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Sökning: WFRF:(Tong Ling)

  • Resultat 1-10 av 17
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  • Sodergren, Erica, et al. (författare)
  • The genome of the sea urchin Strongylocentrotus purpuratus.
  • 2006
  • Ingår i: Science. - : American Association for the Advancement of Science (AAAS). - 1095-9203 .- 0036-8075. ; 314:5801, s. 941-52
  • Tidskriftsartikel (refereegranskat)abstract
    • We report the sequence and analysis of the 814-megabase genome of the sea urchin Strongylocentrotus purpuratus, a model for developmental and systems biology. The sequencing strategy combined whole-genome shotgun and bacterial artificial chromosome (BAC) sequences. This use of BAC clones, aided by a pooling strategy, overcame difficulties associated with high heterozygosity of the genome. The genome encodes about 23,300 genes, including many previously thought to be vertebrate innovations or known only outside the deuterostomes. This echinoderm genome provides an evolutionary outgroup for the chordates and yields insights into the evolution of deuterostomes.
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  • 2021
  • swepub:Mat__t
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  • 2019
  • Tidskriftsartikel (refereegranskat)
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  • Bjelic, Sinisa, et al. (författare)
  • Exploration of Alternate Catalytic Mechanisms and Optimization Strategies for Retroaldolase Design
  • 2014
  • Ingår i: Journal of Molecular Biology. - : Elsevier BV. - 0022-2836 .- 1089-8638. ; 426:1, s. 256-271
  • Tidskriftsartikel (refereegranskat)abstract
    • Designed retroaldolases have utilized a nucleophilic lysine to promote carbon-carbon bond cleavage of β-hydroxy-ketones via a covalent Schiff base intermediate. Previous computational designs have incorporated a water molecule to facilitate formation and breakdown of the carbinolamine intermediate to give the Schiff base and to function as a general acid/base. Here we investigate an alternative active-site design in which the catalytic water molecule was replaced by the side chain of a glutamic acid. Five out of seven designs expressed solubly and exhibited catalytic efficiencies similar to previously designed retroaldolases for the conversion of 4-hydroxy-4-(6-methoxy-2-naphthyl)-2-butanone to 6-methoxy-2-naphthaldehyde and acetone. After one round of site-directed saturation mutagenesis, improved variants of the two best designs, RA114 and RA117, exhibited among the highest kcat (>10(-3)s(-1)) and kcat/KM (11-25M(-1)s(-1)) values observed for retroaldolase designs prior to comprehensive directed evolution. In both cases, the >10(5)-fold rate accelerations that were achieved are within 1-3 orders of magnitude of the rate enhancements reported for the best catalysts for related reactions, including catalytic antibodies (kcat/kuncat=10(6) to 10(8)) and an extensively evolved computational design (kcat/kuncat>10(7)). The catalytic sites, revealed by X-ray structures of optimized versions of the two active designs, are in close agreement with the design models except for the catalytic lysine in RA114. We further improved the variants by computational remodeling of the loops and yeast display selection for reactivity of the catalytic lysine with a diketone probe, obtaining an additional order of magnitude enhancement in activity with both approaches.
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  • Chan, WT, et al. (författare)
  • Realist evaluation of a transdisciplinary mealtime management service for autistic children
  • 2023
  • Ingår i: Autism : the international journal of research and practice. - : SAGE Publications. - 1461-7005. ; 27:6, s. 1547-1559
  • Tidskriftsartikel (refereegranskat)abstract
    • Autistic children commonly experience mealtime difficulties; however, it is unknown what makes an effective transdisciplinary mealtime service for autistic children. This study used a realist evaluation framework to explore caregivers’ and therapists’ perceptions of the contexts, mechanisms and associated outcomes of a transdisciplinary mealtime management service for autistic children. Semi-structured interviews were conducted with six caregivers of autistic children engaged in a transdisciplinary mealtime service and 10 therapists providing the service, with interview data analysed using a realist evaluation approach. Four-context (child factors, family factors, therapist factors and institutional parameters), three-mechanism (transdisciplinary collaboration, child-centred approach and managing caregiver expectations) and two-outcome (impact on the child and impact on the caregiver) themes were identified. Findings highlighted that transdisciplinary collaboration, a child- and family-centred approach and managing caregiver expectations are key mechanisms providing a foundation for the development of evidence-based mealtime services for autistic children. Mealtimes and eating can be difficult for autistic children. A service where different professions work together is required to address the varied and complex mealtime difficulties of autistic children. Little is known about what is needed for such services to be effective. We interviewed six caregivers of autistic children who were engaged in a mealtime service and 10 therapists who are involved in delivering the service to understand their perspectives on the factors that were driving the effectiveness of the mealtime service. We found that different health professionals from different disciplines working together, focusing on adapting intervention to the child and family and managing expectations of the caregiver were important in contributing to outcomes of the mealtime service. The findings of this study can be used to inform the development of more effective interventions and services to support the well-being and development of autistic children.
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