A BamHI-EcoRV DNA fragment, containing tandemly arranged genes for the Bacillus cereus VKM-B164 phosphatidylcholine-specific phospholipase C and sphingomyelinase, has been cloned and sequenced in pUC19 plasmid (EMBL accession No X64141). The obtained gene sequences have been compared with those the B. cereus strains SE-1, IAM-1208 and GP-4 reported previously. Both phospholipase C and sphingomyelinase gene sequences of the VKM-B164 strain were found to be identical to those of the strain SE-1 and to differ from the sequences of GP-4 and IAM-1208 strains, containing another version of the gene sequences.
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J Lipid Res
December 2024
Université Paris-Saclay, INRAE, AgroParisTech, Micalis Institute, Jouy en Josas, France. Electronic address:
Phages are ubiquitous in bacteria, including clinical Staphylococcus aureus, where Sfi 21/Sa3 phages often integrate into the hlb gene, which encodes Hlb sphingomyelinase. This integration acts as a rapid regulatory switch for Hlb production. Our findings suggest that Sfi 21/Sa3 prophages and Hlb activity influence S.
View Article and Find Full Text PDFCan J Vet Res
October 2024
College of Medical Technology, Chongqing Medical and Pharmaceutical College, 82 Daxuecheng Road, Chongqing 401331, PR China (Chongli Xu, She, Fu, Peng); School of Biology and Agriculture, Shaoguan University, Shaoguan 512005, PR China (Chongbo Xu).
Int J Biol Macromol
November 2024
Department of Cell Biology, Federal University of Paraná (UFPR), Curitiba 81530-900, PR, Brazil. Electronic address:
Spiders of Loxosceles genus, or Brown spiders produce a potent venom with minimal volume and protein content. Among its toxins, phospholipases D (PLDs) are notable for causing primary local and systemic manifestations observed following envenomation. They degrade cellular phospholipids, mainly sphingomyelin and lysophosphatidylcholine.
View Article and Find Full Text PDFActa Trop
October 2024
Department of Cell Biology, Federal University of Paraná (UFPR), Curitiba, 81530-900, PR, Brazil. Electronic address:
Loxoscelism is the pathological condition triggered by a brown spider bite. The venom of these spiders is rich in phospholipases D (PLDs), which can induce virtually all local and systemic manifestations. Recombinant mutated PLDs from clinically relevant Loxosceles species in South America have been investigated as potential antigens to develop novel therapeutic strategies for loxoscelism.
View Article and Find Full Text PDFBiochimie
December 2024
Molecular Toxinology Lab, Research and Development Department, Ezequiel Dias Foundation - Funed, Belo Horizonte, MG, Brazil. Electronic address:
The Loxosceles genus represents one of the main arachnid genera of medical importance in Brazil. Despite the gravity of Loxosceles-related accidents, just a handful of species are deemed medically important and only a few have undergone comprehensive venom characterization. Loxosceles amazonica is a notable example of a potentially dangerous yet understudied Loxosceles species.
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