Conformational preferences of synthetic peptides derived from the immunodominant site of the circumsporozoite protein of Plasmodium falciparum by sup 1 H NMR
- Research Institute of Scripps Clinic, La Jolla, CA (USA)
Proton nuclear magnetic resonance and ultraviolet circular dichroism spectroscopy have been used to probe the conformational ensemble of the tandemly repeated tetrapeptide unit of the circumsporozoite coat protein of the malaria parasite Plasmodium falciparum. Peptides based on the Asn-Ala-Asn-Pro and Asn-Pro-Asn-Ala cadences and composed of one to three tetrapeptide units were synthesized and examined using one- and two-dimensional NMR spectroscopy. The chemical shift of the amide protons, the temperature dependence of the amide proton chemical shift, and the patterns of NOE connectivities in the various peptides give evidence for the presence of a substantial population of folded conformers in several of the peptides in water solution at pH 5.0. Correlations between the behavior of the tandemly repeated units in different peptides have been used to infer the structure(s) of the folded conformers. The data are consistent with the presence of turnlike structures stabilized by hydrogen bonding of the backbone amid protons of the alanines and the asparagine residues preceding them. Specific differences in the strengths of NOEs between peptides of different lengths indicate that the folded structure is considerably stabilized by the presence of the asparagine residue following the alanine. Differences between peptides with different cadences of the tandemly repeating unit indicate that a repeating structural motif is formed by the Asn-Pro-Asn-Ala-(Asn) cadence.
- OSTI ID:
- 6101740
- Journal Information:
- Biochemistry; (USA), Vol. 29:34; ISSN 0006-2960
- Country of Publication:
- United States
- Language:
- English
Similar Records
Diverse Antibody Responses to Conserved Structural Motifs in Plasmodium falciparum Circumsporozoite Protein
Structural basis for antibody recognition of the NANP repeats in Plasmodium falciparum circumsporozoite protein
Related Subjects
POLYPEPTIDES
NUCLEAR MAGNETIC RESONANCE
ALANINES
ASPARAGINE
CHEMICAL SHIFT
MAGNETIC CIRCULAR DICHROISM
OVERHAUSER EFFECT
PLASMODIUM
PROTONS
AMIDES
AMINO ACIDS
ANIMALS
BARYONS
CARBOXYLIC ACIDS
DICHROISM
ELEMENTARY PARTICLES
FERMIONS
HADRONS
INVERTEBRATES
MAGNETIC RESONANCE
MICROORGANISMS
NUCLEONS
ORGANIC ACIDS
ORGANIC COMPOUNDS
ORGANIC NITROGEN COMPOUNDS
PARASITES
PEPTIDES
PROTEINS
PROTOZOA
RESONANCE
SPOROZOA
550601* - Medicine- Unsealed Radionuclides in Diagnostics