Simple Chains
Mostrando 25-36 de 115 artigos, teses e dissertações.
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25. Endo-beta-N-acetylglucosaminidase H sensitivity of precursors to herpes simplex virus type 1 glycoproteins gB and gC.
The endoglycosidase endo-beta-N-acetylglucominidase H (endo H) was used to examine the nature of the oligosaccharides associated with the herpes simplex virus type 1 glycoproteins gA, gB, and gC. Immunoprecipitates from detergent extracts of infected cells, using monospecific antisera to gAB and gC, were treated with endo H. The low-molecular-weight precurso
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26. Immunoglobulin allotypes of rabbit kappa chains: polymorphism of a control mechanism regulating closely linked duplicated genes?
The amino acid sequence of the constant (CK) region from the kappa immunoglobulin chains of a b9 rabbit is compared with the CK sequences, taken from the literature, of a b4 rabbit. These CK regions differ by 33% of their amino acid sequences and by three sequence insertions or deletions (sequence gaps). These extensive differences together with other publis
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27. A double-headed Gly-Pro-Arg-Pro ligand mimics the functions of the E domain of fibrin for promoting the end-to-end crosslinking of γ chains by factor XIIIa
The E domain of fibrinogen represents the central region of the protein that, after the removal of fibrinopeptides from the N-termini of its α chains by thrombin, orders the noncovalent assembly of fibrin units into a half-staggered array. This structural organization is accomplished purely through noncovalent binding between the E domain of one molecule an
The National Academy of Sciences.
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28. RATES OF POLYPEPTIDE CHAIN ASSEMBLY IN LIVER IN VIVO: RELATION TO THE MECHANISM OF TEMPERATURE ACCLIMATION IN OPSANUS TAU*
A simple translational model, present herein, permits experimental determination of the rates of protein synthesis in vivo in terms of a time constant representing the average assembly time of the polypeptide chains. The model has been used to interpret incorporation of radioactive amino acids into toadfish liver fractions as a function of time after hepatic
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29. A test of lattice protein folding algorithms.
We report a blind test of lattice-model-based search strategies for finding global minima of model protein chains. One of us (E.I.S.) selected 10 compact conformations of 48-mer chains on the three-dimensional cubic lattice and used their inverse folding algorithm to design HP (H, hydrophobic; P, polar) sequences that should fold to those "target" structures
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30. Syringe method for stepwise chemical synthesis of oligonucleotides.
A simple procedure is described for synthesis of oligonucleotides by phosphate chemistry. Chains can be constructed rapidly with minimal equipment (a syringe and reagent bottles). The method is illustrated by synthesis of d-TGCAGGTT. Pertinent supporting data on the effect of variations in the detritylation, condensation, oxidation, capping and cleavage step
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31. The folded state of long duplex-DNA chain reflects its solution history.
The higher-order structure of compacted single giant DNA induced by complexation with polypeptide (poly-Arg) in NaCl solution was investigated using fluorescence microscopy. As the poly-Arg concentration increased, the mean size of extended DNA chains gradually decreased. In the presence of excess poly-Arg, individual DNA chains collapsed into compact globul
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32. Automatic classification of protein structure by using Gauss integrals
We introduce a method of looking at, analyzing, and comparing protein structures. The topology of a protein is captured by 30 numbers inspired by Vassiliev knot invariants. To illustrate the simplicity and power of this topological approach, we construct a measure (scaled Gauss metric, SGM) of similarity of protein shapes. Under this metric, protein chains n
The National Academy of Sciences.
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33. Detergent-phospholipid mixed micelles with a crystalline phospholipid core
An unusual micelle was discovered in mixtures of the nonionic detergent octaethyleneglycol-mono-n-dodecylether with disaturated phospholipids such as 1,2-dimyristoyl-sn-glycero-3-phosphocholine or 1,2-dipalmitoyl-sn-glycero-3-phosphocholine in water. These mixtures undergo a structural transition upon cooling through the chain-melting temperatures of the res
The National Academy of Sciences.
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34. Probing the Conformational Distributions of Subpersistence Length DNA
We have measured the bending elasticity of short double-stranded DNA (dsDNA) chains through small-angle x-ray scattering from solutions of dsDNA-linked dimers of gold nanoparticles. This method, which does not require exertion of external forces or binding to a substrate, reports on the equilibrium distribution of bending fluctuations, not just an average va
The Biophysical Society.
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35. Structure-function relations in phosphorylcholine-binding mouse myeloma proteins.
The binding site interactions between the phosphorylcholine (phosphocholine)-binding mouse myeloma proteins TEPC 15, W3207, McPC 603, MOPC 167, and MOPC 511 and the isotopically substituted hapten phosphoryl[methyl-13C]choline have been investigated using 13C and 31P nuclear magnetic resonance (NMR) spectroscopy. Each protein exhibits a unique NMR pattern, b
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36. RANDOM EVOLUTIONS, MARKOV CHAINS, AND SYSTEMS OF PARTIAL DIFFERENTIAL EQUATIONS
Several authors have considered Markov processes defined by the motion of a particle on a fixed line with a random velocity1, 6, 8, 10 or a random diffusivity.5, 12 A “random evolution” is a natural but apparently new generalization of this notion. In this note we hope to show that this concept leads to simple and powerful applications of probabilistic t