Serratia proteamaculans 568
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ABSTRACT:
PROVIDER: PRJNA17459 | ENA |
REPOSITORIES: ENA
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Project description:Genome sequence of Serratia proteamaculans 568 revealed the presence of three family 33 chitin binding proteins (CBPs). The three Sp CBPs (Sp CBP21, Sp CBP28 and Sp CBP50) were heterologously expressed and purified. Sp CBP21 and Sp CBP50 showed binding preference to β-chitin, while Sp CBP28 did not bind to chitin and cellulose substrates. Both Sp CBP21 and Sp CBP50 were synergistic with four chitinases from S. proteamaculans 568 (Sp ChiA, Sp ChiB, Sp ChiC and Sp ChiD) in degradation of α- and β-chitin, especially in the presence of external electron donor (reduced glutathione). Sp ChiD benefited most from Sp CBP21 or Sp CBP50 on α-chitin, while Sp ChiB and Sp ChiD had major advantage with these Sp CBPs on β-chitin. Dose responsive studies indicated that both the Sp CBPs exhibit synergism ≥ 0.2 µM. The addition of both Sp CBP21 and Sp CBP50 in different ratios to a synergistic mixture did not significantly increase the activity. Highly conserved polar residues, important in binding and activity of CBP21 from S. marcescens (Sm CBP21), were present in Sp CBP21 and Sp CBP50, while Sp CBP28 had only one such polar residue. The inability of Sp CBP28 to bind to the test substrates could be attributed to the absence of important polar residues.
| S-EPMC3348882 | biostudies-literature
Project description:We describe the heterologous expression and characterization of a 407-residue single-domain glycosyl hydrolase family 18 chitinase (SpChiD) from Gram-negative Serratia proteamaculans 568 that has unprecedented catalytic properties. SpChiD was optimally active at pH 6.0 and 40 °C, where it showed a K(m) of 83 mg ml(-1), a k(cat) of 3.9 × 10(2) h(-1), and a k(cat)/K(m) of 4.7 h mg(-1) ml(-1) on colloidal chitin. On chitobiose, the K(m), k(cat), and k(cat)/K(m) were 203 ?M, 1.3 × 10(2) h(-1), and 0.62 h(-1) ?M(-1), respectively. Hydrolytic activity on chitooligosaccharides (CHOS) and colloidal chitin indicated that SpChiD was an endo-acting processive enzyme, with the unique ability to convert released chitobiose to N-acetylglucosamine, the major end product. SpChiD showed hyper transglycosylation (TG) with trimer-hexamer CHOS substrates, generating considerable amounts of long-chain CHOS. The TG activity of SpChiD was dependent on both the length and concentration of the oligomeric substrate and also on the enzyme concentration. The length and amount of accumulated TG products increased with increases in the length of the substrate and its concentration and decreased with increases in the enzyme concentration. The SpChiD bound to insoluble and soluble chitin substrates despite the absence of accessory domains. Sequence alignments and structural modeling indicated that SpChiD would have a deep substrate-binding groove lined with aromatic residues, which is characteristic of processive enzymes. SpChiD shows a combination of properties that seems rare among family 18 chitinases and that may resemble the properties of human chitotriosidase.
| S-EPMC3416260 | biostudies-literature
Project description:In this study, we investigated the quorum sensing (QS) regulatory system of the psychrotrophic strain Serratia proteamaculans 94 isolated from spoiled refrigerated meat. The strain produced several N-acyl-L-homoserine-lactone (AHL) QS signal molecules, with N-(3-oxo-hexanoyl)-L-homoserine lactone and N-(3-hydroxy-hexanoyl)-L-homoserine lactone as two main types. The sprI and sprR genes encoding an AHL synthase and a receptor regulatory protein, respectively, were cloned and sequenced. Analysis of their nucleotide sequence showed that these genes were transcribed convergently and that their reading frames partly overlapped by 23 bp in the terminal regions. The genes were highly similar to the luxI/luxR-type QS genes of other Gram-negative bacteria. An spr-box (analog of the lux-box) was identified upstream of the sprR gene and found to be overlapped with the sequence of -10 sequence site in the promoter region of this gene. Inactivation of the sprI gene led to the absence of AHL synthesis, chitinolytic activity, and swimming motility; decrease of extracellular proteolytic activity; affected the cellular fatty acid composition; and reduced suppression of the fungal plant pathogen mycelium growth by volatile compounds emitted by strain S. proteamaculans 94. The data obtained demonstrated the important role of the QS system in the regulation of cellular processes in S. proteamaculans 94.
| S-EPMC6930789 | biostudies-literature
Project description:Whole genome sequencing of Serratia proteamaculans subsp. proteamaculans, an opportunistic pathogen
| PRJDB2859 | ENA
Project description:Serratia proteamaculans Genome sequencing
| PRJNA551516 | ENA
Project description:Cyanate hydratase (CynS) catalyzes the decomposition of cyanate and bicarbonate into ammonia and carbon dioxide. Here, the serendipitous crystallization of CynS from Serratia proteamaculans (SpCynS) is reported. SpCynS was crystallized as an impurity and its identity was determined using mass-spectrometric analysis. The crystals belonged to space group P1 and diffracted to 2.1?Å resolution. The overall structure of SpCynS is very similar to a previously determined structure of CynS from Escherichia coli. Density for a ligand bound to the SpCynS active site was observed, but could not be unambiguously identified. Additionally, glycerol molecules bound at the entry to the active site of the enzyme indicate conserved residues that might be important for the trafficking of substrates and products.
| S-EPMC4388186 | biostudies-literature
Project description:We describe the improvement of transglycosylation (TG) by chitinase D from Serratia proteamaculans (SpChiD). The SpChiD produced a smaller quantity of TG products for up to 90 min with 2 mm chitotetraose as the substrate and subsequently produced only hydrolytic products. Of the five residues targeted at the catalytic center, E159D resulted in substantial loss of both hydrolytic and TG activities. Y160A resulted in a product profile similar to SpChiD and a rapid turnover of substrate with slightly increased TG activity. The rest of the three mutants, M226A, Y228A, and R284A, displayed improved TG and decreased hydrolytic ability. Four of the five amino acid substitutions, F64W, F125A, G119S, and S116G, at the catalytic groove increased TG activity, whereas W120A completely lost the TG activity with a concomitant increase in hydrolysis. Mutation of Trp-247 at the solvent-accessible region significantly reduced the hydrolytic activity with increased TG activity. The mutants M226A, Y228A, F125A, S116G, F64W, G119S, R284A, and W247A accumulated approximately double the concentration of TG products like chitopentaose and chitohexaose, compared with SpChiD. The double mutant E159D/F64W regained the activity with accumulation of 6.0% chitopentaose at 6 h, similar to SpChiD at 30 min. Loss of chitobiase activity was unique to Y228A. Substitution of amino acids at the catalytic center and/or groove substantially improved the TG activity of SpChiD, both in terms of the quantity of TG products produced and the extended duration of TG activity.
| S-EPMC3531777 | biostudies-literature
Project description:Serratia proteamaculans 1C2F genome sequence
| PRJEB243 | ENA
Project description:Here the data on evolutionary relationships of persistent bacteria from water tanks and their close relatives are shown. Curated sequences of the hypervariable region of ribosomal ribonucleic acid (rRNA) obtained from a strain of Aeromonas hydrophila and two strains of Serratia proteamaculans after searches in the GenBank® database were analyzed. The analysis which included 104 other bacteria strains, was carried out using molecular evolutionary genetic analysis (MEGA 7.0) software.
| S-EPMC5684427 | biostudies-literature