Aleksander Ratajczak

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Degradation of long-chain alkanes by Acinetobacter sp. strain ADP1 involves rubredoxin and rubredoxin reductase. We complemented a mutant deficient in alkane utilization and sequenced four open reading frames (ORFs) on the complementing DNA. Each of these ORFs was disrupted by insertional mutagenesis on the chromosome. As determined from sequence(More)
In Acinetobacter sp. strain ADP1, alkane degradation depends on at least five essential genes. rubAB and xcpR are constitutively transcribed. Here we describe inducible transcription of alkM, which strictly depends on the presence of the transcriptional activator AlkR. alkR itself is expressed at a low level, while a chromosomally located alkM::lacZ fusion(More)
Polyphosphate kinase (Ppk) catalyzes the formation of polyphosphate from ATP. We cloned the ppk gene (2,073 bp) from Acinetobacter sp. strain ADP1; this gene encodes a putative polypeptide of 78.6 kDa with extensive homology to polyphosphate kinase from Escherichia coli and other bacteria. Chromosomal disruption of ppk by inserting a transcriptionally fused(More)
Alkanes are oxidized in Acinetobacter sp. strain ADP1 by a three-component alkane monooxygenase, composed of alkane hydroxylase, rubredoxin, and rubredoxin reductase. rubA and rubB encode rubredoxin and a NAD(P)H-dependent rubredoxin reductase. We demonstrate here that single base pair substitutions in rubA or rubB lead to defects in alkane degradation,(More)
We determined 5.8 kilobases of nucleotide sequence upstream of the rubredoxin encoding rubA gene of Acinetobacter calcoaceticus (Ac) ADP1. Sequence analysis revealed four open reading frames named cysD', cobQ, sodA and lysS, coding for proteins with high similarity to known sulfate adenylate transferases (partial), cobyric acid synthases, superoxide(More)
A number of sweeteners contain a sulfonyl group. In our current search for new glucophores several new compounds containing such group were obtained. A series of novel 1-phenylsulfonylcyklohexanecarboxylic acids and 2-arylsulfonylalkanecarboxylic acids was obtained and evaluated for their sweet taste quality. It has been found that methyl substituents are(More)
wines the following rules have been found: the chemical shifts of the signals in the different wines are similar. The line widths of the two strong signals vary. The intensity ratios o f the two intensive signals differ strongly from wine to wine. The boron content varies substantially, in red wines it is generally higher than in white ones. Besides the(More)
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