In this study, full-length CDS sequence of IGFBP-7 gene was cloned from Liangshan semi-fine wool sheep with RT-PCR method and analyzed with bioinformatics methods. The results showed that the full-length CDS sequence ...In this study, full-length CDS sequence of IGFBP-7 gene was cloned from Liangshan semi-fine wool sheep with RT-PCR method and analyzed with bioinformatics methods. The results showed that the full-length CDS sequence of IGFBP-7 gene in Liangshan semi-fine wool sheep was 846 bp in length, encoding 282 amino acids. The CDS sequence shared 99%, 95% and 90% homology with bovine, human and rat, respectively; the amino acid sequence shared 98%, 93% and 89%, respectively. The GenBank accession number was FJ589640.1. The amino acid molecular weight of IGFBP-7 was 29.0 kD, and the theoretical isoelec- tric point （pl） was 8.25. The result of phylogenetic analysis showed that IGFBP-7 gone in Liangshan semi-fine wool sheep exhibited close phylogenetic relationships with bovine, goat and other mammals, and distant phylogenetic relationships with Danio rerio and Haliotis diversicolor. IGFBP-7 gene had uniformly distributed hy- drophobic and hydrophilic regions, harboring one signal peptide, two transmembrane regions, 16 phosphorylation sites, four N-glycosylation sites and one O-glyco- sylation site. The result of secondary structure analysis showed that the random coil, or-helix and β-sheet regions accounted for 64.89%, 19.86% and 15.25%, respectively. The result of tertiary structure analysis showed that IGFBP-7 harbors an IGFBP_N domain and an Ig-like domain. This study provided scientific basis for further investigating the function of IGFBP-7 gene in sheep.展开更多
The insulin-like growth factor Ⅰ(IGF-Ⅰ) gene of triangular bream (Megalobrama terminalis)(GenBank No.AY247412)(Tb)was cloned for the first time from liver by RT-PCR. Thenucleotide sequence analysis showed the Tb IGF...The insulin-like growth factor Ⅰ(IGF-Ⅰ) gene of triangular bream (Megalobrama terminalis)(GenBank No.AY247412)(Tb)was cloned for the first time from liver by RT-PCR. Thenucleotide sequence analysis showed the Tb IGF-ⅠcDNA consisted of 486 nucleotides andencoded 117 amino acids including B, C, A, D and E five domains. Analysis of E-domainindicated that cloned Tb IGF-Ⅰbelonged to IGF-ⅠEa-2 subtype. Identity analysis showedthe IGF-Ⅰnucleotide sequence shared 99.8% homology with bluntnose bream, 88.8% withgrass carp, 85.8% with common carp; the pre-IGF-Ⅰamine acid sequence shared 99.4% withbluntnose bream, 88.8% with grass carp, 85.4% homology with common carp. In the CyprinusCarpio, the higher homology of nucleotide sequence and amino acid sequence in IGF-Ⅰshowed that the closer relationship the fishes have. These results could provide basicdata for the research on Tb germplasm and the development and utilization of biologicalfeed additives.展开更多
A novel mannose-bindlng aggiutinln was purified from bulbs of Zephyranthes candida Herb by extraction, precipitation with 80% （NH4）2SO4, and ion-exchange chromatography on DEAE-Sepharose followed by gel flitration o...A novel mannose-bindlng aggiutinln was purified from bulbs of Zephyranthes candida Herb by extraction, precipitation with 80% （NH4）2SO4, and ion-exchange chromatography on DEAE-Sepharose followed by gel flitration on Sephscryl S-100. The purified Z. candida agglutlnln （ZCA） migrated as a single band of 12 kDa on sodium dodecyi suifate-poiyecryiamide gel electrophoresis under reducing and non-reducing conditions. The apparent molecular mass of the iectln, as datermlned by gel filtration chromatography, was 48 kDa. The results Indicated that ZCA was composed of four Identical subunlts of 12 kDa each （homotetramerlc nature）. The ZCA agglutlhated rabbit erythrocytes, Escherichla coil and Saccharomyces cerevislae ceils at concentrations of 0.95, 1.90, and 31.30 μg/mL, respectively. Bloassays Indicated that ZCA has a significant effect on wheat aphid survival. Mortality after 7 d was 〉 90% at 0.26%. A degenerate primer was designed In accordance with the N-terminal partial sequence of purified ZCA. The full-length cDNA was cloned by 3＇- and 5＇-rapid amplification of cDNA ends. The full-length cDNA had 661 bp and the sequence encoded an open reading frame of 168 amino acids. The mature protein of ZCA Includes 109 amino acid residues and the molecular weight of the protein was 12.1 kDa. The result show that the zca gene encodes a protein precursor with a signal peptlde, a mature protein, and a C-terminal cleavage amino acids sequence. Molecular modeling of ZCA Indicated that Its three-dimensional atructure strongly resembies that of the snowdrop aggiutinin. Blocks＇ analysis revealed that the deduced amino acid sequence of ZCA has three functional domains specific for agglutination and three carbohydrate binding boxes （QDNY）.展开更多
INTRODUCTIONThe mechanism of hepatocellular carcinoma(HCC)is still unclear,although some genes have been found to play a role in the transformation of liver cells,and a variety of studies have described differences in...INTRODUCTIONThe mechanism of hepatocellular carcinoma(HCC)is still unclear,although some genes have been found to play a role in the transformation of liver cells,and a variety of studies have described differences in gene expression which distinguished tumor from nontumor[1-6].The new genes,especially the functional genes directly related with tumor are still worth being found.The purpose of our study is to find the different genes between human liver tumor and normal tissues using suppression subtractive hybridization.展开更多
To explore the prevalence of the plasmid-mediated quinolone resistance gene qnrA in Gram- negative bacteria and to investigate its molecular genetic background and resistance profile in isolates harboring this gene,a ...To explore the prevalence of the plasmid-mediated quinolone resistance gene qnrA in Gram- negative bacteria and to investigate its molecular genetic background and resistance profile in isolates harboring this gene,a total of 629 nalidixic acid-resistant isolates of non-repetitive Gram-negative bac- teria were collected from clinical specimens between April 2004 and April 2006 and these isolates were screened for qnrA gene by PCR using specific primers combined with DNA sequencing.The extended spectrumβ-lactamase(ESBL)or AmpC-producing isolates were distinguished by the phenotypic confir- matory test combined with DNA sequencing,and the antibiotics susceptibility test for qnrA-positive iso- lates was carried out by Kirby-Bauer and E-test method.To detect the location of the qnrA gene,plas- mid conjugation and Southern hybridization were performed and the integron structure containing the qnrA gene was cloned by PCR strategy and sequenced by primer walking.It was demonstrated that the incidence of the qnrA-positive strains in nalidixic acid-resistant bacteria was 1.9%(12/629),in which the detection rates for Klebiesiella pneumoniae.Enterobacter cloacae,Enterobacter aerogenes, Citrobacterfreundii and Salmonella choeraesuis were 2.2%(3/138),17.1%(6/35),9.1% (1/11),12.5%(1/8),and 14.3%(1/7),respectively.The qnrA gene was found to be embedded in the complex su/1-type integron located on plasmids with varied size(80-180 kb).Among them,4 qnrA-positive isolates carried integron In37 and 8 isolates carried a novel integron,temporarily desig- nated as InX.All the qnrA-positive isolates were ESBL-producing and transferable for the muhi-drug resistance.It is concluded that the plasmid-mediated drug-resistance mechanism exists in the quinolone resistant strains of isolates from hospitals in Guangdong area,but the incidence was rather low.Never- theless,it is still possible that the horizontal transfer of the resistant qnrA gene might lead to the spreading of drug-resistance.展开更多
基金Supported by Special Fund for Agro-scientific Research in the Public Interest from the Ministry of Agriculture(201003061)Key Project of Livestock and Poultry Breeding of Sichuan Province(01NG029-18)
文摘In this study, full-length CDS sequence of IGFBP-7 gene was cloned from Liangshan semi-fine wool sheep with RT-PCR method and analyzed with bioinformatics methods. The results showed that the full-length CDS sequence of IGFBP-7 gene in Liangshan semi-fine wool sheep was 846 bp in length, encoding 282 amino acids. The CDS sequence shared 99%, 95% and 90% homology with bovine, human and rat, respectively; the amino acid sequence shared 98%, 93% and 89%, respectively. The GenBank accession number was FJ589640.1. The amino acid molecular weight of IGFBP-7 was 29.0 kD, and the theoretical isoelec- tric point （pl） was 8.25. The result of phylogenetic analysis showed that IGFBP-7 gone in Liangshan semi-fine wool sheep exhibited close phylogenetic relationships with bovine, goat and other mammals, and distant phylogenetic relationships with Danio rerio and Haliotis diversicolor. IGFBP-7 gene had uniformly distributed hy- drophobic and hydrophilic regions, harboring one signal peptide, two transmembrane regions, 16 phosphorylation sites, four N-glycosylation sites and one O-glyco- sylation site. The result of secondary structure analysis showed that the random coil, or-helix and β-sheet regions accounted for 64.89%, 19.86% and 15.25%, respectively. The result of tertiary structure analysis showed that IGFBP-7 harbors an IGFBP_N domain and an Ig-like domain. This study provided scientific basis for further investigating the function of IGFBP-7 gene in sheep.
文摘The insulin-like growth factor Ⅰ(IGF-Ⅰ) gene of triangular bream (Megalobrama terminalis)(GenBank No.AY247412)(Tb)was cloned for the first time from liver by RT-PCR. Thenucleotide sequence analysis showed the Tb IGF-ⅠcDNA consisted of 486 nucleotides andencoded 117 amino acids including B, C, A, D and E five domains. Analysis of E-domainindicated that cloned Tb IGF-Ⅰbelonged to IGF-ⅠEa-2 subtype. Identity analysis showedthe IGF-Ⅰnucleotide sequence shared 99.8% homology with bluntnose bream, 88.8% withgrass carp, 85.8% with common carp; the pre-IGF-Ⅰamine acid sequence shared 99.4% withbluntnose bream, 88.8% with grass carp, 85.4% homology with common carp. In the CyprinusCarpio, the higher homology of nucleotide sequence and amino acid sequence in IGF-Ⅰshowed that the closer relationship the fishes have. These results could provide basicdata for the research on Tb germplasm and the development and utilization of biologicalfeed additives.
基金Supported by the National Natural Science Foundation of China （30000032）.
文摘A novel mannose-bindlng aggiutinln was purified from bulbs of Zephyranthes candida Herb by extraction, precipitation with 80% （NH4）2SO4, and ion-exchange chromatography on DEAE-Sepharose followed by gel flitration on Sephscryl S-100. The purified Z. candida agglutlnln （ZCA） migrated as a single band of 12 kDa on sodium dodecyi suifate-poiyecryiamide gel electrophoresis under reducing and non-reducing conditions. The apparent molecular mass of the iectln, as datermlned by gel filtration chromatography, was 48 kDa. The results Indicated that ZCA was composed of four Identical subunlts of 12 kDa each （homotetramerlc nature）. The ZCA agglutlhated rabbit erythrocytes, Escherichla coil and Saccharomyces cerevislae ceils at concentrations of 0.95, 1.90, and 31.30 μg/mL, respectively. Bloassays Indicated that ZCA has a significant effect on wheat aphid survival. Mortality after 7 d was 〉 90% at 0.26%. A degenerate primer was designed In accordance with the N-terminal partial sequence of purified ZCA. The full-length cDNA was cloned by 3＇- and 5＇-rapid amplification of cDNA ends. The full-length cDNA had 661 bp and the sequence encoded an open reading frame of 168 amino acids. The mature protein of ZCA Includes 109 amino acid residues and the molecular weight of the protein was 12.1 kDa. The result show that the zca gene encodes a protein precursor with a signal peptlde, a mature protein, and a C-terminal cleavage amino acids sequence. Molecular modeling of ZCA Indicated that Its three-dimensional atructure strongly resembies that of the snowdrop aggiutinin. Blocks＇ analysis revealed that the deduced amino acid sequence of ZCA has three functional domains specific for agglutination and three carbohydrate binding boxes （QDNY）.
文摘INTRODUCTIONThe mechanism of hepatocellular carcinoma(HCC)is still unclear,although some genes have been found to play a role in the transformation of liver cells,and a variety of studies have described differences in gene expression which distinguished tumor from nontumor[1-6].The new genes,especially the functional genes directly related with tumor are still worth being found.The purpose of our study is to find the different genes between human liver tumor and normal tissues using suppression subtractive hybridization.
文摘To explore the prevalence of the plasmid-mediated quinolone resistance gene qnrA in Gram- negative bacteria and to investigate its molecular genetic background and resistance profile in isolates harboring this gene,a total of 629 nalidixic acid-resistant isolates of non-repetitive Gram-negative bac- teria were collected from clinical specimens between April 2004 and April 2006 and these isolates were screened for qnrA gene by PCR using specific primers combined with DNA sequencing.The extended spectrumβ-lactamase(ESBL)or AmpC-producing isolates were distinguished by the phenotypic confir- matory test combined with DNA sequencing,and the antibiotics susceptibility test for qnrA-positive iso- lates was carried out by Kirby-Bauer and E-test method.To detect the location of the qnrA gene,plas- mid conjugation and Southern hybridization were performed and the integron structure containing the qnrA gene was cloned by PCR strategy and sequenced by primer walking.It was demonstrated that the incidence of the qnrA-positive strains in nalidixic acid-resistant bacteria was 1.9%(12/629),in which the detection rates for Klebiesiella pneumoniae.Enterobacter cloacae,Enterobacter aerogenes, Citrobacterfreundii and Salmonella choeraesuis were 2.2%(3/138),17.1%(6/35),9.1% (1/11),12.5%(1/8),and 14.3%(1/7),respectively.The qnrA gene was found to be embedded in the complex su/1-type integron located on plasmids with varied size(80-180 kb).Among them,4 qnrA-positive isolates carried integron In37 and 8 isolates carried a novel integron,temporarily desig- nated as InX.All the qnrA-positive isolates were ESBL-producing and transferable for the muhi-drug resistance.It is concluded that the plasmid-mediated drug-resistance mechanism exists in the quinolone resistant strains of isolates from hospitals in Guangdong area,but the incidence was rather low.Never- theless,it is still possible that the horizontal transfer of the resistant qnrA gene might lead to the spreading of drug-resistance.
基金Programfor New Century Excellent Talents in University(NCET-04-0746)the Region Technology Development Programof Chinese Ministry of Education(02095)+2 种基金the Natural Science Foundation of Hubei Province(2002AB094)the Youth Talent Foundation of Hubei Province(2003AB014)the Educational Office Key Research Programof Hubei Province(Z200627002)
