• Title/Summary/Keyword: sORF

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Functional Identification and Expression of Indole-3-Pyruvate Decarboxylase from Paenibacillus polymyxa E681

  • Phi, Quyet-Tien;Park, Yu-Mi;Ryu, Choong-Min;Park, Seung-Hwan;Ghim, Sa-Youl
    • Journal of Microbiology and Biotechnology
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    • v.18 no.7
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    • pp.1235-1244
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    • 2008
  • Indole-3-acetic acid (IAA) is produced commonly by plants and many bacteria, however, little is known about the genetic basis involving the key enzymes of IAA biosynthetic pathways from Bacillus spp. IAA intermediates from the Gram-positive spore-forming bacterium Paenibacillus polymyxa E681 were investigated, which showed the existence of only an indole-3-pyruvic acid (IPA) pathway for IAA biosynthesis from the bacterium. Four open reading frames (ORFs) encoding indole-3-pyruvate decarboxylase-like proteins and putative indole-3-pyruvate decarboxylase (IPDC), a key enzyme in the IPA synthetic pathway, were found on the genome sequence database of P. polymyxa and cloned in Escherichia coli DH5$\alpha$. One of the ORFs, PP2_01257, was assigned as probable indole-3-pyruvate decarboxylase. The ORF consisted of 1,743 nucleotides encoding 581 amino acids with a deduced molecular mass of 63,380 Da. Alignment studies of the deduced amino acid sequence of the ORF with known IPDC sequences revealed conservation of several amino acids in PP2_01257, essential for substrate and cofactor binding. Recombinant protein, gene product of the ORF PP2_01257 from P. polymyxa E681, was expressed in E. coli BL21 (DE3) as a glutathione S-transferase (GST)-fusion protein and purified to homogeneity using affinity chromatography. The molecular mass of the purified enzyme showed about 63 kDa, corresponding closely to the expected molecular mass of IPDC. The indole-3-pyruvate decarboxylase activity of the recombinant protein, detected by HPLC, using IPA substrate in the enzyme reaction confirmed the identity and functionality of the enzyme IPDC from the E681 strain.

Construction of Transformation Method for Streptomyces scabiei ATCC 49173 Producing Phytotoxin (식물독소를 생산하는 Streptomyces scabiei ATCC 49173의 형질전환법 구축)

  • Jang, Bo-Youn;Ha, Heon-Su;Choi, Sun-Uk
    • KSBB Journal
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    • v.25 no.2
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    • pp.167-172
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    • 2010
  • Streptomyces scabiei producing phytotoxin called thaxtomin, which cause scab disease on economically important crops such as potato. For molecular genetics study of S. scabiei an effective transformation method was established based on conjugal transfer from Escherichia coli ET12567 (pUZ8002) using a phiC31-derived integration vector, pSET152, containing oriT and attP fragments. The high frequency was obtained on MS medium containing 50 mM $MgCl_2$. In addition, the sequence and location of the chromosomal integration attB site of S. scabiei was identified for the first time in the strains producing thaxtomin by the southern blot analysis of exconjugants and the sequencing of plasmid containing DNA flanking the insertion sites from exconjugant chromosome. Similar to the case of Streptomyces species, a single phiC31 attB site of S. scabiei is present within an ORF encoding a pirin-homolog.

Genetic Organization of an Inducible ${\beta}$-Lactamase Gene Isolated from Chromosomal DNA of Staphylococcus aureus (Staphylococcus aureus에서 분리된 유발성 ${\beta}$-Lactamase 유전자의 유전적 구성)

  • Kim, Young-Sun;Min, Kyung-Il;Byeon, Woo-Hyeon
    • Korean Journal of Microbiology
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    • v.32 no.1
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    • pp.20-27
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    • 1994
  • An inducible ${\beta}$-lactamase gene (bla) was identified and isolated from the chromosomal DNA of multiple drug resistant strains of Staphylococcus aureus. Determined base sequence of bla and of its flanking region was compared with those of bla genes identified on the staphylococcal plasmids pPC1, pI258, pI1071, and pUB101. Base sequence of 843 base-long structural gene of our bla was same as that of pPCl-, pI258-, and pS1-bla. However, HindIII recognition site Which is found in most of the bla genes at 140 base upstream from the structural gene was moved to the site of 370 base upstream from the structural gene. And one of the two direct repeat sequence found in downstream flanking region of pI1071-bla was deleted in our bla. Amino acid sequence homology analysis of the ORF located around HindIII recognition site reveals that this 80 amino acids-long polypeptide is C-terminus of transposase of Tn4001.

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Cloning and Characterization of Monofunctional Catalase from Photosynthetic Bacterium Rhodospirillum rubrum S1

  • Lee, Dong-Heon;Oh, Duck-Chul;Oh, You-Sung;Malinverni, Juliana C.;Kukor, Jerome J.;Kahng, Hyung-Yeel
    • Journal of Microbiology and Biotechnology
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    • v.17 no.9
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    • pp.1460-1468
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    • 2007
  • In this study, an approx. 2.5-kb gene fragment including the catalase gene from Rhodospirillum rubrum S1 was cloned and characterized. The determination of the complete nucleotide sequence revealed that the cloned DNA fragment was organized into three open reading frames, designated as ORF1, catalase, and ORF3 in that order. The catalase gene consisted of 1,455 nucleotides and 484 amino acids, including the initiation and stop codons, and was located 326 bp upstream in the opposite direction of ORF1. The catalase was overproduced in Escherichia coli UM255, a catalase-deficient mutant, and then purified for the biochemical characterization of the enzyme. The purified catalase had an estimated molecular mass of 189 kDa, consisting of four identical subunits of 61 kDa. The enzyme exhibited activity over a broad pH range from pH 5.0 to pH 11.0 and temperature range from $20^{\circ}C$ to $60^{\circ}C$C. The catalase activity was inhibited by 3-amino-1,2,4-triazole, cyanide, azide, and hydroxylamine. The enzyme's $K_m$ value and $V_{max}$ of the catalase for $H_2O_2$ were 21.8 mM and 39,960 U/mg, respectively. Spectrophotometric analysis revealed that the ratio of $A_{406}$ to $A_{280}$ for the catalase was 0.97, indicating the presence of a ferric component. The absorption spectrum of catalase-4 exhibited a Soret band at 406 nm, which is typical of a heme-containing catalase. Treatment of the enzyme with dithionite did not alter the spectral shape and revealed no peroxidase activity. The combined results of the gene sequence and biochemical characterization proved that the catalase cloned from strain S1 in this study was a typical monofunctional catalase, which differed from the other types of catalases found in strain S1.

TC1 (C8orf4) is involved in ERK1/2 pathway-regulated G1- to S-phase transition

  • Wang, Yi-Dong;Bian, Guo-Hui;Lv, Xiao-Yan;Zheng, Rong;Sun, Huan;Zhang, Zheng;Chen, Ye;Li, Qin-Wei;Xiao, Yan;Yang, Qiu-Tan;Ai, Jian-Zhong;Wei, Yu-Quan;Zhou, Qin
    • BMB Reports
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    • v.41 no.10
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    • pp.733-738
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    • 2008
  • Although previous studies have implicated a role for TC1 (C8orf4) in cancer cell proliferation, the molecular mechanism of its action is still largely unclear. In this study, we showed, for the first time, that the mRNA levels of TC1 were upregulated by mitogens (FBS/thrombin) and at least partially, through the ERK1/2 signaling pathway. Interestingly, the over-expression of TC1 promoted the $G_1$- to S-phase transition of the cell cycle, which was delayed by the deficiency of ERK1/2 signaling in fibroblast cells. Furthermore, the luciferase reporter assay indicated that the over-expression of TC1 significantly increased Cyclin D1 promoter-driven luciferase activity. Taken together, our findings revealed that TC1 was involved in the mitogen-activated ERK1/2 signaling pathway and positively regulated $G_1$- to S-phase transition of the cell cycle. Our results may provide a novel mechanism of the role of TC1 in the regulation of cell proliferation.

Complete genome sequence of a novel bacteriophage SPG24 isolated from Cheonggukjang (청국장에서 분리된 신생 박테리오파지 SPG24의 전체 염기 서열)

  • Kim, Chaehyun;Lee, Gyu-Cheol;Kim, In Kyo;Kim, Seok Cheon;Lee, Oh Hyung;Lee, Chan Hee
    • Korean Journal of Microbiology
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    • v.53 no.2
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    • pp.144-145
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    • 2017
  • A Bacillus subtilis strain, designated G24, was isolated from grape during a study on the fermentation of Cheongkukjang, Korean traditional fast-fermented bean paste. Also, a newly isolated bacteriophage SPG24, which was found to inhibit the fermentation process, uses B. subtilis G24 as a host. The complete genome sequence of the bacteriophage SPG24 was 152,060 bp in length, with a G+C content of 42.2%. This sequence included 232 ORF; 58 forward ORFs and 174 reverse ORFs.

De-novo Hybrid Protein Design for Biodegradation of Organophosphate Pesticides

  • Awasthi, Garima;Yadav, Ruchi;Srivastava, Prachi
    • Microbiology and Biotechnology Letters
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    • v.47 no.2
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    • pp.278-288
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    • 2019
  • In the present investigation, we attempted to design a protocol to develop a hybrid protein with better bioremediation capacity. Using in silico approaches, a Hybrid Open Reading Frame (Hybrid ORF) is developed targeting the genes of microorganisms known for degradation of organophosphates. Out of 21 genes identified through BLAST search, 8 structurally similar genes (opdA, opd, opaA, pte RO, pdeA, parC, mpd and phnE) involved in biodegradation were screened. Gene conservational analysis categorizes these organophosphates degrading 8 genes into 4 super families i.e., Metallo-dependent hydrolases, Lactamase B, MPP and TM_PBP2 superfamily. Hybrid protein structure was modeled using multi-template homology modeling (3S07_A; 99%, 1P9E_A; 98%, 2ZO9_B; 33%, 2DXL_A; 33%) by $Schr{\ddot{o}}dinger$ software suit version 10.4.018. Structural verification of protein models was done using Ramachandran plot, it was showing 96.0% residue in the favored region, which was verified using RAMPAGE. The phosphotriesterase protein was showing the highest structural similarity with hybrid protein having raw score 984. The 5 binding sites of hybrid protein were identified through binding site prediction. The docking study shows that hybrid protein potentially interacts with 10 different organophosphates. The study results indicate that the hybrid protein designed has the capability of degrading a wide range of organophosphate compounds.

Gene Structure and Function of fkhE, a Forkhead Gene in a Filamentous Fungus Aspergillus nidulans (Aspergillus nidulans forkhead 유전자 fkhE의 구조와 기능 분석)

  • Park, Mi-Hye;Kim, Hyoun-Young;Kim, Jong-Hwa;Han, Kap-Hoon
    • The Korean Journal of Mycology
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    • v.38 no.2
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    • pp.160-166
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    • 2010
  • A homothallic filamentous fungus Aspergillus nidulans has been used as the a model organism for studying growth and development for eukaryotic system. Various studies about specific transcription factors have been performed for elucidating the molecular mechanisms of growth, asexual and sexual developmental processes. Among them, the fkhE gene (AN2025.3) is located in chromosome VII and contains an ORF encoding 718 amino acid polypeptide intervening with two short introns. The cDNA sequencing revealed that at least four types of alternative splicing events were occurred when the fkhE gene was transcribed. The putative FkhE polypeptide contains a conserved forkhead domain and a bipartite nuclear localization signal at it's N-terminus and C-terminus, respectively. Deletion of fkhE resulted in impaired conidiophore formation in a solid medium. However, the sexual developmental process or cleistothecia formation was normal. Furthermore, fkhE deletion mutant produced conidiophores and conidia under the submerged culture, indicating that the fkhE gene is involved in asexual developmental process similar to the fkhF gene.

Cloning and Characterization of a Gene Encoding $\gamma-Butyrolactone$ Autoregulator Receptor from Saccharopolyspora erythraea

  • LEE YONG-JIK;YEO SOO-HWAN;LEE IN SEON;LEE SAM-PIN;KITANI SHIGERU;NIHIRA TAKUYA;KIM HYUN SOO
    • Journal of Microbiology and Biotechnology
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    • v.16 no.1
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    • pp.77-83
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    • 2006
  • A gene encoding a $\gamma-butyrolactone$ autoregulator receptor was cloned from Saccharopolyspora erythraea, and the biochemical characteristics, including the autoregulator specificity, were determined with the purified recombinant protein. Using primers designed for the conserved amino acid sequence of Streptomyces $\gamma-butyrolactone$ autoregulator receptors, a 120 bp S. erythraea DNA fragment was obtained by PCR. Southern and colony hybridization with the 120 bp fragment as a probe allowed to select a genomic clone of S. erythraea, pESG, harboring a 3.2 kb SacI fragment. Nucleotide sequencing analysis revealed a 615 bp open reading frame (ORF), showing moderate homology (identity, $31-34\%$; similarity, $45-47\%$) with the $\gamma-butyrolactone$ autoregulator receptors from Streptomyces sp., and this ORF was named seaR (Saccharopolyspora erythraea autoregulator receptor). The seaR/pET-3d plasmid was constructed to overexpress the recombinant SeaR protein (rSeaR) in Escherichia coli, and the rSeaR protein was purified to homogeneity by DEAE-Sephacel column chromatography, followed by DEAE-ion-exchange HPLC. The molecular mass of the purified rSeaR protein was 52 kDa by HPLC gel-filtration chromatography and 27 kDa by SDS-polyacrylamide gel electrophoresis, indicating that the rSeaR protein is present as a dimer. A binding assay with tritium-labeled autoregulators revealed that rSeaR has clear binding activity with a VB-C-type autoregulator as the most effective ligand, demonstrating for the first time that the erythromycin producer S. erythraea possesses a gene for the $\gamma-butyrolactone$autoregulator receptor.

Cloning and Characterization of a new tobamovirus infecting Hibiscus rosa-sinensis

  • Srinivasan, L.K.G.;Wong, S.M.
    • Proceedings of the Korean Society of Plant Pathology Conference
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    • 2003.10a
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    • pp.125.3-126
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    • 2003
  • A near full-length sequence of a new tobamovirus infecting Hibiscus rosa-sinensis L. was determined. The genome consists of 58 nucleotides (nt) 5' UTR, followed by a 4.9 kb ORF which methyl transferase helicase domain (128 kDa), readthrough protein RNA dependent RNA polymerase (RdRp) 185 kDa and a 52 kDa protein. The 128 kDa protein had a maximum homology of 51.4 % to TMGMV and amino acids (an) were 54.3 % identical to TMV- vulgare strain. The 185 kDa RdRp had a maximum homology of 53.5% to TMV-Ob and KGMMV-Y and a 59.6% homology at the an level to CGMMV-SH. The MP gene encodes 282 aa and its theoretical molecular weight is 30.4 kDa. The nt and an sequence identities of MP ranged from 38.8% to 43.9% and 30.9% to 37.9%, respectively. The CP gene encodes 163 residues and with a theoretical molecular weight of 18.2 kDa The (nt) and aa sequences of the CP were 46.9 % to 51.6% and 45.3% to 57.1% identical to other tobamoviruses, respectively. The predicted virion origin of assembly (OAS) was located in the CP gene. Phylogenetic trees generated based on the nt and as sequences of RdRp, MP and CP genes indicated that this new virus clustered with subgroup II tobamoviruses. Although the CP ORF of this virus shared a high nt and aa sequence identity with Sunn-hemp mosaic virus (SHMV), Western analysis showed that it is serologically unrelated to SHMV. We propose the name Hibiscus virus S (HVS) for this Singapore isolate. This is the first report on a near full-length sequence of a Tobamovirus that infects hibiscus.

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