Hsin-Yeh Hsieh

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Repressor of toxins (Rot) is known to be a global regulator of virulence gene expression in Staphylococcus aureus. The function of Rot, but not the transcription of rot, is regulated by the staphylococcal accessory gene regulator (Agr) quorum-sensing system. In addition, the alternative sigma factor (sigma(B)) has a repressive effect on rot expression(More)
There are many challenges in the accurate quantification of bacterial genes, such as the atrazine-degrading enzyme antA from Pseudomonas sp. strain ADP, from soil samples. We compared four quantitative methods for enumeration of atrazine-degrading bacteria in rhizosphere environments and utilized the optimal probe-based real-time polymerase chain reaction(More)
The outermost layer of the Bacillus anthracis spore consists of an exosporium comprised of two distinct layers, an outer hair-like nap layer and an internal basal layer. The hair-like nap is primarily comprised of the glycosylated collagen-like protein BclA. BclA is found in a trimeric form in close association with many other exosporium proteins in(More)
The Clostridium perfringens gene encoding the previously characterized alpha-N-acetylgalactosaminidase (alphaNAG) was identified by protein microsequencing and database searching. The alphaNAG protein, designated AagA, was found to be encoded by a hypothetical gene of unknown function in the recently completed genome sequence of C. perfringens strain 13.(More)
Clostridium perfringens alpha-N-acetylgalactosaminidase (alphaNAG) hydrolyzed the terminal N-acetyl-alpha-d-galactosamine from the blood type A(2) antigen producing H antigen, blood type O. Blood type O is universally compatible in the ABO system. Purification of the native enzyme is difficult with very low yields. To obtain the enzyme in satisfactory(More)
Enzymic modification of type A(2) erythrocyte membranes with Clostridium perfringens alpha-N-acetylgalactosaminidase was investigated. An ELISA demonstrated hydrolysis of type A(2) epitopes under conditions of red-blood-cell collection and storage. The enzyme hydrolysed the terminal N-acetyl-alpha-D-galactosamine from the blood type A(2) antigen, producing(More)
Coagulase-negative staphylococcal species are a common cause of subclinical bovine mastitis, with Staphylococcus chromogenes being one of the most frequently identified species in these cases. The draft genome sequence of an S. chromogenes isolate (MU 970) recovered from the milk of a cow with a chronic intramammary infection is reported here.
Coagulase-negative staphylococci are frequently isolated from cases of subclinical bovine mastitis. Reported here is a draft genome sequence of Staphylococcus simulans UMC-CNS-990, an isolate recovered from a chronic intramammary infection of a Holstein cow. Unexpectedly, a cluster of genes encoding gas vesicle proteins was found within the 2,755-kb genome.
Intramammary infections in dairy cattle are frequently caused by staphylococci, resulting in mastitis and associated economic losses. A draft genome sequence was determined for Staphylococcus equorum UMC-CNS-924, isolated from the milk of a Holstein cow, to better understand the genetic basis of its pathogenesis and adaptation to the bovine mammary gland.
Presented here is a draft genome sequence for Staphylococcus agnetis CBMRN 20813338, isolated from a lactating dairy cow with subclinical mastitis. The genome is approximately 2,416 kb and has 35.79% G+C content. Analysis of the deduced open reading frame (ORF) set identified candidate virulence attributes in addition to potential molecular targets for(More)