PDBsum entry 4mrb

Transport protein

PDB id: 4mrb

Contents

Protein chains

115 a.a.

106 a.a.

Metals

_CA ×2

Waters ×82

PDB id:

4mrb

Name:

Transport protein

Title:

Wild type human transthyretin ph 7.5

Structure:

Transthyretin. Chain: a, b. Fragment: unp residues 21-147. Synonym: attr, prealbumin, tbpa

Source:

Homo sapiens. Human. Organism_taxid: 9606

Resolution:

1.27Å R-factor: 0.168 R-free: 0.209

Authors:

W.J.Chen,S.P.Wood

Key ref:

P.P.Mangione et al. (2014). Proteolytic cleavage of Ser52Pro variant transthyretin triggers its amyloid fibrillogenesis. Proc Natl Acad Sci U S A, 111, 1539-1544. PubMed id: 24474780 DOI: 10.1073/pnas.1317488111

Date:

17-Sep-13 Release date: 08-Jan-14

Protein chain

P02766  (TTHY_HUMAN) -  Transthyretin from Homo sapiens

Seq: 147 a.a.

Struc: 115 a.a.

Protein chain

P02766  (TTHY_HUMAN) -  Transthyretin from Homo sapiens

Seq: 147 a.a.

Struc: 106 a.a.

Enzyme reactions

• Enzyme class: Chains A, B: E.C.?

DOI no: 10.1073/pnas.1317488111

Proc Natl Acad Sci U S A 111:1539-1544 (2014)

PubMed id: 24474780

Proteolytic cleavage of Ser52Pro variant transthyretin triggers its amyloid fibrillogenesis.

P.P.Mangione, R.Porcari, J.D.Gillmore, P.Pucci, M.Monti, M.Porcari, S.Giorgetti, L.Marchese, S.Raimondi, L.C.Serpell, W.Chen, A.Relini, J.Marcoux, I.R.Clatworthy, G.W.Taylor, G.A.Tennent, C.V.Robinson, P.N.Hawkins, M.Stoppini, S.P.Wood, M.B.Pepys, V.Bellotti.

ABSTRACT

The Ser52Pro variant of transthyretin (TTR) produces aggressive, highly penetrant, autosomal-dominant systemic amyloidosis in persons heterozygous for the causative mutation. Together with a minor quantity of full-length wild-type and variant TTR, the main component of the ex vivo fibrils was the residue 49-127 fragment of the TTR variant, the portion of the TTR sequence that previously has been reported to be the principal constituent of type A, cardiac amyloid fibrils formed from wild-type TTR and other TTR variants [Bergstrom J, et al. (2005) J Pathol 206(2):224-232]. This specific truncation of Ser52Pro TTR was generated readily in vitro by limited proteolysis. In physiological conditions and under agitation the residue 49-127 proteolytic fragment rapidly and completely self-aggregates into typical amyloid fibrils. The remarkable susceptibility to such cleavage is likely caused by localized destabilization of the β-turn linking strands C and D caused by loss of the wild-type hydrogen-bonding network between the side chains of residues Ser52, Glu54, Ser50, and a water molecule, as revealed by the high-resolution crystallographic structure of Ser52Pro TTR. We thus provide a structural basis for the recently hypothesized, crucial pathogenic role of proteolytic cleavage in TTR amyloid fibrillogenesis. Binding of the natural ligands thyroxine or retinol-binding protein (RBP) by Ser52Pro variant TTR stabilizes the native tetrameric assembly, but neither protected the variant from proteolysis. However, binding of RBP, but not thyroxine, inhibited subsequent fibrillogenesis.