8JOK

Crystal structure of V30L mutated human transthyretin

Summary for 8JOK

• Entry DOI: 10.2210/pdb8jok/pdb
• Descriptor: Transthyretin, MAGNESIUM ION (3 entities in total)
• Functional Keywords: thyroid hormone-binding protein, transport protein
• Biological source: Homo sapiens (human)
• Total number of polymer chains: 2
• Total formula weight: 29956.09

Authors

Mizuguchi, M.,Yamada, S.,Obita, T. (deposition date: 2023-06-07, release date: 2024-04-17, Last modification date: 2024-05-01)

Primary citation

Mizuguchi, M.,Obita, T.,Yamada, S.,Nabeshima, Y.
Trypsin-induced aggregation of transthyretin Valine 30 variants associated with hereditary amyloidosis.
Febs J., 291:1732-1743, 2024

PubMed Abstract: Amyloid fibrils of transthyretin (TTR) consist of full-length TTR and C-terminal fragments starting near residue 50. However, the molecular mechanism underlying the production of the C-terminal fragment remains unclear. Here, we investigated trypsin-induced aggregation and urea-induced unfolding of TTR variants associated with hereditary amyloidosis. Trypsin strongly induced aggregation of variants V30G and V30A, in each of which Val30 in the hydrophobic core of the monomer was mutated to less-bulky amino acids. Variants V30L and V30M, in each of which Val30 was mutated to bulky amino acids, also exhibited trypsin-induced aggregation. On the other hand, pathogenic variant I68L as well as the nonpathogenic V30I did not exhibit trypsin-induced aggregation. The V30G variant was extremely unstable compared with the other variants. The V30G mutation caused the formation of a cavity and the rearrangement of Leu55 in the hydrophobic core of the monomer. These results suggest that highly destabilized transthyretin variants are more susceptible to trypsin digestion.

PubMed: 38273457
DOI: 10.1111/febs.17070

Experimental method

X-RAY DIFFRACTION (1.64 Å)