3DJZ

Crystal structure of transthyretin variant L55P at neutral pH

DOI: 10.2210/pdb3DJZ/pdb

Classification: TRANSPORT PROTEIN
Organism(s): Homo sapiens
Expression System: Escherichia coli
Mutation(s): Yes

Deposited: 2008-06-24 Released: 2009-07-14
Deposition Author(s): Cendron, L., Zanotti, G., Folli, C., Berni, R.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.82 Å
R-Value Free: 0.219
R-Value Work: 0.196
R-Value Observed: 0.197

wwPDB Validation 3D Report Full Report

This is version 1.2 of the entry. See complete history.

Literature

Amyloidogenic potential of transthyretin variants: insights from structural and computational analyses.

Cendron, L., Trovato, A., Seno, F., Folli, C., Alfieri, B., Zanotti, G., Berni, R.

(2009) J Biol Chem 284: 25832-25841

PubMed: 19602727 Search on PubMedSearch on PubMed Central
DOI: 10.1074/jbc.M109.017657
Primary Citation of Related Structures:
3DK2, 3DJR, 3DJS, 3DJT, 3DK0, 3DJZ

PubMed Abstract:

Human transthyretin (TTR) is an amyloidogenic protein whose mild amyloidogenicity is enhanced by many point mutations affecting considerably the amyloid disease phenotype. To ascertain whether the high amyloidogenic potential of TTR variants may be explained on the basis of the conformational change hypothesis, an aim of this work was to determine structural alterations for five amyloidogenic TTR variants crystallized under native and/or destabilizing (moderately acidic pH) conditions. While at acidic pH structural changes may be more significant because of a higher local protein flexibility, only limited alterations, possibly representing early events associated with protein destabilization, are generally induced by mutations. This study was also aimed at establishing to what extent wild-type TTR and its amyloidogenic variants are intrinsically prone to beta-aggregation. We report the results of a computational analysis predicting that wild-type TTR possesses a very high intrinsic beta-aggregation propensity which is on average not enhanced by amyloidogenic mutations. However, when located in beta-strands, most of these mutations are predicted to destabilize the native beta-structure. The analysis also shows that rat and murine TTR have a lower intrinsic beta-aggregation propensity and a similar native beta-structure stability compared with human TTR. This result is consistent with the lack of in vitro amyloidogenicity found for both murine and rat TTR. Collectively, the results of this study support the notion that the high amyloidogenic potential of human pathogenic TTR variants is determined by the destabilization of their native structures, rather than by a higher intrinsic beta-aggregation propensity.

Related Citations:

Acidic Ph-Induced Conformational Changes in Amyloidogenic Mutant Transthyretin.
Pasquato, N., Berni, R., Folli, C., Alfieri, B., Cendron, L., Zanotti, G.
(2007) J Mol Biol 366: 711

A Comparative Analysis of 23 Structures of the Amyloidogenic Protein Transthyretin.
Eneqvist, T., Olofsson, A., Lundgren, E., Sauer-Eriksson, A.E.
(2000) J Mol Biol 302: 649

Organizational Affiliation:

Department of Biological Chemistry, University of Padua, and Istituto di Chimica Biomolecolare, Section of Padua, Viale G. Colombo 3, 35121 Padua, Italy.

Macromolecules

Find similar proteins by:

(by identity cutoff) | Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Transthyretin	A, B	127	Homo sapiens	Mutation(s): 1 Gene Names: TTR, PALB
UniProt & NIH Common Fund Data Resources
Find proteins for P02766 (Homo sapiens) Explore P02766 Go to UniProtKB: P02766
PHAROS: P02766 GTEx: ENSG00000118271
Protein Feature View Expand
Reference Sequence