ISDA

Deposition Date 2010-07-12

Release Date 2011-02-09

Last Version Date 2024-10-16

Entry Detail

PDB ID:

2XKU

Keywords:

IMMUNE SYSTEM

Title:

Prion-like conversion during amyloid formation at atomic resolution

Biological Source:

Source Organism:

HOMO SAPIENS (Taxon ID: 9606)

Host Organism:

ESCHERICHIA COLI

Method Details:

Experimental Method:

SOLUTION NMR

Conformers Calculated:

Conformers Submitted:

Selection Criteria:

LOWEST ENERGY

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:BETA-2-MICROGLOBULIN
Gene (Uniprot):B2M
Chain IDs:A
Chain Length:94
Number of Molecules:1
Biological Source:HOMO SAPIENS

UniProt ID:P61769 Pfam ID:PF07654

Ligand Molecules

Primary Citation

Conformational Conversion During Amyloid Formation at Atomic Resolution.

Eichner, T, Kalverda, A.P, Thompson, G.S, Homans, S.W, Radford, S.E, Eichner, T, Radford, S.E.Show

Mol.Cell 41 161 172 (2011)

PMID: 21255727 DOI: 10.1016/J.MOLCEL.2010.11.028

Abstact

Numerous studies of amyloid assembly have indicated that partially folded protein species are responsible for initiating aggregation. Despite their importance, the structural and dynamic features of amyloidogenic intermediates and the molecular details of how they cause aggregation remain elusive. Here, we use ΔN6, a truncation variant of the naturally amyloidogenic protein β(2)-microglobulin (β(2)m), to determine the solution structure of a nonnative amyloidogenic intermediate at high resolution. The structure of ΔN6 reveals a major repacking of the hydrophobic core to accommodate the nonnative peptidyl-prolyl trans-isomer at Pro32. These structural changes, together with a concomitant pH-dependent enhancement in backbone dynamics on a microsecond-millisecond timescale, give rise to a rare conformer with increased amyloidogenic potential. We further reveal that catalytic amounts of ΔN6 are competent to convert nonamyloidogenic human wild-type β(2)m (Hβ(2)m) into a rare amyloidogenic conformation and provide structural evidence for the mechanism by which this conformational conversion occurs.

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Primary Citation of related structures