共查询到20条相似文献,搜索用时 15 毫秒
1.
Adrenergic-receptor beta2 (ADRB2) and beta3 (ADRB3) are obesity genes that play a key role in the regulation of energy balance by increasing lipolysis and thermogenesis. The Glu27 allele in ADRB2 and the Arg64 allele in ADRB3 are associated with abdominal obesity and early onset of non-insulin-dependent diabetes mellitus (NIDDM) in many ethnic groups. Peroxisome proliferator-activated receptor γ (PPARG) is required for adipocyte differentiation. Pro12Ala mutation decreases PPARG activity and resistance to NIDDM. In humans, energy-expense alleles, Gln27 in ADRB2 and Trp64 in ADRB3, are at higher frequencies than Glu27 and Arg64, respectively, but Ala12 in PPARG is at lower frequency than Pro12. Adaptation of humans for lipolysis, thermogenesis, and reduction of fat accumulation could be considered by examining which alleles in these genes are dominant in non-human primates (NHP). All NHP (P. troglodytes, G. gorilla, P. pygmaeus, H. agilis and macaques) had energy-thrifty alleles, Gly16 and Glu27 in ADRB2, and Arg64 in ADRB3, but did not have energy-expense alleles, Arg16, Gln27 and Trp64 alleles. In PPARG gene, all NHP had large adipocyte accumulating type, the Pro12 allele. CONCLUSIONS: These results indicate that a tendency to produce much more heat through the energy-expense alleles developed only in humans, who left tropical rainforests for savanna and developed new features in their heat-regulation systems, such as reduction of body hair and increased evaporation of water, and might have helped the protection of entrails from cold at night, especially in glacial periods. 相似文献
2.
John M. Pope Philip R. Stevens Michael T. Angotti Robert Nakon 《Analytical biochemistry》1980,103(1):214-221
Potentiometric, visible, and infrared studies of the complexation of N-(2-acetamido)-2-aminoethanesulfonic acid (ACESH) by Ca(II), Mg(II), Mn(II), Co(II), Zn(II), Ni(II), and Cu(II) are reported. Ca(II), Mg(II), and Mn(II) were found not to complex with ACES?, while Co(II), Zn(II), Ni(II), and Cu(II) were found to form 2:1, ACES? to M2+, complexes, and [Cu(ACES)2] was found to undergo stepwise deprotonation of the amide groups to form [Cu(H?1ACES)22?]. Formation (affinity) constants for the various metal complexes are reported, and the probable structures of the various metal chelates in solution are discussed. 相似文献
3.
The chief motive behind this research is the interest provoked by the presence of metal ions as necessary stabilizers of the negative charges of phosphate groups in nucleic acids. The effect that the presence of different metal ions produces on the band principally assigned to the nu(s) PO(3)(2-) mode has been studied using FT-IR and FT-Raman spectroscopy. The results obtained reveal the diagnostic capacity of these techniques in determining the type of metal ion interaction with respect to the mononucleotides that form DNA and RNA, providing a tool for improving the knowledge of the stabilizing or destabilizing effects of these ions on such macromolecules. The metal complexes of the ribonucleotides 5'-CMP and 5'-GMP with Mg(II), Ca(II), Sr(II), Ba(II), Cr(III), Co(II), Cu(II), Zn(II), Cd(II), Al(III) and Ga(III) were obtained in this study. After studying and analyzing the IR and Raman spectra of all these complexes and comparing them with the spectra of the corresponding disodium salts, it was verified that, independently of the type of nucleotide involved, the presence of the metal in the vicinity of the phosphate group produces an alteration in the aforementioned nu(s) PO(3)(2-) band. This effect is related to the type of interaction that the phosphate group has with the metal. Three components are observed: (1) one near 983-975 cm(-1) (detectable in IR and Raman), associated with phosphate groups in an electrostatic type of interaction with the metal ion, separated by two or more water molecules; (2) another near 989-985 cm(-1) (only in IR), associated with phosphate groups in indirect interaction through the water molecules of the coordination sphere of the metal ions; and (3) the IR and Raman bands near 1014-1001 cm(-1), which represent phosphate groups directly bonded to the metal ion. These results are supported by the behavior of 5'-CMP in aqueous solution in the presence of Mg(II) ions. 相似文献
4.
《Inorganica chimica acta》1988,146(1):65-73
The oxovanadium(IV), acetatomanganese(III), chloroiron(III), nickel(II), copper(II), zinc(II) and palladium(II) of 3,3′-(1,2-phenylenediimino)diacrolein were prepared and investigated by means of mass, electronic, vibrational, NMR and ESR spectroscopy as well as magnetic susceptibility measurements. The acetatomanganese(III) and chloroiron(III) complexes were confirmed to be of high spin type. The absorption bands appearing in the energy range greater than 23 000 cm−1 were attributed to π→π* transitions within a ligand molecule and charge- transfer transitions from metal to ligand. The metal complexes assume the square-planar configuration type since the ligand-field bands were detected in the 12 700–18 500 cm−1 region. Strong bands appearing at 1601 and 1627 cm−1 were assigned to the CC and CO stretching vibrational modes, respectively, and were shifted to lower frequency upon metal-coordination. A VO stretching band was observed at 982 cm−1 for the oxovanadium(IV) complex and a CO stretching band was observed at 1547 cm−1 for the acetatomanganese(III) complex. Upon complex formation the amine proton signal is found to vanish and the aldehydic methine proton signal in the lowest field is shifted upfield for the nickel(II), zinc(II) and palladium(II) complexes. 13C NMR spectra support the coordination structure of the complexes which is revealed by 1H NMR spectra. As judged by the spin Hamiltonian parameters, the oxovanadium(IV) complex is of a square- planar type with an unpaired electron in the dxy orbital and the copper(II) complex assumes a distorted square-planar coordination due to the presence of five- and six-membered chelate rings with an unpaired electron in the dx2−y2 orbital. 相似文献
5.
Masayuki Sakakibara Masanao Matsui 《Bioscience, biotechnology, and biochemistry》2013,77(5):1131-1137
The syntheses of three dl-demethylvariotins are described. 相似文献
6.
The incidental finding of DM's, minutes, HSR's, PCC, and PCD in two completely unrelated cases--one is a prenatal diagnosis in a twin pregnancy complicated by hydramnios and feto-fetal exsanguination, the other is an adult Klinefelter patient--raises the question whether such findings are coincidental or whether there is a common denominator in such cases. Possible relationships between these phenomena and the observed cases are discussed. 相似文献
7.
《Inorganica chimica acta》1986,123(2):87-90
Derivatives of Co(II), Ni(II), Cu(II) and Zn(II) with 3′AMP and 2′AMP were synthesized and characterized by IR UV-Vis and fluorescence spectroscopy. There seems to be bonding of the metal ion to the base in all cases. The activation test, using the complexes as allosteric labels, was carried out with rabbit muscle glycogen phosphorylase b, but the enzyme was not activated, confirming that the phosphate group must necessarily be bonded to position 5′ of the ribose in order to activate this enzyme. 相似文献
8.
Joseph P. Foley David Lam Hongmei Jiang Jie Liao Naeun Cheong Theresa M. McDevitt Aisha Zaman Jo Rae Wright Rashmin C. Savani 《The Journal of biological chemistry》2012,287(44):37406-37419
The innate immune system protects the host from bacterial and viral invasion. Surfactant protein A (SPA), a lung-specific collectin, stimulates macrophage chemotaxis. However, the mechanisms regulating this function are unknown. Hyaluronan (HA) and its receptors RHAMM (receptor for HA- mediated motility, CD168) and CD44 also regulate cell migration and inflammation. We therefore examined the role of HA, RHAMM, and CD44 in SPA-stimulated macrophage chemotaxis. Using antibody blockade and murine macrophages, SPA-stimulated macrophage chemotaxis was dependent on TLR2 but not the other SPA receptors examined. Anti-TLR2 blocked SPA-induced production of TGFβ. In turn, TGFβ1-stimulated chemotaxis was inhibited by HA-binding peptide and anti-RHAMM antibody but not anti-TLR2 antibody. Macrophages from TLR2−/− mice failed to migrate in response to SPA but responded normally to TGFβ1 and HA, effects that were blocked by anti-RHAMM antibody. Macrophages from WT and CD44−/− mice had similar responses to SPA, whereas those from RHAMM−/− mice had decreased chemotaxis to SPA, TGFβ1, and HA. In primary macrophages, SPA-stimulated TGFβ production was dependent on TLR2, JNK, and ERK but not p38. Pam3Cys, a specific TLR2 agonist, stimulated phosphorylation of JNK, ERK, and p38, but only JNK and ERK inhibition blocked Pam3Cys-stimulated chemotaxis. We have uncovered a novel pathway for SPA-stimulated macrophage chemotaxis where SPA stimulation via TLR2 drives JNK- and ERK-dependent TGFβ production. TGFβ1, in turn, stimulates macrophage chemotaxis in a RHAMM and HA-dependent manner. These findings are highly relevant to the regulation of innate immune responses by SPA with key roles for specific components of the extracellular matrix. 相似文献
9.
Seasonal breeder utilises photoperiod as environmental clue to adjust their energetically demanding phenomenon such as reproduction and immunity by the mechanism of trade-off. The photoperiodic modulation of melatonin (MT-1)-thyroid hormone receptor (TR-α), deiodinase (Dio-2) activity and its interrelationship with glucose transporters (GLUT-1&4) in lymphoid organ of seasonal breeder is lacking that may explain possible role of photoperiod and its relationship with the cell survival factors (Bcl-2) in spleen of golden hamster, Mesocricetus auratus. We reported that photoperiod regulates the circulatory melatonin and thyroid hormone levels. Short-day-induced melatonin can act via MT1 and may enhance the expressions of GLUT-1&4 thereby the energy and cell survival factor (Bcl-2) in spleen. On the other hand, long-day-induced thyroid hormone is converted to bioactive from (T-4 to T3) by action of Dio-2 that acts through TR-α to maintain minimum level of energy for immune responses. In conclusion, present result explains the reason behind the basic molecular events involved in trade-offs mechanism in seasonal variation of immune responses. 相似文献
10.
Law SH Redelings BD Kullman SW 《Journal of experimental zoology. Part B. Molecular and developmental evolution》2012,318(1):35-49
The availability of multiple teleost (bony fish) genomes is providing unprecedented opportunities to understand the diversity and function of gene duplication events using comparative genomics. Here we examine multiple paralogous genes of γ-glutamyl transferase (GGT) in several distantly related teleost species including medaka, stickleback, green spotted pufferfish, fugu, and zebrafish. Through mining genome databases, we have identified multiple GGT orthologs. Duplicate (paralogous) GGT sequences for GGT1 (GGT1 a and b), GGTL1 (GGTL1 a and b), and GGTL3 (GGTL3 a and b) were identified for each species. Phylogenetic analysis suggests that GGTs are ancient proteins conserved across most metazoan phyla and those paralogous GGTs in teleosts likely arose from the serial 3R genome duplication events. A third GGTL1 gene (GGTL1c) was found in green spotted pufferfish; however, this gene is not present in medaka, stickleback, or fugu. Similarly, one or both paralogs of GGTL3 appear to have been lost in green spotted pufferfish, fugu, and zebrafish. Syntenic relationships were highly maintained between duplicated teleost chromosomes, among teleosts and across ray-finned (Actinopterygii) and lobe-finned (Sarcopterygii) species. To assess subfunction partitioning, six medaka GGT genes were cloned and assessed for developmental and tissue-specific expression. On the basis of these data, we propose a modification of the "duplication-degeneration-complementation" model of subfunction partitioning where quantitative differences rather than absolute differences in gene expression are observed between gene paralogs. Our results demonstrate that multiple GGT genes have been retained within teleost genomes. Questions remain, however, regarding the functional roles of multiple GGTs in these species. 相似文献
11.
R. Cini M. Sabat M. Sundaralingam M. C. Burla A. Nunzi G. Polidori 《Journal of biomolecular structure & dynamics》2013,31(3):633-637
Abstract The X-ray structures of the isomorphous Mg2+, Ca2+, Mn2+ and Co2+ complexes of ATP have been determined. The metal ions are wrapped in hexa-coordination by the α, β and γ phosphate groups of two ATP molecules thus blocking the interaction of the metal ions with the adenine base. A second metal ion which is fully hydrated, M(H2O)2+ 6, is engaged in a strong hydrogen bond with the γ phosphate group of ATP and suggests a possible step in facilitating the cleavage between the β and γ phosphates in phosphoryl transfer reactions. 相似文献
12.
13.
《Inorganica chimica acta》2001,312(1-2):7-14
The synthesis and spectroscopic characterization of new transition metal complexes containing the heterocyclic nitrogen ligand 4′-phenyl-2,2′:6′,2″-terpyridine are reported. Complexes of the [XM(CO)3(L)] type (M=Re(I), Mn(I), Mo(0), or W(0); X=Br or CO; and L=4′-phenyl-2,2′:6′,2″-terpyridine) were prepared by photosubstitution or by thermolytic reactions. Aspects of the IR, UV–Vis, proton NMR spectra and electrochemistry of the complexes are discussed. Special attention is given to the fact that the heterocyclic nitrogen ligand ph-tpy acts as a bidentate or terdentate chelate in complexes of this type and shows the fluxionality in the coordination. Correlations between redox potentials and spectroscopic measurements indicate the various interactions of the ligand and the metal center, and allow the evaluation of the metal–ligand back-donation. 相似文献
14.
Column‐scale oil flushing of a sandy loam contaminated with either Pb(II) (500 mg/kg Pb), PbSO4 (10,000 mg/kg Pb), PbCO3 (10,000 mg/kg Pb), or Pb‐naphthalene (400 mg/kg Pb, 333 mg/kg naphthalene) was investigated. HCl (0.1 N), EDTA (0.01 M), and CaCl2 (1.0 M) were selected as the soil‐flushing solutions based on soil‐washing experiments. For the Pb‐only tests, Pb removal efficiencies were 85, 100, and 78% for HCl, EDTA, and CaCl2, respectively. For PbSO4 (s), Pb removal efficiencies were 32, 100, and 96% for HCl, EDTA, and CaCl2, respectively, and for PbCO3 were 97, 100, and 14% for HCl, EDTA, and CaCl2, respectively. Larger amounts of flushing solutions were required for the remediation of PbSO4‐and PbCO3‐contaminated soils compared with the Pb‐only tests, most likely because of slower dissolution kinetics and the neutralization of HCl by CO3 ‐2 For Pb‐naphthalene, Pb removal efficiencies were 78 and 72% for HCl and EDTA, respectively, which compared well with soil‐washing results but were less than those observed in Pb‐only column studies. 相似文献
15.
Marie-Claude Fulchignoni-Lataud Josiane Szpirer Göran Levan Mary C. Weiss 《Mammalian genome》1992,3(1):42-45
The chromosomal localization of four genes which are expressed mainly in the liver has been undertaken for the rat. Using a panel of hybrid clones segregating rat chromosomes, and Southern blot analysis, 1-AT (PI), PEPCK, ADH and FDP are assigned to rat Chromosomes (Chr) 6, 3, 2 and 17, respectively. Groups of synteny among rat, mouse and human species are discussed in relationship to the new assignments. 相似文献
16.
17.
T T Herskovits P A Blake J A Gonzalez M G Hamilton J S Wall 《Comparative biochemistry and physiology. B, Comparative biochemistry》1989,94(2):415-421
1. The hemocyanins of the Melongenidae family of marine gastropods: Melongena corona, Busycon canaliculatum, B. carica, B. contrarium, and B. spiratum exist in solution as multi-decameric aggregates characterized by sedimentation coefficients of approximately 105 S, 130 S, 150 S, 170 S, and higher values, corresponding to di-, tri-, tetra-, penta-, and larger multi-decameric particles. 2. The hemocyanins of B. contrarium and B. carica seem to form the largest decameric aggregates with the tri- to penta-decamers respresenting the major constitutents. Scanning transmission electron microscopy (STEM), both of unstained, freeze-dried and negatively-stained specimens, shows the presence of discrete aggregates consisting of up to ten decameric units. 3. The particle masses as determined by STEM mass measurements for individual molecules gave integral multiples of from 4.2 x 10(6) to 4.4 x 10(6) daltons ranging from about 8.2 x 10(6) daltons for the typical di-decamer of B. canaliculatum hemocyanin to as high as about 39 x 10(6) and 43 x 10(6) for the nano-and deca-decamers of B. contrarium hemocyanin. 4. The appearance of the higher multi-decamers in both negatively-stained and freeze-dried specimens suggest that they are formed by the addition of decameric units to a single di-decameric unit "tail-wise" in both directions. The higher aggregates formed seem to terminate with a closed head or collar at both ends of the assembly. 相似文献
18.
19.
Keiko Tanaka Ken-Ichi Iyama Mitsuhiko Kitaoka Yoshifumi Ninomiya Toshitaka Oohashi Yoshikazu Sado Tomomichi Ono 《Journal of molecular histology》1997,29(7):563-570
Type IV collagen, the major component of basement membrane, consists primarily of ·1(IV) and ·2(IV) chains. Recently, other
types of collagen IV chains, i.e. ·3(IV), ·4(IV), ·5(IV) and ·6(IV) chains, have been identified by protein chemistry and
molecular cloning. We have examined the diversity of the assembly of ·(IV) chains of the basement membrane surrounding tumour
nests of basal cell carcinomas, in tissues from 11 patients, by immunohistochemical analysis using specific monoclonal antibodies
to six ·(IV) chain. The immunostaining profile of each chain differed with respect to the histological subtypes of basal cell
carcinoma. In the morphea-like subtype, which was more invasive, ·1(IV) and ·2(IV) chains were discontinuously stained, and
·5(IV) and ·6(IV) chains were entirely absent. However, in the superficial subtype, which was non-aggressive, ·1(IV), ·2(IV),
·5(IV) and ·6(IV) chains were well stained compared with the other subtypes of basal cell carcinoma. In addition, in the solid
subtype, which showed slow growth and ulceration, ·1(IV) and ·2(IV) chains were continuously stained, and ·5(IV) and ·6(IV)
chains were discontinuous or absent. The assembly of ·5(IV) and ·6(IV) chains into the basement membrane was inhibited in
the solid and morphea subtypes of BCC. This differential expression of type IV collagen chains seems to be associated with
the invasive potential of basal cell carcinoma
This revised version was published online in November 2006 with corrections to the Cover Date. 相似文献
20.
Wang L Liu QM Sung BH An DS Lee HG Kim SG Kim SC Lee ST Im WT 《Journal of biotechnology》2011,156(2):125-133
A new β-glucosidase gene (bglSp) was cloned from the ginsenoside converting Sphingomonas sp. strain 2F2 isolated from the ginseng cultivating filed. The bglSp consisted of 1344 bp (447 amino acid residues) with a predicted molecular mass of 49,399 Da. A BLAST search using the bglSp sequence revealed significant homology to that of glycoside hydrolase superfamily 1. This enzyme was overexpressed in Escherichia coli BL21 (DE3) using a pET21-MBP (TEV) vector system. Overexpressed recombinant enzymes which could convert the ginsenosides Rb1, Rb2, Rc and Rd to the more pharmacological active rare ginsenosides gypenoside XVII, ginsenoside C-O, ginsenoside C-Mc1 and ginsenoside F2, respectively, were purified by two steps with Amylose-affinity and DEAE-Cellulose chromatography and characterized. The kinetic parameters for β-glucosidase showed the apparent Km and Vmax values of 2.9 ± 0.3 mM and 515.4 ± 38.3 μmol min−1 mg of protein−1 against p-nitrophenyl-β-d-glucopyranoside. The enzyme could hydrolyze the outer C3 glucose moieties of ginsenosides Rb1, Rb2, Rc and Rd into the rare ginsenosides Gyp XVII, C-O, C-Mc1 and F2 quickly at optimal conditions of pH 5.0 and 37 °C. A little ginsenoside F2 production from ginsenosides Gyp XVII, C-O, and C-Mc1 was observed for the lengthy enzyme reaction caused by the side ability of the enzyme. 相似文献