in in-vitro experiments, it has been shown that horse ... Read More »
» Published in Biometals. 2007 Feb;20(1):21-6. Epub 2006 May 12.
14. Identification of NanE as the thioesterase for polyether chain release in nanchangmycin biosynthesis.
Match Strength: 3.356
The polyketide synthase (PKS) for the biosynthesis of the polyether nanchangmycin lacks an apparent thioesterase comparable to the type I thioesterase domains of the modular PKSs responsible for macrolide biosynthesis. Three candidate polyether chain-releasing factors were examined. Both the putative CR domain and the NanE protein appeared to be genetically relevant. Among the three heterologously expressed soluble proteins (recombinant CR domain, the ACP-CR didomain, and NanE) tested, only NanE hydrolyzed the polyether-SNAC. By contrast, recombinant DEBS TE from the erythromycin pathway, and ... Read More »
» Published in Chem Biol. 2006 Sep;13(9):945-55.
15. Tripfordines A-C, sesquiterpene pyridine alkaloids from Tripterygium wilfordii, and structure anti-HIV activity relationships of Tripterygium alkaloids.
Match Strength: 3.349
Three new sesquiterpene pyridine alkaloids, tripfordines A-C (1-3), were isolated from an ethanolic extract of the roots of Tripterygium wilfordii, along with eight known pyridine alkaloids, and tested for in vitro cytotoxic and anti-HIV activity. The structures of the new compounds were established on the basis of spectroscopic data interpretation. Anti-HIV structure-activity relationships (SAR) for this compound type are proposed on the basis of the screening results from the newly isolated compounds and prior data of known sesquiterpene pyridine alkaloids. The position of a carboxyalkyl ... Read More »
» Published in J Nat Prod. 2006 Sep;69(9):1271-4.
16. A ubiquitin ligase complex assembles linear polyubiquitin chains.
Match Strength: 3.283
The ubiquitin system plays important roles in the regulation of numerous cellular processes by conjugating ubiquitin to target proteins. In most cases, conjugation of polyubiquitin to target proteins regulates their function. In the polyubiquitin chains reported to date, ubiquitin monomers are linked via isopeptide bonds between an internal Lys and a C-terminal Gly. Here, we report that a protein complex consisting of two RING finger proteins, HOIL-1L and HOIP, exhibits ubiquitin polymerization activity by recognizing ubiquitin moieties of proteins. The polyubiquitin chain generated by the ... Read More »
» Published in EMBO J. 2006 Oct 18;25(20):4877-87. Epub 2006 Sep 28.
17. Artificial muscles based on liquid crystal elastomers.
Match Strength: 3.189
This paper presents our results on liquid crystal (LC) elastomers as artificial muscle, based on the ideas proposed by de Gennes. In the theoretical model, the material consists of a repeated series of main-chain nematic LC polymer blocks, N, and conventional rubber blocks, R, based on the lamellar phase of a triblock copolymer RNR. The motor for the contraction is the reversible macromolecular shape change of the chain, from stretched to spherical, that occurs at the nematic-to-isotropic phase transition in the main-chain nematic LC polymers.We first developed a new kind of muscle-like ... Read More »
» Published in Philos Transact A Math Phys Eng Sci. 2006 Oct 15;364(1847):2763-77.
18. Metabolic regulation of sodium-calcium exchange by intracellular acyl CoAs.
Match Strength: 3.182
The sodium-calcium exchanger (NCX) is a critical mediator of calcium homeostasis. In the heart, NCX1 predominantly operates in forward mode to extrude Ca(2+); however, reverse-mode NCX1 activity during ischemia/reperfusion (IR) contributes to Ca(2+) loading and electrical and contractile dysfunction. IR injury has also been associated with altered fat metabolism and accumulation of long-chain acyl CoA esters. Here, we show that acyl CoAs are novel, endogenous activators of reverse-mode NCX1 activity, exhibiting chain length and saturation dependence, with longer chain saturated acyl moieties ... Read More »
» Published in EMBO J. 2006 Oct 4;25(19):4605-14. Epub 2006 Sep 14.
19. Comparison of seasonal dynamics of the essential PUFA contents in benthic invertebrates and grayling Thymallus arcticus in the Yenisei river.
Match Strength: 3.080
Seasonal dynamics of contents of essential polyunsaturated fatty acids (PUFA) in dominant groups of benthic invertebrates: gammarids (Gammaridae, Amphipoda), oligochaetes (Oligochaeta), chironomid larvae (Chironomidae, Diptera) and caddisfly larvae (Trichoptera), and dominant benthivorous fish, Siberian grayling Thymallus arcticus, have been studied in ecosystem of the large Siberian river. During the year of the study most benthic invertebrate taxa showed significant variations in the contents of both C-18 and long chain C-20-22 PUFAs. In contrast, the fish, which consumed the zoobenthos, had ... Read More »
» Published in Comp Biochem Physiol B Biochem Mol Biol. 2006 Nov-Dec;145(3-4):278-87. Epub 2006 Aug 7.
20. Quorum signal molecules as biosurfactants affecting swarming in Rhizobium etli.
Match Strength: 3.074
Swarming motility is suggested to be a social phenomenon that enables groups of bacteria to coordinately and rapidly move atop solid surfaces. This multicellular behavior, during which the apparently organized bacterial populations are embedded in an extracellular slime layer, has previously been linked with biofilm formation and virulence. Many population density-controlled activities involve the activation of complex signaling pathways using small diffusible molecules, also known as autoinducers. In Gram-negative bacteria, quorum sensing (QS) is achieved primarily by means of N ... Read More »
» Published in Proc Natl Acad Sci U S A. 2006 Oct 3;103(40):14965-70. Epub 2006 Sep 21.
|<< Prev 20 ||Showing results 1 to 20 of 319||Next 20 >>|
* All information on Level1Diet.com is for educational purposes only. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure or prevent any disease. Before changing your diet, or adding supplements to your diet, or beginning an exercise program, everyone should consult a qualified and licensed health practitioner; a physician, dietician or similar professional.