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Tagged coils

Fig. 20 Structural representation of the hybrid hydrogel of poly(HMPA-co-DAMA) connected to a His-tagged coiled coil via a Np complex. Reprinted with permission from [88]. Copyright 1999 Nature Publishing group... Fig. 20 Structural representation of the hybrid hydrogel of poly(HMPA-co-DAMA) connected to a His-tagged coiled coil via a Np complex. Reprinted with permission from [88]. Copyright 1999 Nature Publishing group...
Due to the sensitivity of electronic excitation transport to the separation and orientation of chromophores, techniques which monitor the rate of excitation transport among chromophores on polymer chains are direct probes of the ensemble average conformation (S). It is straightforward to understand qualitatively the relationship between excitation transport dynamics and the size of an isolated polymer coil which is randomly tagged in low concentration with chromophores. An ensemble of tagged coils in a polymer blend will have some ensemble averaged root-mean-squared radius of gyration,... [Pg.324]

For polystyrene fractions in diethyl phthalate solution (30000average value of 1.6 x 10 18 ( 50%). In dilute solution e/36M is 1.27 x 10 18 for polystyrene (21). No systematic variations with concentration, molecular weight or temperature were apparent, the scatter of the data being mainly attributable to the experimental difficulties of the diffusion measurements. The value of Drj/cRT for an undiluted tagged fraction of polyfn-butyl acrylate) m pure polymer was found to be 2.8 x 10 18. The value of dilute solution data for other acrylate polymers (34). Thus, transport behavior, like the scattering experiments, supports random coil configuration in concentrated systems, with perhaps some small expansion beyond 6-dimensions. [Pg.11]

A major advancement derived from research into homo- versus heterodimerization specificity includes the use of de novo designed coiled coils for applications that require selective heterodimerization, such as was described by Tripet et al., 67 who developed a unique affinity matrix protein tag system as a rapid and sensitive method to detect, purify, and characterize newly expressed recombinant peptides and proteins from cell extracts. In... [Pg.73]

The absolute control over the genes that encode for the proteins readily allows the introduction of different functionalities that can be attached to synthetic polymers. Kopecek et al. [88,89] used this methodology to produce coiled-coil peptide sequences, e.g. (VSSLESK)n containing a histidine tag on the end. The hydrophobic interaction between the side groups of the valines and leucines in the sequence causes the protein to as-siune a helical or coil type structure. These hydrophobic interactions then cause several coils to further aggregate to form so called coiled coils. This coiled coil aggregation can be disrupted by temperature, pH and solvent. A copolymer of poly[N-(2-hydroxy-propyl) methacrylamide- co-(N, N"-dicarboxymethylaminopropyl)methacrylamide], (p[HPMA-co-DAMA]) with... [Pg.43]

A method for calculating observables resulting from incoherent excitation transport among chromophores randomly tagged in low concentration on isolated, flexible polymer chains is described. The theory relates the ensemble average root-mean-square radius of gyration ) of a polymer coil to the rate... [Pg.323]


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