Abstract:
:In continuation of our studies on the determination of the structural features of functionalized peptides in solution by combining time-resolved fluorescence data and molecular mechanics results, the conformational features of a series of linear, L-(alphaMe)Val-based peptides have been investigated in methanol. These foldamers have the general formula F[(alphaMe)Val](r)-T-[(alphaMe)Val](2)NHtBu, where (alphaMe)Val = C(alpha)-methylvaline and r = 0-3, while F [= fluoren-9-ylmethoxycarbonyl (Fmoc)] and T [= 2,2,6,6-tetramethylpiperidine-1-oxyl-4-amino-carboxylic (Toac)] are a fluorophoric N(alpha)-protecting group and a nitroxide-based alpha-amino acid quencher, respectively. According to ir and CD spectra, the longest term of the series (r = 3) attains a 3(10)-helical structure, while the other peptides populate an intramolecularly H-bonded, 3(10)-helix-like conformation affected by dynamic helical distortions, which are enhanced by the shortness of the backbone chain. Such distortions are reflected in both the energy of the stretching mode and the molar extinction coefficient of the H-bonded N-H groups, the former being higher and the latter smaller than those of a stable 3(10)-helix. Steady-state and time-resolved fluorescence measurements in methanol show a strong quenching of Fmoc by the Toac residue, located at different helix positions, depending on the r value. Comparison of quenching efficiencies and lifetime preexponents with those theoretically obtained from the deepest energy minimum conformers, assuming a Förster mechanism, is satisfactory. The computed structures exhibit a rather compact arrangement, which accounts for the few sterically favored conformations for each peptide, in full agreement with the time-resolved fluorescence data. Orientational effects between the probes must be taken into account for a correct interpretation of the fluorescence decay results, implying that interconversion among conformational substates involving the probes is slower than the energy transfer rate.
journal_name
Biopolymersjournal_title
Biopolymersauthors
Pispisa B,Mazzuca C,Palleschi A,Stella L,Venanzi M,Formaggio F,Polese A,Toniolo Cdoi
10.1002/1097-0282(2000)55:6<425::AID-BIP1018>3.0.Csubject
Has Abstractpub_date
2000-01-01 00:00:00pages
425-35issue
6eissn
0006-3525issn
1097-0282pii
10.1002/1097-0282(2000)55:6<425::AID-BIP1018>3.0.Cjournal_volume
55pub_type
杂志文章相关文献
BIOPOLYMERS文献大全abstract::The HPLC retention behavior of three complete single methionine and methionine sulfoxide replacement sets of two 18-mer model peptides and neuropeptide Y (NPY) were investigated. All peptides were prepared by multiple solid-phase peptide synthesis. Plotting the retention time differences between methionine and methion...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/(SICI)1097-0282(199608)39:2%3C207::AID-BIP
更新日期:1996-08-01 00:00:00
abstract::Recent advances in the application of solid state nmr spectroscopy to uniformly aligned biopolymers have opened a window through which to view the detailed structure of biological macromolecules that are unable to be seen with standard techniques for structure determination such as x-ray diffraction. Atomic resolution...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360330513
更新日期:1993-05-01 00:00:00
abstract::The DNA interaction of derivatives of ellipticine with heterocyclic ring systems with three, four, or five rings and a dimethylaminoethyl side chain was studied. Optical spectroscopy of drug complexes with calf thymus DNA, poly[(dA-dT).(dA-dT)], or poly[(dG-dC).(dG-dC)] showed a 10 nm bathochromic shift of the light a...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360340503
更新日期:1994-05-01 00:00:00
abstract::Xylanase XYNII from Trichoderma longibrachiatum is a small protein of the molecular weight 21 kDa, belonging to the family 11 of glycosyl hydrolases, which catalyses hydrolysis of xylan. This article reports thermal stability study of xylanase XYN II conformation in the temperature range 15-65 degrees C by the small a...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.20605
更新日期:2006-12-15 00:00:00
abstract::Peptide-conjugated polysaccharide matrices using bioactive laminin-derived peptides are useful biomaterials for tissue and cell engineering. Here, we demonstrate an easy handling preparation method for peptide-polysaccharide matrices using polyion complex with both alginate and chitosan. First, aldehyde-alginate was s...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.22983
更新日期:2017-01-01 00:00:00
abstract::Aqueous solutions of DNA fragments with a contour length (500 A) near the persistence length at DNA concentrations ranging from 10 to 290 mg/mL solvent and a constant supporting electrolyte concentration of 0.01 M (predominantly NaCl) were examined by 23Na-nmr spectroscopy at temperatures of 20, 40, and 60 degrees C. ...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360300715
更新日期:1990-01-01 00:00:00
abstract::The interhelical interfaces have been examined in seven high-resolution globin chains. The profiles of hydrophobic contact, as measured by the residue solvent-accessible area loss upon folding, have been calculated. The seven globins studied differ in their overall loss of solvent-accessible area upon packing of their...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360320504
更新日期:1992-05-01 00:00:00
abstract::Fourier transform IR (FTIR) spectroscopy has been successfully applied in recent years to examine the functional and structural properties of the membrane protein rhodopsin, a prototype G protein coupled receptor. Unlike UV-visible spectroscopy, FTIR spectroscopy is structurally sensitive. It may give us both global i...
journal_title:Biopolymers
pub_type: 杂志文章,评审
doi:10.1002/bip.10407
更新日期:2003-01-01 00:00:00
abstract::The pressure-induced structural changes of a de novo designed four-helix bundle protein, (alpha-l-alpha)(2), in aqueous solution have been investigated by FTIR spectroscopy. Changes in the amide I' band intensity show that pressure induces disruption of tertiary interactions and stabilizes the solvated alpha-helical f...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.20628
更新日期:2007-02-05 00:00:00
abstract::In the first two papers of this series, the tools necessary to evaluate substrate ring deformations were developed, and then the modeling of short amylose fragments (maltotriose and maltopentaose) inside the catalytic site of barley alpha-amylase was performed. In this third paper, this docking has been extended to th...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/(SICI)1097-0282(199912)50:7<751::AID-BIP8>
更新日期:1999-12-01 00:00:00
abstract::Designed ligands that inhibit protein-protein interactions involved in gene expression are valuable as reagents for genomics research and as leads for drug discovery efforts. Selective modulation of protein-protein interactions has proven to be a daunting task for synthetic ligands; however, the last decade has seen s...
journal_title:Biopolymers
pub_type: 杂志文章,评审
doi:10.1002/bip.21546
更新日期:2011-01-01 00:00:00
abstract::To optimize antigen-antibody reactions, we have synthesized chemically well-defined hydrophilic microspheres. Proteins or haptens were covalently linked to these carriers. When the microsphere conjugates were agglutinated by the corresponding antiserum, the size of the complex artificially increased during the immunol...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360320808
更新日期:1992-08-01 00:00:00
abstract::Circular dichroism using synchrotron radiation (SRCD) can extend the spectral range down to approximately 130 nm for dry proteins, potentially providing new structural information. Using a selection of dried model proteins, including alpha-helical, beta-sheet, and mixed-structure proteins, we observe a low-wavelength ...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.21011
更新日期:2008-09-01 00:00:00
abstract::The structures of the helices II-III region and the helix IV region of B. megaterium 5S rRNA have been examined by means of energy minimization and molecular dynamics calculations. Calculated distances between neighboring hydrogen-bonded imino protons in helices II, III, and IV were between 3.5 and 4.5 A. The overall ...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360320915
更新日期:1992-09-01 00:00:00
abstract::The conformation of basic fatty acid binding protein from chicken liver and the binding properties of the apo protein toward 11-dansylamino-undecanoic acid were investigated by CD and fluorescence spectroscopy. In one set of experiments the binding process was followed by the appearance of induced optical activity in ...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360340707
更新日期:1994-07-01 00:00:00
abstract::The chemical synthesis and x-ray crystal structure analysis of a model peptide incorporating a conformationally adaptable unsubstituted beta-Ala residue: Boc-beta-Ala-Acc6-OCH3 (C16H28N2O5, molecular weight = 328.41; 1) has been described. The peptide crystallized in the space group P2(1)2(1)2(1) a = 8.537 (3), b = 8....
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/(SICI)1097-0282(200005)53:6<447::AID-BIP1>
更新日期:2000-05-01 00:00:00
abstract::Three new polyoxaalkyl esters of lasalocid are synthesized. Their ability to form complexes with Li(+) and Na(+) cations is studied using multinuclear NMR methods, FTIR spectroscopy in the middle and far IR regions, and mass spectrometry. It is found that lasalocid esters form only 1:1 complexes with the metal cations...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.10194
更新日期:2002-10-15 00:00:00
abstract::The gel electrophoresis of spherical particles with a radius above 0.2 micron has not been reported yet. In the present study, video phase-contrast light microscopy is used to observe the motion of individual latex spheres, 0.52 micron in radius, during electrophoresis in 0.1% agarose gels. At 2 V/cm, the spheres init...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360291416
更新日期:1990-12-01 00:00:00
abstract::IR vibrational CD (VCD) has been observed for the cyclic pentapeptide cyclo-(-Gly-Pro-Gly-D-Ala-Pro-) in solution in CDBr3. The observed VCD spectra do not resemble the VCD features of any of the previously reported peptide secondary structures, such as alpha-helical, "random coil," or sheet structures, and might be d...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360320912
更新日期:1992-09-01 00:00:00
abstract::The conformation and intermolecular association of [D-Hyi2, L-Hyi4] meso-valinomycin [cyclo[-D-Val-D-Hyi-L-Val-L-Hyi-(D-Val-L-Hyi-L-Val-D-+ ++Hyi)2-], C60H102N6O18] in a crystal form obtained from ethanol solution has been determined by x-ray crystallography. Two depsipeptides and one ethanol molecule per asymmetric u...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/(SICI)1097-0282(199711)42:6<645::AID-BIP3>
更新日期:1997-11-01 00:00:00
abstract::We have found that tri-L-alanine (Ala3) can crystallize in a parallel-chain beta structure in addition to the previously known antiparallel-chain beta structure. Although the chain conformations in each structure are essentially similar, the ir and Raman spectra are distinctively different. We have calculated the norm...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360310208
更新日期:1991-02-05 00:00:00
abstract::Shorter analogues of a continuous epitope of hepatitis A virus, VP3(110-121) peptide, failed to react with convalescent sera, indicating the importance of the entire peptide in the epitope structure. To better understand the influence of the structural properties of this 12-mer peptide epitope on its biological activi...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/1097-0282(200012)54:7<477::AID-BIP10>3.0.C
更新日期:2000-12-01 00:00:00
abstract::The beta-subunit of the human chorionic gonadotropin (hCG) hormone, which is believed to be related to certain types of cancer, contains three hairpin-like fragments. To investigate the role of beta-hairpin formation in the early stages of the hCGbeta folding, a 28-residue peptide with the sequence RDVRFESIRLPGSPRGVNP...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/(SICI)1097-0282(19991005)50:4<413::AID-BIP
更新日期:1999-10-05 00:00:00
abstract::MUC1 mucin is a large transmembrane glycoprotein whose extracelluler domain is composed of repeating units of a 20 amino acid sequence. In the cancer associated state, this protein expression becomes upregulated and underglycosylated. Previous studies, which show an enhanced binding of a 5-repeat over a 1-repeat MUC1 ...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.20190
更新日期:2005-02-05 00:00:00
abstract::The visual pigment rhodopsin has been extensively studied for the kinetics of its photointermediates by various spectroscopic methods. Unlike such archaeal retinal proteins as bacteriorhodopsin, visual rhodopsin does not thermally recover its dark state after photoexcitation, which precludes repeated excitation of a s...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.20540
更新日期:2006-10-05 00:00:00
abstract::Experimental and computational methods of infrared microspectroscopy (IRI-MSP) and infrared spectral mapping (ISM) are presented. These methods are subsequently applied to the analysis of cirrhotic liver tissue. The sensitivity of infrared spectral mapping toward spectral changes caused by disease will be demonstrated...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/1097-0282(2000)57:5<282::AID-BIP50>3.0.CO;
更新日期:2000-01-01 00:00:00
abstract::Synthetic RNA poly[r(A-T)] has been synthesized and its CD spectral properties compared to those of poly[r(A-U)], poly[d(A-T)], and poly[d(A-U)] in various salt and ethanolic solutions. The CD spectra of poly[r(A-T)] in an aqueous buffer and of poly[d(A-T)] in 70.8% v/v ethanol are very similar, suggesting that they b...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.360290210
更新日期:1990-02-05 00:00:00
abstract::Small disulfide-rich peptides are translated as larger precursors typically containing an N-terminal prepro sequence. In this study, we investigated the role of a propeptide in the oxidative folding of an extremely hydrophobic delta-conotoxin, PVIA. delta-Conotoxin PVIA (delta-PVIA) is a 29-amino acid neurotoxin stabi...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.20211
更新日期:2005-01-01 00:00:00
abstract::Computer simulations can provide in principle quantitative correlation between the structures of DNA polymerases and the replication fidelity. This paper describes our progress in this direction. Using several theoretical approaches, including the free energy perturbation (FEP), linear response approximation (LRA), an...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.10244
更新日期:2003-03-01 00:00:00
abstract::New optical nanoresonance effects enabled us to study the effect of ions on nanometric carbohydrate thin layers on chips. Immobilization was done via spin coating of the derivatized carbohydrate polymer at a metallized chip surface forming ultrathin films (about 50-300 nm thick) followed by photochemical cross-linking...
journal_title:Biopolymers
pub_type: 杂志文章
doi:10.1002/bip.10371
更新日期:2003-07-01 00:00:00