Functional efficiency of MerA protein among diverse mercury resistant bacteria for efficient use in bioremediation of inorganic mercury

Biochimie ◽  
2017 ◽  
Vol 142 ◽  
pp. 207-215 ◽  
Author(s):  
Hirak R. Dash ◽  
Mousumi Sahu ◽  
Bibekanand Mallick ◽  
Surajit Das
2011 ◽  
Vol 15 (1) ◽  
pp. 282 ◽  
Author(s):  
Fatimawali Fatimawali ◽  
Fatmawaty Badaruddin ◽  
Irawan Yusuf

ISOLASI DAN IDENTIFIKASI BAKTERI RESISTEN MERKURI DARI MUARA SUNGAI SARIO YANG DAPAT DIGUNAKAN UNTUK DETOKSIFIKASI LIMBAH MERKURI Fatimawali1), Fatmawaty Badaruddin2), Irawan Yusuf 2) 1)Dosen Fakultas  Kedokteran Unsrat Manado dan Mahasiswa Program Doktor Fakultas Kedokteran Universitas Hasanuddin Makassar; 2)Dosen Fakultas Kedokteran Universitas Hasanuddin Makassar ABSTRAK Merkuri adalah logam berat yang bersifat sangat toksik, mempunyai afinitas terhadap gugus thiol protein.  Keberadaan merkuri  dilingkungan, karena secara alamiah maupun karena aktifitas antrofogenik. Di Kabupaten Bolaang Mongondow terdapat beberapa penambang emas rakyat yang menggunakan merkuri untuk mengekstrak emas dari batuan atau ore dan membuang limbah merkuri secara bebas ke lingkungan dan terbawa air hujan sampai kepada perairan.  Sedimen perairan yang terkontaminasi merkuri dapat ditumbuhi bakteri resisten merkuri.  Bakteri resisten merkuri anorhanik dapat digunakan untuk bioremediasi perairan, karena bakteri tersebut mampu mereduksi merkuri anorganik menjadi logam merkuri yang mudah menguap dan kurangtoksik.  Dan merupakan sumber pencemaran merkuri.  Bakteri resisten merkuri mempunyai operon mer yang biasanya terkandung dalam plasmid.  Penelitian ini bertujuan untuk mengisolasi bakteri resisten merkuri anorganik, dan menganalisis kemampuannya dalam mereduksi HgCl2 dalam media nutrient broth.  Bakteri resisten merkuri tinggi, dilakukan analisis Gen 16S rRNAnya untuk mengetahuis pesiesnya.  Hasil penelitian menunjukkan bahwa isolat A1.1.1 merupakan bakteri spesies Klebsiella pneumoniae, mampu mereduksi HgCl2 75% dalam waktu 1 jam, 92% dalam waktu 12 jam dan 99,4%  dalam waktu 24 jam Kata Kunci: bakteri, detoksifikasi,  HgCl2,  Klebsiella pneumoniae   ISOLATION  AND  IDENTIFICATION OF MERCURY-RESISTANT BACTERIUM FROM SARIO RIVER ESTUARY THAT CAN BE USED TO DETOXIFY INORGANIK MERCURY WASTES ABSTRACT Mercury (Hg) is well known for its high toxicity and strong affinity toward the thiol group of proteins. When Hg released into the environment in substantial quantities through natural events and anthropogenic activities . In District of Bolaang Mongondow, many miners who are a source of mercury pollution of aquatic environments to which they use to extract gold from the rock or ore. Waters sediment contaminated with mercury, can be overgrown with microorganism such as bacteria that are resistant to mercury.  Mercury-resistant bacteria can be used for bioremediation of waters due to the ability of these bacteria to reduce toxic inorganic mercury into mercury metal which is volatile and less toxic. Mercury-resistant bacteria has mer Operon which usually contained in the plasmid.  The aim of this study was the selection of bacterial strains resistant to inorganic mercury, as well as to show their capacity to reduce mercury  in pure culture media Nutrient Broth. Twelve isolate bacteria was selected for its capacity to reduce mercury HgCl2 in culture media nutrient broth. The one bacterial strains belong to the spesies Klebsiella pneumoniae. Inoculated in pure culture, these strain showed a mercury reduction of 75% in 1 hour, 92% in 12 hours, and  99,4% in 24 hours. Keywords : bacteria , detoxification, HgCl2 ,  Klebsiella pneumoniae


2000 ◽  
Vol 42 (3-4) ◽  
pp. 109-114 ◽  
Author(s):  
M. Narita ◽  
C.C. Huang ◽  
T. Koizumi ◽  
T. Yamagata ◽  
G. Endo

To develop biotechnology for biological treatment of mercury-contaminated wastes or for bioremediation of mercury-polluted sites, mercury-resistant microorganisms have been isolated and characterized. However, understanding of the mercury resistance mechanism by anaerobic bacteria is lacking. In this study, we tried to isolate anaerobic mercury-resistant bacteria from mercury-polluted sediment in Minamata Bay, Japan. One strain of the bacterial isolates, designated Mersaru, was used for the identification and for the growth capability of mercurials. We also analyzed genetic characteristics of mercury resistance genes (merA and merB gene) from the strain Mersaru. The strain Mersaru, which was isolated from Minamata Bay sediment, was identified as Clostridium butyricum and showed resistance to both inorganic mercury and organomercurials. Furthermore, nucleotide sequence analysis showed that merA and merB genes of the strain Mersaru were identical to those of the B. cereus RC607 an aerobic mercury-resistant bacterium in the nucleotide sequence level. From the pulsed field gel electrophoresis analysis, it is suggest that the mer operon of the strain Mersaru is located on chromosomal DNA.


2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Terence Kanzil ◽  
Fatimawali . ◽  
Aaltje Manampiring

Abstract: Mercury is a toxic heavy metal that is used for dental fillings in the form of amalgam. To reduce the toxic effects produced by mercury, mercury resistant bacteria can be used. Bacillus sp is a gram-positive bacteria that is resistant to mercury. Besides having the mer operon genes that can transform Hg2+ to Hg0 that is less toxic, Bacillus sp bacteria also produce esterase that cause these bacteria resistant to erythromycin antibiotic. Erythromycin is a macrolide class of antibiotic used for the treatment of diseases caused by Gram-positive bacteria, especially Staphylococcus and Diphtheroids. To determine the resistance of Bacillus sp bacteria against mercury and erythromycin antibiotic. This study used a descriptive exploratory method with samples of bacteria and mercury are already available in the Laboratory of Pharmaceutical Microbiology. Based on the research that has been conducted, showed that the Bacillus sp bacteria is resistant to mercury and erythromycin.Keywords: bacteria, bacillus sp, resistant, mercury, erythromycinAbstrak: Merkuri merupakan logam berat bersifat toksik yang digunakan untuk penambalan gigi dalam bentuk amalgam. Untuk mengurangi efek toksik yang dihasilkan oleh merkuri, dapat digunakan bakteri resisten merkuri. Bakteri Bacillus sp merupakan bakteri gram positif yang resisten terhadap merkuri. Selain memiliki gen mer operon yang dapat mengubah Hg2+ menjadi Hg0 yang kurang toksik, bakteri Bacillus sp juga membentuk esterase yang menyebabkan terjadinya resisten bakteri ini terhadap antibiotik eritromisin. Eritromisin adalah antibiotik golongan makrolid yang digunakan untuk pengobatan penyakit akibat bakteri Gram positif khususnya Staphylococcus dan Diphtheroids. Untuk mengetahui resistensi bakteri Bacillus sp terhadap merkuri dan antibiotik eritromisin. Penelitian ini menggunakan metode deskriptif eksploratif dengan sampel bakteri dan merkuri yang sudah tersedia di Laboratorium Mikrobiologi Farmasi. Berdasarkan hasil penelitian yang telah dilakukan, diperoleh bahwa bakteri Bacillus sp resisten terhadap merkuri dan eritromisin.Kata Kunci: bakteri, bacillus sp, resisten, merkuri, eritromisin


1991 ◽  
Vol 46 (3) ◽  
pp. 336-342 ◽  
Author(s):  
Ratan Gachhui ◽  
Kalipada Pahan ◽  
Satyajit Ray ◽  
Jayasri Chaudhuri ◽  
Amalendu Mandal

Nature ◽  
1968 ◽  
Vol 217 (5129) ◽  
pp. 644-646 ◽  
Author(s):  
K. TONOMURA ◽  
K. MAEDA ◽  
F. FUTAI ◽  
T. NAKAGAMI ◽  
M. YAMADA

2019 ◽  
pp. 128-133
Author(s):  
Syed Zaghum Abbas ◽  
◽  
Choo Jing Yee ◽  
Kaizar Hossain ◽  
Akil Ahmad ◽  
...  

Sign in / Sign up

Export Citation Format

Share Document