Tuesday, June 06, 2006

Novel Antimicrobials Protect Against Mastitis-Causing Bacteria

An Agricultural Research Service (ARS)-led team has combined specific DNA segments from two different sources to produce a novel antimicrobial protein. The resulting "fusion" antimicrobial protein degrades the cell walls of several bacterial pathogens in a solution of whey extracted from cow's milk.

Agriculturally, the technology provides a key step to developing dairy cows that have a natural, built-in defense against mastitis--a disease that costs U.S. dairy producers up to $2 billion annually.In the realm of infectious disease, one way to reduce microbial resistance that results from widespread antibiotic use is to come up with new ways to fight pathogens.

The findings from this experimental study were published in the April 2006 issue of Applied Environmental Microbiology.David M. Donovan, a molecular biologist at the ARS Biotechnology and Germplasm Laboratory at Beltsville, Md., presented the study's results today at the American Society for Microbiology's 2006 annual meeting, in Orlando, Fla. ARS is the U.S. Department of Agriculture's chief scientific research agency.

Donovan is the named inventor on a USDA/ARS-filed patent application that describes the technology behind fusing the protein-coding DNA sequences that produce the novel fusion antimicrobial. He and colleagues from Birmingham, Ala., and Quebec, Canada, hope to use the technology to produce fusion proteins as alternatives to the use of broad-range antibiotics both in clinics and on farms.

While all milk contains several naturally occurring antimicrobial proteins, such as lysozyme and lactoferrin, the sale of milk containing the fusion protein would first require rigorous food safety testing and federal regulatory approval.Bacteria have layers of macromolecules that provide strength and shape to their cell walls.

The fusion antimicrobial protein, as a cell-wall-degrading enzyme, kills pathogens by decomposing this structural layer and causing the cell to break down.The B30-lysostaphin fusion protein developed by Donovan\'s team is active against both Staphylococcus aureus and three streptococcal mastitis pathogens that together are responsible for up to 50 percent of the dairy cattle mastitis that occurs in the United States.


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AGRI-INFO/JUNE 6, 2006


TITLE: NOVEL ANTIMICROBIALS PROTECT AGAINST MASTITIS-CAUSING BACTERIA


ALAM BA NINYO NA NAGAWANG PAGSANIBIN NG MGA SIYENTISTA ANG MGA DNA SEGMENT MULA SA DALAWANG SOURCES PARA MAGKAROON NG ANTIMICROBIAL PROTEIN?

ANG ANTI-MICROBIAL PROTEIN NA ITO AY SIYANG NAKITANG PANTAPAT SA BAKTERYANG NAGDUDULOT NG SAKI NA MASTITIS.

MAAARING GAWING ANG TEKNOLOHIYANG ITO PARA MATIYAK ANG MALINIS AT WALANG SAKIT NA GATAS MULA SA GATASANG BAKA.

ISINASA-ALANG-ALANG NG MGA EKSPERTO ANG PANGANIB NA MAIDULOT NG SOBRANG PAGGAMIT NG ANTIBIOTIC NA SA HALIP NA MAKATULONG AY SIYA PANG DAHILAN KUNG BAKIT LALU PANG LUMALAKAS ANG MICROBIAL RESISTANCE.

ANG BAGONG TEKNOLOHIYA AY IPINAKILALA MISMO NI MOLECULAR BIOLOGIST DAVID DONOVAN KUNG SAAN NAILATAG ITO SA AMERICAN SOCIETY FOR MICROBIOLOGY 2006 ANNUAL MEETING SA ORLANDO FLORIDA.

SI DONOVAN ANG PINANGALANANG INVENTOR NG NATURANG TEKNOLOHIYA SA TINATAWAG NA NOVEL FUSION ANTIMICROBIAL.

ITO UMANO ANG MAGSISILBING ALTERNATIBO SA PAGGAMIT NG BROAD-RAGNE ANTIBIOTICS SA KLINIKA AT SA SAKAHAN.

BAGAMAN ANG LAHAT NG GATAS AY MERONG IBAT-IBANG NATURAL ANTIMICROBIAL PROTEINS TULAD NG LYSOZYME AT LACTOFERRIN, ANG PAGBEBENTA NG GATAS NA MERONG FUSION PROTEIN AY KAILANGANG SUMAILALIM SA FOOD SAFETY TESTING AT APPROVAL NG FEDERAL REGULATORY.

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