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  • 1.
    Angelin, Marcus
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Larsson, Rikard
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Vongvilai, Pornrapee
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Introducing Dynamic Combinatorial Chemistry: Probing the Substrate Selectivity of Acetylcholinesterase2010Ingår i: Journal of Chemical Education, ISSN 0021-9584, E-ISSN 1938-1328, Vol. 87, nr 11, s. 1248-1251Artikel i tidskrift (Refereegranskat)
  • 2.
    Angelin, Marcus
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Larsson, Rikard
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Vongvilai, Pornrapee
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Sakulsombat, Morakot
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Dynamic combinatorial resolution2009Ingår i: Dynamic Combinatorial Chemistry: In Drug Discovery, Bioorganic Chemistry, and Materials Science / [ed] Miller, B., John Wiley & Sons, 2009, s. 169-200Kapitel i bok, del av antologi (Refereegranskat)
  • 3.
    Larsson, Rikard
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Dynamic Systems for Screening, Control and Identification of Protein-Ligand Interactions2008Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Dynamic systems for screening, control and identification of different protein-ligand interactions are presented. Dynamic chemistry is used to produce new compounds/constituents in situ that can interact with a target molecule. Several entities can be introduced at the same time and interact with one another. These molecules make a dynamic combinatorial library (DCL) which is used in dynamic combinatorial chemistry (DCC). DCC is a recently introduced approach to generate dynamically interchanging libraries of compounds. These libraries are made of different building blocks that reversibly interact with one another and spontaneously assemble to encompass all possible combinations. If a target molecule, for instance a receptor is added to the system and one or more molecules show affinity to the target species, these compounds will, according to Le Châtelier´s principle, be amplified on the expense of the other non-bonding constituents. To further advance the technique, especially when biological systems are targeted, new reaction types and new screening methods are necessary. This thesis describes the development of different reversible reactions, thiol/disulfide interchange, transthiolesterification and the nitroaldol (Henry) reaction as means of generating reversible covalent bond reactions. Two different types of target proteins are used, enzymes belonging to the hydrolase family and the plant lectin Concanavalin A.

    Dynamic combinatorial resolution (DCR) is presented. This new concept relies on the consecutive kinetic resolution of dynamic combinatorial libraries, leading to complete amplification and control of dynamically interchangeable processes. By applying a kinetically controlled step to a thermodynamically controlled system, complete transformation and amplification can be obtained. The concept has been demonstrated by developing transthiolesterification and nitroaldol exchange reactions to generate diversity, forming libraries under thermodynamic control, and used in one-pot processes with kinetically controlled enzyme-mediated resolution. The results demonstrate that the reaction types are useful for the generation of dynamic libraries, and that the dynamic combinatorial resolution concept is highly valuable for efficient substrate identification, asymmetric synthesis, and library screening.

    The thesis also describes three other dynamic chemistry protocols. The first one describes dynamic kinetic resolution (DKR) of nitroaldol adducts by combined lipase catalysis. The second one describes finding lectin inhibitors from a glycodisulfide library and the third one describes finding an inhibitor of acetylcholinesterase using a tandem driven dynamic self-inhibition approach.

  • 4.
    Larsson, Rikard
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Reversible Sulfur Reactions in Pre-Equilibrated and Catalytic Self-Screening Dynamic Combinatorial Chemistry Protocols2006Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
    Abstract [en]

    Dynamic Combinatorial Chemistry (DCC) is a recently introduced supramolecular approach to generate dynamically interchanging libraries of compounds. These libraries are made of different building blocks that reversibly interact with one another and spontaneously assemble to encompass all possible combinations. If a target molecule, for instance a receptor is added to the system and one or more molecules show affinity to the target species, these compounds will, according to Le Châtelier´s principle, be amplified on the expense of the other non-bonding constituents. To date, only a handful of different systems and formats have been used. Hence, to further advance the technique, especially when biological systems are targeted, new reaction types and new screening methods are necessary. This thesis describes the development of reversible sulfur reactions, thiol/disulfide interchange and transthiolesterification (the latter being a new reaction type for DCC), as means of generating reversible covalent bond reactions. Two different types of target proteins are used, enzymes belonging to the hydrolase family and the plant lectin Concanavalin A. Furthermore, two new screening/analysis methods not previously used in DCC are also presented; the quartz crystal microbalance (QCM)-technique and catalytic self-screening.

  • 5.
    Larsson, Rikard
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Albers, Antonia
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Simons, Adrian
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Tandem Driven Dynamic Self-Inhibition of AcetylcholinesteraseManuskript (Övrigt vetenskapligt)
  • 6.
    Larsson, Rikard
    et al.
    KTH, Tidigare Institutioner, Kemi.
    Pei, Zhichao
    KTH, Tidigare Institutioner, Kemi.
    Ramström, Olof
    KTH, Tidigare Institutioner, Kemi.
    Catalytic Self-Screening of Cholinesterase Substrates from a Dynamic Combinatorial Thioester Library2004Ingår i: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 43, nr 28, s. 3716-3718Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Simply the best: Dynamic combinatorial chemistry coupled to enzyme catalysis was used to identify enzyme substrates in a library constructed from a series of thioesters and thiols by transesterification. The library was directly coupled to the catalytic action of acetylcholinesterase, which selectively hydrolyzed the best substrate candidates (see schematic representation). The process allowed rapid identification of discrete substrates.

  • 7.
    Larsson, Rikard
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Dynamic Combinatorial Thiolester Libraries for Efficient Catalytic Self-Screening of Hydrolase Substrates2006Ingår i: European Journal of Organic Chemistry, ISSN 1434-193X, E-ISSN 1099-0690, nr 1, s. 285-291Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Dynamic combinatorial thiolester libraries were efficiently generated from pools of thiols and acyl functionalities through reversible transthiolesterification in aqueous media at neutral pH. The dynamic features of the library generation were investigated, and the libraries were screened against acetylcholinesterase, clearly demonstrating the catalytic self-screening of its substrates from the constituents. Acetyl- and propionylthiocholine were easily identified as the best substrates for the enzyme, whereas other constituents showed lower efficiency or were inactive. A range of hydrolases was furthermore screened for rapid substrate identification, clearly demonstrating the differences in selectivity. The results show that transthiolesterification is a useful method to generate dynamic libraries, and that the catalytic self -screening concept is highly valuable for substrate identification.

  • 8.
    Larsson, Rikard
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Vongvilai, Pornrapee
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Angelin, Marcus
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Dynamic Combinatorial Resolution2007Ingår i: Materials, Membranes and Processes / [ed] G. Nechifor and M.Barboiu, Bucharest: Printech , 2007, s. 30-65Kapitel i bok, del av antologi (Övrigt vetenskapligt)
  • 9.
    Pei, Zhichao
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Larsson, Rikard
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Aastrup, Teodor
    Attana AB.
    Anderson, Henrik
    Uppsala University, Ångström Laboratory, Solid State Electronics.
    Lehn, Jean-Marie
    ISIS-Université Louis Pasteur.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Quartz crystal microbalance bioaffinity sensor for rapid identification of glycosyldisulfide lectin inhibitors from a dynamic combinatorial library2006Ingår i: Biosensors & bioelectronics, ISSN 0956-5663, E-ISSN 1873-4235, Vol. 22, nr 1, s. 42-48Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Carbohydrate-lectin,interactions were probed with dynamic combinatorial libraries, using the plant lectin Concanavalin A as target species. The dynamic combinatorial libraries were generated from a pool of thiol components through reversible thiol-disulfide interchange, and screened using a simple and efficient method based on a quartz crystal microbalance setup. It was found that dimers based on 1-thio- and 6-thin-mannose analogues were the most active inhibitors. Furthermore, the results clearly show that the 6-thio-mannose possess unique characteristics compared to its oxygen-containing counterpart.

  • 10.
    Vongvilai, Pornrapee
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Angelin, Marcus
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Larsson, Rikard
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Dynamic Combinatorial Resolution: Direct Asymmetric Lipase-Mediated Screening of a Dynamic Nitroaldol Library2007Ingår i: Angewandte Chemie International Edition, ISSN 1433-7851, E-ISSN 1521-3773, Vol. 46, nr 6, s. 948-950Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    (Chemical Equation Presented) A disturbance in the library: The nitroaldol (Henry) reaction was developed as an efficient C-C bond-forming route to dynamic combinatorial libraries (DCLs). These DCLs generated under thermodynamic control were coupled in a one-pot process with kinetically controlled lipase-mediated transesterification (see scheme). The asymmetric resolution of the DCLs by the enzyme led to enantiomerically pure β-nitroacetates in high yield.

  • 11.
    Vongvilai, Pornrapee
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Larsson, Rikard
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi.
    Direct Asymmetric Dynamic Kinetic Resolution by Combined Lipase Catalysis and Nitroaldol (Henry) Reaction2008Ingår i: Advanced Synthesis and Catalysis, ISSN 1615-4150, E-ISSN 1615-4169, Vol. 350, nr 3, s. 448-452Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    The asymmetric synthesis of β-nitroalkanol derivatives was simply achieved by a combined nitroaldol (Henry) reaction with lipase-catalyzed transesterification in high yield and enantiomeric purity (up to 92% and 99% ee) through a direct one-pot procedure.

  • 12.
    Zhang, Yan
    et al.
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Angelin, Marcus
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Larsson, Rikard
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Albers, Antonia
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Simons, Adrian
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Ramström, Olof
    KTH, Skolan för kemivetenskap (CHE), Kemi, Organisk kemi.
    Tandem driven dynamic self-inhibition of acetylcholinesterase2010Ingår i: Chemical Communications, ISSN 1359-7345, E-ISSN 1364-548X, Vol. 46, nr 44, s. 8457-8459Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A concept of tandem driven dynamic self-inhibition is demonstrated through dynamic inhibitors of acetylcholinesterase (AChE) using reversible transthiolesterification.

1 - 12 av 12
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