Solubilization of isolated central-nervous-system myelin preparations by the amniotic detergent sodium dodecyl sulphate.
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ABSTRACT:
SUBMITTER: Crang AJ
PROVIDER: S-EPMC1185858 | biostudies-other | 1978 Sep
REPOSITORIES: biostudies-other
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Project description:The interaction of the myelin basic protein and two peptides derived from it with the anionic detergent SDS (sodium dodecyl sulphate) was studied. At molar ratios of detergent/protein of up to approx. 20:1 the transient increase in turbidity (as measured by increases in A230) is proportional to the ratio. Between ratios of 30:1 and 100:1 the effect of the detergent is constant and maximal. At molar ratios exceeding 100:1 the transient increase in turbidity decreases with increasing amounts of detergent. With increasing ionic strength the rapid development of turbidity is inhibited, whereas the slow decay of turbidity is not affected. Neither of the peptide fragments produced by cleavage of the myelin basic protein at the single tryptophan residue, nor both when mixed, produce measurable turbidity when mixed with SDS. Under similar conditions poly-L-lysine of similar molecular size to the basic protein shows the increase in turbidity but not the decay. The interaction between the protein and SDS is interpreted in molecular terms, which involve the initial ionic interaction of the detergent with protein resulting in aggregation and turbidity in the solution. Within the aggregated complexes molecules rearrange to maximize hydrophobic interactions.
| S-EPMC1184165 | biostudies-other
Project description:The intrinsic fluorescence characteristics of tyrosine and tryptophan residues in the proteins of isolated central-nervous-system myelin were investigated to gain information concerning the location of these residues within the intact membrane system. Tryptophan fluorescence from isolated myelin has an emission maximum at 325 nm that appears to arise from at least two different populations of tryptophan residues. Further evidence for heterogeneity of tryptophan location in the membrane is obtained from quenching studies with chloroform and acrylamide. It is speculated that one tryptophan population is hydrophobically situated and may be derived from the proteolipid protein of myelin, whereas the other tryptophan population is located at the membrane surface and may arise from the extrinsic basic protein. A significant tyrosine fluorescence is detected from isolated myelin, indicating that some of these residues are not quenched by structural interactions within the lipid--protein membrane system. Studies with freeze-dried resuspended myelin suggest that the structural arrangement of protein components in the dried rehydrated membrane system differs significantly from that of the freshly isolated myelin membrane.
| S-EPMC1186426 | biostudies-other
Project description:The aim of this study was to adapt a proprietary decellularisation process for human dermis for use with porcine skin. Porcine skin was subject to: sodium chloride (1?M) to detach the epidermis, trypsin paste to remove hair follicles, peracetic acid (0.1% v/v) disinfection, washed in hypotonic buffer and 0.1% (w/v) sodium dodecyl sulphate in the presence of proteinase inhibitors followed by nuclease treatment. Cellular porcine skin, decellularised porcine and human dermis were compared using histology, immunohistochemistry, GSL-1 lectin (alpha-gal epitope) staining, biochemical assays, uniaxial tensile and in vitro cytotoxicity tests. There was no microscopic evidence of cells in decellularised porcine dermis. DNA content was reduced by 98.2% compared to cellular porcine skin. There were no significant differences in the biomechanical parameters studied or evidence of cytotoxicity. The decellularised porcine dermis retained residual alpha-gal epitope. Basement membrane collagen IV immunostaining was lost following decellularisation; however, laminin staining was retained.
| S-EPMC5546651 | biostudies-literature
Project description:Rapid nerve conduction in the CNS is facilitated by the insulation of axons with myelin, a specialized oligodendroglial compartment distant from the cell body. Myelin is turned over and adapted throughout life; however, the molecular and cellular basis of myelin dynamics is not well understood. Hypothesizing that only a fraction of all myelin-related mRNAs has been identified so far, we subjected myelin biochemically purified from mouse brains at various ages to RNA sequencing. We find a surprisingly large pool of transcripts abundant and/or enriched in myelin. Furthermore, a comprehensive analysis showed that the myelin transcriptome is closely related to the myelin proteome but clearly distinct from the transcriptomes of oligodendrocytes and brain tissues, suggesting that the incorporation of mRNAs into the myelin compartment is highly selective. The mRNA-pool in myelin displays maturation-dependent dynamic changes of composition, abundance, and functional associations; however ageing-dependent changes after 6 months of age were minor. We suggest that this transcript pool provides a basis for the local modulation of myelin turnover and adaptation, i.e. in the individual internode. A light-weight membrane fraction enriched for myelin was purified from mouse brains as described previously (Jahn et al., Neuromethods, 2013). For RNA-Seq, RNA was isolated from myelin of mice from indicated ages.
2016-06-24 | E-GEOD-78151 | biostudies-arrayexpress
Project description:Sodium dodecyl sulfate (SDS) is one of the most commonly used detergent, which exhibits excellent biocidal activity against various bacteria and fungi. It is commonly employed in many detergent formulations and is employed for disinfection purposes. It is shown to be toxic to fishes, aquatic animals and is also inhibitory to microbes and cyanobacteria. We had isolated a strain belonging to Pseudomonas aeruginosa N1, from a detergent contaminated pond situated in Varanasi city India, which was able to degrade and metabolize SDS as a source of carbon. In the present investigation, we have studied chemotactic response of this strain towards SDS. The results clearly indicate that this strain showed chemotactic response towards SDS. The nature of chemotaxis was found to be metabolism dependent as glucose grown cells showed a delayed chemotactic response towards SDS. This is first study that reported chemotaxis response for P. aeruginosa towards anionic detergent SDS.
| S-EPMC4188490 | biostudies-literature
Project description:Reduced and unreduced lysozyme aggregates formed by formaldehyde cross-linking comprise a set of model compounds for studying the effects of protein conformation on the electrophoretic mobilities of sodium dodecyl sulphate-protein complexes. The reduced aggregates were indistinguisable from normal proteins, but the unreduced aggregates migrated anomalously fast by about 14%. Contrary to expectations, plots of logarithm Rf versus Kr (retardation coefficient) failed to reveal an unusual conformation for the unreduced aggregates. Thus the anomalous mobility caused by several intramolecular disulphide bonds escaped detection by the above two diagnostic plots. Also included in this paper is a discussion of the implications of these results with regard to current models for sodium dodecyl sulphate-protein complexes.
| S-EPMC1172562 | biostudies-other
Project description:Bacterial cytochrome P450s (CYPs) constitute an important family of monooxygenase enzymes that carry out essential roles in the metabolism of endogenous compounds and foreign chemicals. In the present work we report the characterization of CYP102A2 from B. subtilis with a focus on its substrate specificity. CYP102A2 is more active in oxidation of sodium dodecyl sulphate (SDS) than any other characterized CYP. The effect of SDS and NADPH concentration on reaction rate showed nonhyperbolic and hyperbolic dependence, respectively. The enzyme was found to exhibit a bell-shaped curve for plots of activity versus pH, over pH values 5.9-8.5. The rate of SDS oxidation reached the maximum value approximately at pH 7.2 and the pH transition observed controlled by two pK(a)s in the acidic (pK(a) = 6.7 ± 0.08) and basic (pK(a) = 7.3 ± 0.06) pH range. The results are discussed in relation to the future biotechnology applications of CYPs.
| S-EPMC2956967 | biostudies-literature
Project description:BackgroundSkin has a variety of functions that are incompletely understood at the molecular level. As the most accessible tissue in the body it often reveals the first signs of inflammation or infection and also represents a potentially valuable source of biomarkers for several diseases. In this study we surveyed the skin proteome qualitatively using gel electrophoresis, liquid chromatography tandem mass spectrometry (GeLC-MS/MS) and quantitatively using an isobaric tagging strategy (iTRAQ) to characterise the response of human skin following exposure to sodium dodecyl sulphate (SDS).ResultsA total of 653 skin proteins were assigned, 159 of which were identified using GeLC-MS/MS and 616 using iTRAQ, representing the most comprehensive proteomic study in human skin tissue. Statistical analysis of the available iTRAQ data did not reveal any significant differences in the measured skin proteome after 4 hours exposure to the model irritant SDS.ConclusionsThis study represents the first step in defining the critical response to an irritant at the level of the proteome and provides a valuable resource for further studies at the later stages of irritant exposure.
| S-EPMC4029809 | biostudies-literature
Project description:Rapid nerve conduction in the CNS is facilitated by the insulation of axons with myelin, a specialized oligodendroglial compartment distant from the cell body. Myelin is turned over and adapted throughout life; however, the molecular and cellular basis of myelin dynamics is not well understood. Hypothesizing that only a fraction of all myelin-related mRNAs has been identified so far, we subjected myelin biochemically purified from mouse brains at various ages to RNA sequencing. We find a surprisingly large pool of transcripts abundant and/or enriched in myelin. By bioinformatic comparison, the myelin transcriptome is closely related to the myelin proteome but clearly distinct from the transcriptomes of oligodendrocytes and brain tissues, suggesting that the incorporation of mRNAs into the myelin compartment is highly selective. The mRNA-pool in myelin displays maturation-dependent dynamic changes of composition, abundance, and functional associations; however ageing-dependent changes after 6 months of age were minor. We suggest that this transcript pool provides a basis for the local modulation of myelin turnover and adaptation, i.e. in the individual internode.
2016-12-31 | GSE76458 | GEO
Project description:Rapid nerve conduction in the CNS is facilitated by the insulation of axons with myelin, a specialized oligodendroglial compartment distant from the cell body. Myelin is turned over and adapted throughout life; however, the molecular and cellular basis of myelin dynamics is not well understood. Hypothesizing that only a fraction of all myelin-related mRNAs has been identified so far, we subjected myelin biochemically purified from mouse brains at various ages to RNA sequencing. We find a surprisingly large pool of transcripts abundant and/or enriched in myelin. Furthermore, a comprehensive analysis showed that the myelin transcriptome is closely related to the myelin proteome but clearly distinct from the transcriptomes of oligodendrocytes and brain tissues, suggesting that the incorporation of mRNAs into the myelin compartment is highly selective. The mRNA-pool in myelin displays maturation-dependent dynamic changes of composition, abundance, and functional associations; however ageing-dependent changes after 6 months of age were minor. We suggest that this transcript pool provides a basis for the local modulation of myelin turnover and adaptation, i.e. in the individual internode.
2016-06-24 | GSE78151 | GEO