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National Repository of Grey Literature 2 records found  Search took 0.00 seconds. 
Functional study of the putative nucleotidase encoded by spr1057 gene in Streptococcus pneumoniae, a homologue of Escherichia coli protein YjjG
 Vacková, Zuzana ; Branny, Pavel (advisor) ; Lichá, Irena (referee)
ANGLICKÝ ABSTRAKT Functional study of the putative nucleotidase encoded by spr1057 gene in Streptococcus pneumoniae, a likely homolog of Escherichia coli protein YjjG. Bacterial cells are constantly exposed to innumerable toxic substances, either in their external environment or by by-products of their own metabolism. For these reasons, the bacterial cells evolved several mechanisms to cope with this challenge. These mechanisms are represented by: blocking the uptake, export by specific transporters as well as specific inactivation of these substance by enzymes. A particular group of these toxic substances are noncanonica nucleotides, which can directly inhibit bacterial cell DNA replication or can result in increased mutation rate. Enzymes recognizing these modified derivatives are known as "house-cleaning" nucleotide phsphateses, which can inactivate the potentially mutagenic nucleotides and prevent their incorporation into DNA and RNA. Some of the "house- cleaning" enzymes belong to a group of haloacid dehalogenase enzymes (haloacid dehalogenase-like hydrolase superfamily), which are found in many bacterial species. This thesis is focused on the function of hypothetical protein Spr1057 of Streptococcus pneumoniae with an unknown function. Sequence comparison revealed that Spr1057 has a significant...
Detailed record
Functional study of the putative nucleotidase encoded by spr1057 gene in Streptococcus pneumoniae, a homologue of Escherichia coli protein YjjG
 Vacková, Zuzana ; Lichá, Irena (referee) ; Branny, Pavel (advisor)
ANGLICKÝ ABSTRAKT Functional study of the putative nucleotidase encoded by spr1057 gene in Streptococcus pneumoniae, a likely homolog of Escherichia coli protein YjjG. Bacterial cells are constantly exposed to innumerable toxic substances, either in their external environment or by by-products of their own metabolism. For these reasons, the bacterial cells evolved several mechanisms to cope with this challenge. These mechanisms are represented by: blocking the uptake, export by specific transporters as well as specific inactivation of these substance by enzymes. A particular group of these toxic substances are noncanonica nucleotides, which can directly inhibit bacterial cell DNA replication or can result in increased mutation rate. Enzymes recognizing these modified derivatives are known as "house-cleaning" nucleotide phsphateses, which can inactivate the potentially mutagenic nucleotides and prevent their incorporation into DNA and RNA. Some of the "house- cleaning" enzymes belong to a group of haloacid dehalogenase enzymes (haloacid dehalogenase-like hydrolase superfamily), which are found in many bacterial species. This thesis is focused on the function of hypothetical protein Spr1057 of Streptococcus pneumoniae with an unknown function. Sequence comparison revealed that Spr1057 has a significant...
Detailed record

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