amyloidosis/prolīns

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Lappuse 1 no 332 rezultātiem

Prion Protein Prolines 102 and 105 and the Surrounding Lysine Cluster Impede Amyloid Formation.

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Human prion diseases can have acquired, sporadic, or genetic origins, each of which results in the conversion of prion protein (PrP) to transmissible, pathological forms. The genetic prion disease Gerstmann-Straussler-Scheinker syndrome can arise from point mutations of prolines 102 or 105. However,

Analysis of the secondary structure of beta-amyloid (Abeta42) fibrils by systematic proline replacement.

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Amyloid fibrils in Alzheimer's disease mainly consist of 40- and 42-mer beta-amyloid peptides (Abeta40 and Abeta42) that exhibit aggregative ability and neurotoxicity. Although the aggregates of Abeta peptides are rich in intermolecular beta-sheet, the precise secondary structure of Abeta in the

The nootropic and neuroprotective proline-containing dipeptide noopept restores spatial memory and increases immunoreactivity to amyloid in an Alzheimer's disease model.

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The effects of the novel proline-containing nootropic and neuroprotective dipeptide, noopept (GVS-111, N-phenylacetyl-L-prolylglycine ethyl ester) were investigated in NMRI mice following olfactory bulbectomy. We have shown previously that these animals developed Alzheimer's disease (AD)-like

Aggregation and neurotoxicity of mutant amyloid beta (A beta) peptides with proline replacement: importance of turn formation at positions 22 and 23.

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Aggregation of the amyloid beta peptides (A beta 1-42 and A beta 1-40) plays a pivotal role in pathogenesis of Alzheimer's disease. Although it is widely accepted that the aggregates of A betas mainly consist of beta-sheet structure, the precise aggregation mechanism remains unclear. To identify

Prolines Affect the Nucleation Phase of Amyloid Fibrillation Reaction; Mutational Analysis of Human Stefin B.

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Proline residues play a prominent role in protein folding and aggregation. We investigated the influence of single prolines and their combination on oligomerization and the amyloid fibrillation reaction of human stefin B (stB). The proline mutants influenced the distribution of oligomers between

Interaction of serum amyloid P component with hexanoyl bis(D-proline) (CPHPC).

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Under physiological conditions, the pentameric human plasma protein serum amyloid P component (SAP) binds hexanoyl bis(D-proline) (R-1-{6-[R-2-carboxy-pyrrolidin-1-yl]-6-oxo-hexanoyl}pyrrolidine-2-carboxylic acid; CPHPC) through its D-proline head groups in a calcium-dependent interaction.

Spermatogenic and steroidogenic impairment of the testicle characterizes the hereditary leucine-75-proline apolipoprotein a-I amyloidosis.

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BACKGROUND The leucine-75-proline variant of apolipoprotein A-I leads to a new hereditary systemic amyloidosis involving mostly the liver and kidney. OBJECTIVE The objective of the study was to examine the effects of this amyloidosis on testicular structure and function. METHODS This was an

The single proline-glutamine substitution at position 5 enhances the potency of amyloid fibril formation of murine apo A-II.

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The primary structure of murine apolipoprotein A-II (apo A-II) has been determined. Apo A-II consists of a single polypeptide chain of 78 amino acid residues, of which the amino-terminus is pyrrolidone carboxylic acid. Except for residues 5 and 38, the amino acid sequence is identical to that of

Novel proline endopeptidase inhibitors do not modify Abeta40/42 formation and degradation by human cells expressing wild-type and swedish mutated beta-amyloid precursor protein.

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Previous studies have suggested that proline endopeptidase (PE) could participate to the catabolism of the beta-amyloid peptide (Abeta) or to the physiopathological maturation of the beta-amyloid protein precursor (betaAPP). We have examined the putative ability of human purified PE to catabolize

Proline and lysine residues provide modulatory switches in amyloid formation: Insights from prion protein.

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Amyloidogenic proteins have an increased propensity to reorganize into the highly structured, β sheet rich structures that characterize amyloid. The probability of attaining these highly structured assemblies is influenced by multiple factors, including amino acid composition and environmental

The critical role of the central hydrophobic core (residues 71-77) of amyloid-forming αA66-80 peptide in α-crystallin aggregation: a systematic proline replacement study.

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Age-related cataract formation is marked by the progressive aggregation of lens proteins. The formation of protein aggregates in the aging lens has been shown to correlate with the progressive accumulation of a range of post-translational crystallin modifications, including oxidation, deamidation,

A generic mechanism of beta2-microglobulin amyloid assembly at neutral pH involving a specific proline switch.

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Although numerous measurements of amyloid assembly of different proteins under distinct conditions in vitro have been performed, the molecular mechanisms underlying the specific self-association of proteins into amyloid fibrils remain obscure. Elucidating the nature of the events that initiate

Proline Residues as Switches in Conformational Changes Leading to Amyloid Fibril Formation.

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Here we discuss studies of the structure, folding, oligomerization and amyloid fibril formation of several proline mutants of human stefin B, which is a protein inhibitor of lysosomal cysteine cathepsins and a member of the cystatin family. The structurally important prolines in stefin B are

Both the cis-trans equilibrium and isomerization dynamics of a single proline amide modulate β2-microglobulin amyloid assembly.

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The human protein β2-microglobulin (β2m) aggregates as amyloid fibrils in patients undergoing long-term hemodialysis. Isomerization of Pro32 from its native cis to a nonnative trans conformation is thought to trigger β2m misfolding and subsequent amyloid assembly. To examine this hypothesis, we

Substitution of isoleucine-31 by helical-breaking proline abolishes oxidative stress and neurotoxic properties of Alzheimer's amyloid beta-peptide.

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Alzheimer's disease (AD) brain is characterized by excess deposition of the 42-amino acid amyloid beta-peptide [A(beta)(1-42)]. AD brain is under intense oxidative stress, and we have previously suggested that A(beta)(1-42) was associated with this increased oxidative stress. In addition, we

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