scholarly journals Isolasi dan Identifikasi Mikroba Berpotensi Pendegradasi Limbah Cair Laboratorium Kesehatan STIKes Maharani Malang

2019 ◽  
Vol 5 (1) ◽  
pp. 38-44
Author(s):  
Erni Yohani Mahtuti ◽  
Farahdita Devi Masyitoh
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Proteus Mirabilis ◽  
Liquid Waste ◽  
Pseudomonas Stutzeri ◽  
Biochemical Test ◽  
Purposive Sampling ◽  
Gram Staining ◽  
Degrading Bacteria ◽  
Pure Cultures ◽  
Laboratory Waste

Laboratory waste produced unique characteristics, contrast to waste produced by industrial activities. Material waste that comes from the laboratory has greater variety of waste types; although the amount of material discarded is not many. The research objective was to obtain bacterial isolates that were able to survive in laboratory waste as potential waste-degrading bacteria. Research method is observartional laboratory with isolate reaction testing that was detected by the ability to degrade starch, cellulose, proteins and non-organic compounds. The sampling method was purposive sampling. The stages in this study were divided into two; first, the manufacture of pure cultures from the inoculants previously diluted, then microscopic observations. The second, identification and biochemical test according to Bergey's Manual of Bacteriology Determination. Bacteria were rejuvenated on medium nutrient so that the isolates were obtained twenty four hours old. Then an examination was carried out include Gram staining. Enzymatic test of amylase, protease, and cellulose, and biochemical test to identify microbes that degrade chemical compounds includes; oxidase test, motility, nitrate, lysine, ornithine, H2O, Glucose, Mannitol, xylose, ONPG, Indole, urease, V-P, citrate, TDA. The results of the study were found Pseudomonas stutzeri, Proteus mirabilis, and Pseudomonas aeruginosa. Isolates that have an amylolytic index are C1, C2 and O7 namely Pseudomonas stutzeri, Proteus mirabilis, and Pseudomonas aeruginosa. The resulting index was C1 = 0.45, C2 = 0.65 and O7 = 0.87. Keywords: Isolation, identification, laboratory liquid waste, waste degradation microbes ABSTRAK Limbah laboratorium menghasilkan karakteristik yang unik, kontras dengan limbah yang dihasilkan oleh kegiatan industri. Limbah bahan yang berasal dari laboratorium memiliki jenis sampah yang lebih banyak, meskipun jumlah bahan yang dibuang tidak banyak. Tujuan penelitian adalah untuk memperoleh isolat bakteri yang mampu bertahan hidup di dalam limbah laboratorium sebagai bakteri pengurai limbah potensial. Metode penelitian adalah observasional laboratorium dengan melakukan tes reaksi isolat untuk mengetahui kemampuan degradasi pati, selulosa, protein dan senyawa non-organik. Teknik pengambilan sampel adalah purposive sampling. Tahapan dalam penelitian ini dibagi menjadi dua yaitu pertama, pembuatan kultur murni dari inokulan yang sebelumnya diencerkan, kemudian pengamatan mikroskopis. Kedua, identifikasi dan uji biokimia sesuai dengan Manual Penentuan Bakteriologi Bergey. Bakteri diremajakan pada nutrisi sedang sehingga isolat diperoleh dalam dua puluh empat jam. Uji pemeriksaan adalah pewarnaan Gram. Selanjutnya uji enzimatik amilase, protease, dan selulosa, dan uji biokimia untuk mengidentifikasi mikroba yang mendegradasi senyawa kimia meliputi; uji oksidase, motilitas, nitrat, lisin, ornithine, H2O, Glukosa, Mannitol, xilosa, ONPG, Indole, urease, V-P, sitrat, TDA. Hasil penelitian ditemukan Pseudomonas stutzeri, Proteus mirabilis, dan Pseudomonas aeruginosa. Isolat yang memiliki indeks amilolitik adalah C1, C2 dan O7 yaitu Pseudomonas stutzeri, Proteus mirabilis, dan Pseudomonas aeruginosa. Indeks yang dihasilkan adalah C1 = 0,45, C2 = 0,65 dan O7 = 0,87. Kata kunci: Isolasi dan identifikasi mikroba, Limbah cair laboratorium, mikroba pendegradasi limbah

scholarly journals Isolation and Identification of Bacteria Responsible for the Spoilage of Fluted Pumpkin (Telfaria occidentalis) and Bitter Leaf (Vernonia amygdalina) in Sokoto Metropolis

2021 ◽  
pp. 372-378
Author(s):  
A.S. Muhammad ◽  
S.A. Ani ◽  
A.M. Nasiru
Keyword(s):  
Proteus Mirabilis ◽  
Biochemical Test ◽  
Gram Stain ◽  
Vernonia Amygdalina ◽  
Isolation And Identification ◽  
E Coli ◽  
Percentage Distribution ◽  
Fluted Pumpkin ◽  
Urease Test ◽  
Pure Cultures

The research was conducted in 2016 at the Microbiology Laboratory in the Department of Microbiology in Usmanu Danfodiyo University Sokoto. The main objective was to isolate and identify those bacteria responsible for the spoilage of bitter leaf (Vernonia amygdalina) and fluted pumpkin (Telfairia occidentalis). This approach presented extracting these bacteria form the vegetables and then culture then on agar plates, colonies were formed and subcultures on different plates, pure cultures were obtained and cultured in slant bottles containing nutrient agar for identification through biochemical test bacterial utilization of substrates which include Triple sugar ion, Methyl red and Vogues prosturer test, starch hydrolysis, Indole, citrate, catalase, urease test and recorded. Gram stain was carried out to identify the gram reaction and viewed under microscope for cell morphology. Bacteria species of the stock culture were identified using Atlas Book of Bacteria using the biochemical test results and gram stain reactions, the bacteria isolated were identified as gram negative rod bacteria. Percentage distribution of occurrence showed that E. coli had had the highest frequency of occurrence with percentage distribution of 42.8% in bitter leaf, followed by Proteus mirabilis, and B. cereus both having 28.6% respectively. Proteus mirabilis had 50% in fluted pumpkin, Klebsiella 33.3%, E. coli 16.7%. From the result, it was concluded that E. coli and Proteus had the highest occurrence of bacterial contamination of spoilt bitter leaf and fluted pumpkin sold in Sokoto metropolis and recommended sensitization proper hygienic measure during post-harvest handling of these vegetables. KEYWORDS: Isolation, Identification, Bacteria, Vegetables, Food Spoilage, Hygiene

Biodegradation of tobacco waste by composting: Genetic identification of nicotine-degrading bacteria and kinetic analysis of transformations in leachate

2012 ◽  
Vol 66 (12) ◽  
Author(s):  
Felicita Briški ◽  
Nina Kopčić ◽  
Ivana Ćosić ◽  
Dajana Kučić ◽  
Marija Vuković
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Liquid Waste ◽  
Genetic Identification ◽  
Airflow Rate ◽  
Degrading Bacterium ◽  
Half Saturation Constant ◽  
Degrading Bacteria ◽  
Bacterium Strain ◽  
Monod Kinetic ◽  
Tobacco Waste

AbstractThe tobacco industry produces large quantities of solid and liquid waste. This waste poses a significant environmental problem, as some major components are harmful and toxic. The aim of this work is to isolate and identify the nicotine-degrading microorganisms in the composting of tobacco waste. The bioremediation process for the detoxification of waste was carried out in a column reactor at an airflow-rate of 0.4 L min−1 kg−1. The concentrations of nicotine and number of CFU in the samples taken from reactor were monitored over nineteen days. After nineteen days, 89.8 % of nicotine conversion was obtained. A nicotine-degrading bacterium, strain FN, was isolated from the composting mass and identified as Pseudomonas aeruginosa on the basis of morphology, 16S rDNA sequence, and the phylogenetic characteristics. To confirm that the isolated Pseudomonas aeruginosa FN is the actual nicotine degrader, batch experiments were performed using tobacco leachate. It was confirmed that the strain FN possesses a considerable capacity to degrade nicotine with simultaneous COD removal. The Monod kinetic model for single substrate was applied to obtain the substrate degradation rate and half saturation constant.

scholarly journals ISOLASI BAKTERI DARI TANAH TEMPAT PEMBANGAN AKHIR (TPA) AIR SEBAKUL SEBAGAI AGEN BIODEGRADASI LIMBAH PLASTIK POLYETHYLENE

Alotrop ◽  
2020 ◽  
Vol 4 (2) ◽  
pp. 98-106
Author(s):  
Desy Purnama Sari ◽  
Hermansyah Amir ◽  
Rina Elvia
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Bacterial Isolate ◽  
Morphological Characteristics ◽  
Bacterial Isolation ◽  
Gram Staining ◽  
Chemistry Learning ◽  
Degrading Bacteria ◽  
Identification Of Bacteria ◽  
Time Variations

This study aims to obtain the bacteria of Pseudomonas from the land of TPA Air Sebakul Bengkulu City as a plastic degrading agent and measure the ability of bacteria to degrade Low Density Polyethylene (LDPE) and Oxium plastic. The research was conducted from February to August 2019, at the Laboratory of Biology and Chemistry Learning, Faculty of Teacher Training and Education, University of Bengkulu. Air Sebakul landfill samples were taken at the coordinate point 3o49 '27.8 "S 102o20 '48.4" E. Isolation of plastic degrading bacteria using selective media King's B Agar added with 2% Polyethylen Glycol (PEG) to test the ability to develop bacterial isolates in plastic-based media. The steps of this research are bacterial isolation, bacterial purification and bacterial selection, macroscopic and microscopic identification of bacteria (Gram staining) and plastic biodegradation test with Mineral Salt Agar (MSM) media. Determination of the% weight loss of LDPE and oxium plastics in the biodegradation process was carried out for 30 days with time variations of 10, 20 and 30 days. The results of bacterial isolation based on morphological characteristics and gram staining test of P-1 bacterial isolate have similarities with Pseudomonas aeruginosa. So that the P-1 bacterial isolate is thought to be a Pseudomonas aeruginosa bacterium. The bidoegradation of LDPE and oxium plastics with isolates of P-1 bacteria for 10, 20 and 30 days respectively was able to degrade oxium plastics by 2.43, 5.17 and 9.86% while LDPE plastics by 1.13, 2 and 1 , 17%.

scholarly journals Estudo etiológico da infecção do trato urinário em cães

1995 ◽  
Vol 32 (1) ◽  
pp. 31 ◽  
Author(s):  
Marcia Mery Kogika ◽  
Vera Assunta Batistini Fortunato ◽  
Elsa Masae Mamizuka ◽  
Mitika Kuribayashi Hagiwara ◽  
Maria de Fatima Borges Pavan ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Pseudomonas Aeruginosa ◽  
Proteus Mirabilis ◽  
Enterobacter Cloacae ◽  
Citrobacter Freundii ◽  
Providencia Rettgeri ◽  
Cocker Spaniel

Foram estudados 51 casos de infecção urinária, em cães, considerando-se diversos fatores, tais como: agente etiológico, localização da infecção, fatores predisponentes, sexo, idade e raça. O diagnóstico da infecção do trato urinário (ITU) foi baseado no exame bacteriológico, sendo considerado positivo quando a amostra de urina, colhida com auxílio de cateter, apresentava acima de 105 bactérias/ml. Dos animais examinados, quatro cães apresentaram infecção mista, totalizando 55 microorganismos isolados. Escherichia coli foi a mais freqüentemente isolada (35,3%), seguida de Staphylococcus sp (23,5%), Proteus mirabilis (15,7%), Streptococcus sp (13,7%), Klebsiella sp (9,8%), Pseudomonas aeruginosa (3,9%), Enterobacter cloacae (2.0%), Citrobacter freundii (2.0%) e Providencia rettgeri (2,0%). Quanto à sensibilidade dos germes isolados frente a diversos agentes antimicrobianos, a norfloxacina e a gentamicina mostraram-se eficazes no tratamento de microorganismos Gram-negativos, enquanto a cefalotina e a nitrofurantoina foram mais eficazes contra bactérias Gram-positivas. Os animais que apresentaram maior frequência de ITU pertenciam às raças Cocker Spaniel e Pastor Alemão, envolvendo mais machos do que fêmeas com predominância de pielonefrites. Embora as infecções urinárias tivessem sido observadas em todas as idades, houve um predomínio nos cães de média idade. Observou-se ainda que a urolitíase foi um fator pré-disponente ou adjacente de ITU, envolvendo germes como Staphylococcus sp. e Proteus mirabilis naqueles casos com pH urinário alcalino.

scholarly journals Efeito antimicrobiano do extrato de Cranberry sobre micro-organismos causadores de infecção urinária

2016 ◽  
Vol 11 (31) ◽  
pp. 113-122
Author(s):  
Carla Franco Porto Belmont Souza ◽  
Luiz Eduardo Souza da Silva Irineu ◽  
Renan Silva De Souza ◽  
Renato da Silva Teixeira ◽  
Ivina Sanches Pereira ◽  
...  
Keyword(s):  
Escherichia Coli ◽  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Klebsiella Pneumoniae ◽  
Enterococcus Faecalis ◽  
Proteus Mirabilis ◽  
Enterococcus Faecium ◽  
Vaccinium Macrocarpon ◽  
Mueller Hinton

A resistência microbiana tem se mostrado um problema de proporções mundiais, causando estado de morbidade e mortalidade em diversos pacientes. Em vista disso, tem crescido a busca por métodos alternativos naturais de profilaxia. A investigação clínica sugere que o Extrato de Cranberry está entre as melhores propostas de prevenção natural. O Cranberry (Vaccinium macrocarpon) é um fruto que tem crescido comercialmente pelo sabor e propriedades benéficas à saúde. Dentre as formas comercializadas estão: o suco, o chá e as cápsulas contendo o extrato seco. A ação desta planta está relacionada ao tratamento de doenças do trato urinário, por possuir substâncias que inibem a adesão bacteriana ao epitélio do trato urinário, dificultando sua proliferação e reprodução. Dentre todas as infecções relacionadas à assistência a saúde, a Infecção do Trato Urinário é a mais frequentemente associada a procedimentos invasivos. Se não for tratada, pode resultar em complicações como pielonefrite aguda, bacteremia e pionefrose. Portanto, cranberry pode ser uma nova alternativa para o combate das infecções uroepiteliais, por ser um produto natural de preço acessível, e com formas de comercialização diversificada, ao contrário dos antimicrobianos convencionais, que por sua vez são caros e podem acabar causando resistência nos micro-organismos. Este trabalho teve como objetivo avaliar in vitro a atividade antimicrobiana do extrato de Cranberry, adquirido em farmácia de manipulação, sobre 8 micro-organismos isolados de infecções urinárias. As cepas utilizadas, adquiridas da coleção da FIOCRUZ, foram: Escherichia coli, Pseudomonas aeruginosa, Klebsiella pneumoniae, Proteus mirabilis, Serratia marscecens, Staphylococcus aureus, Enterococcus faecalis e Enterococcus faecium. No estudo, foram utilizados o caldo Mueller Hinton (MH), Extrato de Cranberry e as bactérias patogênicas. O ensaio foi realizado em triplicata, com o uso de um controle de crescimento dos micro-organismos e o experimento para avaliação do crescimento bacteriano na presença do extrato. A turbidez foi medida com o auxílio de um espectrofotômetro, no comprimento de onda de 600 nm, antes e após 24 horas de incubação à 37 ºC. O procedimento forneceu a Densidade Ótica, do qual possibilitou a identificação da inibição microbiana. Para análise estatística foi utilizado o Teste t de Student. O Extrato de Cranberry apresentou atividade antimicrobiana sobre as bactérias Staphylococcus aureus, Klebsiella pneumoniae, Escherichia coli, Serratia marscecens e Enterococcus faecalis (p < 0,05), confirmando seu efeito benéfico em infecções urinárias. No entanto, não teve efeito inibitório significativo sobre Pseudomonas aeruginosa, Proteus mirabilis e Enterococcus faecium (p > 0,05).

scholarly journals PREVALÊNCIA DE MICRORGANISMOS EM BANDEJAS UTILIZADAS PELA ENFERMAGEM NA ADMINISTRAÇÃO DE MEDICAMENTOS EM AMBIENTE HOSPITALAR

2020 ◽  
Vol 3 (2) ◽  
pp. 24
Author(s):  
Cristiane Güths da Silva De Freitas ◽  
Keli Jaqueline Staudt ◽  
Kelly Helena Khün ◽  
Izabel Almeida Alves ◽  
Maria Cristina Meneghete
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Klebsiella Oxytoca ◽  
Pseudomonas Stutzeri ◽  
Rio Grande ◽  
Rio Grande Do Sul ◽  
Enterobacter Agglomerans ◽  
De Se

<p><strong>Introdução:</strong> Os hospitais constituem importante fonte de infecções, pois, abrigam uma vasta gama de microrganismos, principalmente bactérias. A limpeza e desinfecção de superfícies em ambientes hospitalares são subsídios elementares e eficazes como medidas de controle para romper a cadeia epidemiológica das infecções. <strong>Objetivo</strong>: Verificar a prevalência de microrganismos em bandejas utilizadas pela enfermagem para a administração de medicamentos em ambiente hospitalar, através do crescimento dos mesmos por técnicas microbiológicas. <strong>Métodos:</strong> Trata-se de uma pesquisa do tipo transversal, de prevalência, com abordagem quantitativa realizada em um hospital de médio porte da região Noroeste do Estado do Rio Grande do Sul, no segundo semestre de 2015. A coleta das amostras se deu por meio da técnica de swab, que consistiu em deslizar um swab na superfície das bandejas utilizadas para a administração dos medicamentos. Para a análise dos dados foi realizada a pesquisa microbiológica e utilizada a estatística descritiva mediante a distribuição da frequência. <strong>Resultados:</strong> Os microrganismos isolados foram: <em>Staphylococcus </em>coagulase negativa, <em>Acinetobacter baumanni</em>,  <em>Enterobacter agglomerans</em>, <em>Klebsiella oxytoca, Klebsiella ozaenae</em>, <em>Staphylococcus aureus</em>, <em>Acinetobacter lwoffii, Pseudomonas stutzeri, </em><em>Pseudomonas aeruginosa</em>. <strong>Conclusão:</strong> Demonstrando a importância de se realizar os processos de higienização correta das mãos, dos materiais, dos utensílios, dentre outras, como forma possível de reduzir a transferência de patógenos entre profissionais, pacientes e ambiente.</p>

scholarly journals Pola kuman dari infeksi luka operasi pada pasien multitrauma

2017 ◽  
Vol 9 (2) ◽  
Author(s):  
Sidhit Barung ◽  
Heber B. Sapan ◽  
Winfrid M. Sumanti ◽  
Rudy Tubagus
Keyword(s):  
Escherichia Coli ◽  
Pseudomonas Aeruginosa ◽  
Proteus Mirabilis ◽  
Bacteroides Fragilis ◽  
Enterobacter Cloacae ◽  
Alcaligenes Faecalis ◽  
Cross Sectional ◽  
Enterobacter Hormaechei ◽  
Cross Sectional Design ◽  
Pcr Test

Abstract: Surgical site infection (SSI) is the main surgery complication which can increase morbidity, mortality, as well as the hospital cost. The prevalence of SSIs at a health care reflects its sevice quality. This study was aimed to obtain the bacterial profile of SSIs among multitraumatic patients at Prof. Dr. R. D. Kandou Hospital from June through December 2016. This was a descriptive study with a cross sectional design. Pus was obtained from SSIs of laparotomy and ORIF operation wounds, and was further examined with PCR. The results showed that of 16 samples, 3 samples were negative (18.75%) and 13 samples were positive (81.25 %). The PCR test showed that the highest percentage of bacteria was Pseudomonas aeruginosa (6 samples; 46.1%), followed by Escherichia coli (2 samples; 15.4%), and Enterobacter hormaechei, Alcaligenes faecalis, Enterobacter cloacae, Bacteroides fragilis as well as Proteus mirabilis (each of 1 sample; 7.7%). Conclusion: Based on the PCR test, there were 7 types of bacteria at the SSIs of multitraumatic patients at Prof. Dr. R. D. Kandou Hospital Manado, all of them were Gram negative, and the most common type was Pseudomonas aeruginosa.Keywords: bacterial profile, PCR, SSIs, multitraumatic patientsAbstrak: Infeksi luka operasi merupakan salah satu komplikasi utama operasi yang dapat meningkatkan morbiditas, mortalitas, dan biaya perawatan penderita di rumah sakit. Angka kejadian infeksi luka operasi pada suatu institusi penyedia pelayanan kesehatan mencerminkan kualitas pelayanan pada institusi tersebut. Penelitian ini bertujuan untuk mendapatkan pola kuman infeksi luka operasi pada pasien multitrauma di ruang perawatan bedah RSUP Prof. Dr. R. D. Kandou selama bulan Juni-Desember 2016. Jenis penelitian ialah deskriptif dengan desain potong lintang. Apusan pus diambil dari luka operasi terinfeksi pada tindakan laparotomi dan ORIF kemudian diperiksa dengan PCR. Hasil penelitian memperlihatkan dari 16 sampel yang diteliti ditemukan 3 sampel negatif (18,75%) dan 13 sampel positif (81,25 %). Berdasarkan hasil PCR ditemukan pertumbuhan kuman terbanyak ialah Pseudomonas aeruginosa sejumlah 6 sampel (46,1%), diikuti Escherichia coli sejumlah 2 sampel (15,4%), serta Enterobacter hormaechei, Alkaligenes faecalis, Enterobacter cloacae, Bacteroides fragilis, dan Proteus mirabilis, masing-masing sejumlah 1 sampel (7,7%). Simpulan: Berdasarkan hasil PCR didapatkan 7 jenis kuman pada infeksi luka operasi dari pasien multitrauma di RSUP Prof. Dr. R. D. Kandou Manado, kesemuanya tergolong bakteri Gram negatif, dan yang tersering ialah Pseudomonas aeruginosa.Kata kunci: pola kuman, PCR, infeksi luka operasi, pasien multitrauma

Growth and enterotoxin B synthesis by Staphylococcus aureus S6 in associative growth with Pseudomonas aeruginosa

1973 ◽  
Vol 19 (10) ◽  
pp. 1197-1201 ◽  
Author(s):  
D. L. Collins-Thompson ◽  
B. Aris ◽  
A. Hurst
Keyword(s):  
Staphylococcus Aureus ◽  
Pseudomonas Aeruginosa ◽  
Sodium Chloride ◽  
Salt Tolerance ◽  
Second Growth ◽  
Growth System ◽  
Pure Cultures ◽  
Enterotoxin B ◽  
Membrane Type ◽  
And Staphylococcus Aureus

The interaction of Pseudomonas aeruginosa and Staphylococcus aureus S6 was studied in two systems. In the first system, the two organisms were grown together in a single flask. Growth of P. aeruginosa was unaffected, but growth of S. aureus was modified. After 24 h, 99.9% of the staphylococci population lost their salt tolerance when plated on media containing 7.5% sodium chloride, and enterotoxin B synthesis by S. aureus was diminished. In the second growth system, pure cultures of P. aeruginosa and S. aureus were grown in membrane-type spinner flasks. The growth and salt tolerance of S. aureus was again affected, but to a lesser degree. Cultures of S. aureus from these experiments recovered their salt tolerance in 6 h when transferred to fresh medium.Nutrient deficiency, lack of oxygen, or pigment production by the pseudomonads did not contribute significantly to loss of salt tolerance or inhibition of enterotoxin B synthesis, but a staphylolytic enzyme(s) isolated from P. aeruginosa was shown to be responsible for the loss of these properties.

scholarly journals Comparative Analysis of the Core Proteomes among the Pseudomonas Major Evolutionary Groups Reveals Species-Specific Adaptations for Pseudomonas aeruginosa and Pseudomonas chlororaphis

Diversity ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 289
Author(s):  
Marios Nikolaidis ◽  
Dimitris Mossialos ◽  
Stephen G. Oliver ◽  
Grigorios D. Amoutzias
Keyword(s):  
Pseudomonas Aeruginosa ◽  
Pseudomonas Syringae ◽  
Pseudomonas Stutzeri ◽  
Phylogenomic Analysis ◽  
Pseudomonas Chlororaphis ◽  
Phylogenetic Groups ◽  
The Core ◽  
Core Proteins ◽  
Core Proteome ◽  
Species Specific

The Pseudomonas genus includes many species living in diverse environments and hosts. It is important to understand which are the major evolutionary groups and what are the genomic/proteomic components they have in common or are unique. Towards this goal, we analyzed 494 complete Pseudomonas proteomes and identified 297 core-orthologues. The subsequent phylogenomic analysis revealed two well-defined species (Pseudomonas aeruginosa and Pseudomonas chlororaphis) and four wider phylogenetic groups (Pseudomonas fluorescens, Pseudomonas stutzeri, Pseudomonas syringae, Pseudomonas putida) with a sufficient number of proteomes. As expected, the genus-level core proteome was highly enriched for proteins involved in metabolism, translation, and transcription. In addition, between 39–70% of the core proteins in each group had a significant presence in each of all the other groups. Group-specific core proteins were also identified, with P. aeruginosa having the highest number of these and P. fluorescens having none. We identified several P. aeruginosa-specific core proteins (such as CntL, CntM, PlcB, Acp1, MucE, SrfA, Tse1, Tsi2, Tse3, and EsrC) that are known to play an important role in its pathogenicity. Finally, a holin family bacteriocin and a mitomycin-like biosynthetic protein were found to be core-specific for P. cholororaphis and we hypothesize that these proteins may confer a competitive advantage against other root-colonizers.

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