GLORIA

GEOMAR Library Ocean Research Information Access

Ihre E-Mail wurde erfolgreich gesendet. Bitte prüfen Sie Ihren Maileingang.

Leider ist ein Fehler beim E-Mail-Versand aufgetreten. Bitte versuchen Sie es erneut.

Vorgang fortführen?

Exportieren
  • 1
    Online-Ressource
    Online-Ressource
    Harborside Press, LLC ; 2020
    In:  Journal of the National Comprehensive Cancer Network Vol. 18, No. 3.5 ( 2020-03-20), p. BPI20-025-
    In: Journal of the National Comprehensive Cancer Network, Harborside Press, LLC, Vol. 18, No. 3.5 ( 2020-03-20), p. BPI20-025-
    Materialart: Online-Ressource
    ISSN: 1540-1405 , 1540-1413
    Sprache: Unbekannt
    Verlag: Harborside Press, LLC
    Publikationsdatum: 2020
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 2
    Online-Ressource
    Online-Ressource
    Cold Spring Harbor Laboratory ; 2004
    In:  RNA Vol. 10, No. 10 ( 2004-10), p. 1595-1608
    In: RNA, Cold Spring Harbor Laboratory, Vol. 10, No. 10 ( 2004-10), p. 1595-1608
    Kurzfassung: Ribonuclease P (RNase P) is a ribonucleoprotein complex that catalyzes the cleavage of the 5′ end of precursor tRNA. To characterize the interface between the Bacillus subtilis RNA (PRNA) and protein (P protein) components, the intraholoenzyme K D is determined as a function of ionic strength using a magnetocapture-based assay. Three distinct phases are evident. At low ionic strength, the affinity of PRNA for P protein is enhanced as the ionic strength increases mainly due to stabilization of the PRNA structure by cations. Lithium substitution in lieu of potassium enhances the affinity at low ionic strength, whereas the addition of ATP, known to stabilize the structure of P protein, does not affect the affinity. At high ionic strength, the observed affinity decreases as the ionic strength increases, consistent with disruption of ionic interactions. These data indicate that three to four ions are released on formation of holoenzyme, reflecting the number of ion pairs that occur between the P protein and PRNA. At moderate ionic strength, the two effects balance so that the apparent K D is not dependent on the ionic strength. The K D between the catalytic domain (C domain) and P protein has a similar triphasic dependence on ionic strength. Furthermore, the intraholoenzyme K D is identical to or tighter than that of full-length PRNA, demonstrating that the P protein binds solely to the C domain. Finally, pre-tRNA asp (but not tRNA asp ) stabilizes the PRNA•P protein complex, as predicted by the direct interaction between the P protein and pre-tRNA leader.
    Materialart: Online-Ressource
    ISSN: 1355-8382 , 1469-9001
    Sprache: Englisch
    Verlag: Cold Spring Harbor Laboratory
    Publikationsdatum: 2004
    ZDB Id: 1475737-0
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 3
    Online-Ressource
    Online-Ressource
    Ovid Technologies (Wolters Kluwer Health) ; 2021
    In:  Therapeutic Drug Monitoring Vol. 43, No. 1 ( 2021-02), p. 25-34
    In: Therapeutic Drug Monitoring, Ovid Technologies (Wolters Kluwer Health), Vol. 43, No. 1 ( 2021-02), p. 25-34
    Kurzfassung: The opioid crisis has had a substantial financial impact on the health care system in the United States. This study evaluates how health plans have been affected financially and shows how a laboratory benefit management (LBM) program can be used to address related drug testing in an outpatient setting. Methods: Monthly claims data from private health plans were collected from June 1, 2016 to February 29, 2020. The total number of claims (units) for definitive and presumptive drug testing were calculated and the number of paid claims recorded. Claims distribution by laboratory type and medical code billed, the paid rate and compound annual growth rate, and the test distribution and paid rate of rendering providers who had submitted a minimum of 1000 claims were determined. Results: In total, 2,004,230 drug testing claims were submitted. After the LBM program was implemented, the percentage of paid claims for definitive drug testing (Healthcare Common Procedure Coding System code G0483) decreased and the paid rate for the low-cost tests (HCPCS code G0480) in physician office and independent laboratory settings increased. The compound annual growth rate for G0483 claims submitted indicated a 70.5% and 31.9% decrease in payments to physician offices and independent laboratories, respectively, for the period ending February 2020. Conclusions: An LBM program can positively address policy enforcement while reducing unnecessarily complex tests and limiting potential fraud, waste, and abuse by directing testing toward laboratories amenable to cost-efficient contractual savings. Moreover, for definitive drug testing, the enforcement of the use of Healthcare Common Procedure Coding System codes and a move toward more cost-efficient tests (G0480), when clinically applicable, supported by clinical practice guidelines, or evidence-based medicine, is an approach to providing medical benefits while maintaining health costs.
    Materialart: Online-Ressource
    ISSN: 0163-4356
    Sprache: Englisch
    Verlag: Ovid Technologies (Wolters Kluwer Health)
    Publikationsdatum: 2021
    ZDB Id: 2048919-5
    SSG: 15,3
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 4
    In: RNA, Cold Spring Harbor Laboratory, Vol. 11, No. 6 ( 2005-06), p. 885-896
    Kurzfassung: RNase P is a ubiquitous endoribonuclease responsible for cleavage of the 5′ leader of precursor tRNAs (pre-tRNAs). Although the protein composition of RNase P holoenzymes varies significantly among Bacteria, Archaea, and Eukarya, the holoenzymes have essential RNA subunits with several sequences and structural features that are common to all three kingdoms of life. Additional structural elements of the RNA subunits have been found that are conserved in eukaryotes, but not in bacteria, and might have functions specifically required by the more complex eukaryotic holoenzymes. In this study, we have mutated four eukaryotic-specific conserved regions in Saccharomyces cerevisiae nuclear RNase P RNA and characterized the effects of the mutations on cell growth, enzyme function, and biogenesis of RNase P. RNase P with mutations in each of the four regions tested is sufficiently functional to support life although growth of the resulting yeast strains was compromised to varying extents. Further analysis revealed that mutations in three different regions cause differential defects in holoenzyme assembly, localization, and pre-tRNA processing in vivo and in vitro. These data suggest that most, but not all, eukaryotic-specific conserved regions of RNase P RNA are important for the maturation and function of the holoenzyme.
    Materialart: Online-Ressource
    ISSN: 1355-8382 , 1469-9001
    Sprache: Englisch
    Verlag: Cold Spring Harbor Laboratory
    Publikationsdatum: 2005
    ZDB Id: 1475737-0
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 5
    In: RNA, Cold Spring Harbor Laboratory, Vol. 13, No. 4 ( 2007-04), p. 521-535
    Kurzfassung: Bacterial ribonuclease P (RNase P) is a ribonucleoprotein complex composed of one catalytic RNA (PRNA) and one protein subunit (P protein) that together catalyze the 5′ maturation of precursor tRNA. High-resolution X-ray crystal structures of the individual P protein and PRNA components from several species have been determined, and structural models of the RNase P holoenzyme have been proposed. However, holoenzyme models have been limited by a lack of distance constraints between P protein and PRNA in the holoenzyme–substrate complex. Here, we report the results of extensive cross-linking and affinity cleavage experiments using single-cysteine P protein variants derivatized with either azidophenacyl bromide or 5-iodoacetamido-1,10- o -phenanthroline to determine distance constraints and to model the Bacillus subtilis holoenzyme–substrate complex. These data indicate that the evolutionarily conserved RNR motif of P protein is located near ( 〈 15 Å) the pre-tRNA cleavage site, the base of the pre-tRNA acceptor stem and helix P4 of PRNA, the putative active site of the enzyme. In addition, the metal binding loop and N-terminal region of the P protein are proximal to the P3 stem–loop of PRNA. Studies using heterologous holoenzymes composed of covalently modified B. subtilis P protein and Escherichia coli M1 RNA indicate that P protein binds similarly to both RNAs. Together, these data indicate that P protein is positioned close to the RNase P active site and may play a role in organizing the RNase P active site.
    Materialart: Online-Ressource
    ISSN: 1355-8382 , 1469-9001
    Sprache: Englisch
    Verlag: Cold Spring Harbor Laboratory
    Publikationsdatum: 2007
    ZDB Id: 1475737-0
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 6
    Online-Ressource
    Online-Ressource
    American Chemical Society (ACS) ; 2005
    In:  Biochemistry Vol. 44, No. 49 ( 2005-12-01), p. 16130-16139
    In: Biochemistry, American Chemical Society (ACS), Vol. 44, No. 49 ( 2005-12-01), p. 16130-16139
    Materialart: Online-Ressource
    ISSN: 0006-2960 , 1520-4995
    RVK:
    Sprache: Englisch
    Verlag: American Chemical Society (ACS)
    Publikationsdatum: 2005
    ZDB Id: 1472258-6
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
  • 7
    Online-Ressource
    Online-Ressource
    Cold Spring Harbor Laboratory ; 2011
    In:  RNA Vol. 17, No. 7 ( 2011-07), p. 1225-1235
    In: RNA, Cold Spring Harbor Laboratory, Vol. 17, No. 7 ( 2011-07), p. 1225-1235
    Kurzfassung: Ribonuclease P (RNase P) catalyzes the metal-dependent 5′ end maturation of precursor tRNAs (pre-tRNAs). In Bacteria, RNase P is composed of a catalytic RNA (PRNA) and a protein subunit (P protein) necessary for function in vivo. The P protein enhances pre-tRNA affinity, selectivity, and cleavage efficiency, as well as modulates the cation requirement for RNase P function. Bacterial P proteins share little sequence conservation although the protein structures are homologous. Here we combine site-directed mutagenesis, affinity measurements, and single turnover kinetics to demonstrate that two residues (R60 and R62) in the most highly conserved region of the P protein, the RNR motif (R60–R68 in Bacillus subtilis ), stabilize PRNA complexes with both P protein (PRNA•P protein) and pre-tRNA (PRNA•P protein•pre-tRNA). Additionally, these data indicate that the RNR motif enhances a metal-stabilized conformational change in RNase P that accompanies substrate binding and is essential for efficient catalysis. Stabilization of this conformational change contributes to both the decreased metal requirement and the enhanced substrate recognition of the RNase P holoenzyme, illuminating the role of the most highly conserved region of P protein in the RNase P reaction pathway.
    Materialart: Online-Ressource
    ISSN: 1355-8382 , 1469-9001
    Sprache: Englisch
    Verlag: Cold Spring Harbor Laboratory
    Publikationsdatum: 2011
    ZDB Id: 1475737-0
    SSG: 12
    Standort Signatur Einschränkungen Verfügbarkeit
    BibTip Andere fanden auch interessant ...
Schließen ⊗
Diese Webseite nutzt Cookies und das Analyse-Tool Matomo. Weitere Informationen finden Sie hier...