ISDA

Entry Detail

PDB ID:

5BZ6

Keywords:

Title:

Crystal structure of the N-terminal domain single mutant (S92A) of the human mitochondrial calcium uniporter fused with T4 lysozyme

Biological Source:

Source Organism:

Enterobacteria phage T4, Homo sapiens

Host Organism:

Escherichia coli

PDB Version:

Deposition Date:

2015-06-11

Release Date:

2015-09-16

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.75 Å

R-Value Free:

0.23

R-Value Work:

0.16

R-Value Observed:

0.16

Space Group:

P 65

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Description:Lysozyme,Calcium uniporter protein, mitochondrial
Mutations:D20N, C54T, C97A, S1092A
Chain IDs:A
Chain Length:262
Number of Molecules:1
Biological Source:Enterobacteria phage T4, Homo sapiens

UniProt ID:D9IEF7 Pfam ID:PF00959 EC:3.2.1.17

Ligand Molecules

SO4

Primary Citation

Structure and function of the N-terminal domain of the human mitochondrial calcium uniporter.

Lee, Y, Min, C.K, Kim, T.G, Song, H.K, Lim, Y, Kim, D, Shin, K, Kang, M, Kang, J.Y, Youn, H.S, Lee, J.G, An, J.Y, Park, K.R, Lim, J.J, Kim, J.H, Kim, J.H, Park, Z.Y, Kim, Y.S, Wang, J, Kim, D.H, Eom, S.H.Show

Embo Rep. 16 1318 1333 (2015)

PMID: 26341627 DOI: 10.15252/embr.201540436

Abstact

The mitochondrial calcium uniporter (MCU) is responsible for mitochondrial calcium uptake and homeostasis. It is also a target for the regulation of cellular anti-/pro-apoptosis and necrosis by several oncogenes and tumour suppressors. Herein, we report the crystal structure of the MCU N-terminal domain (NTD) at a resolution of 1.50 Å in a novel fold and the S92A MCU mutant at 2.75 Å resolution; the residue S92 is a predicted CaMKII phosphorylation site. The assembly of the mitochondrial calcium uniporter complex (uniplex) and the interaction with the MCU regulators such as the mitochondrial calcium uptake-1 and mitochondrial calcium uptake-2 proteins (MICU1 and MICU2) are not affected by the deletion of MCU NTD. However, the expression of the S92A mutant or a NTD deletion mutant failed to restore mitochondrial Ca(2+) uptake in a stable MCU knockdown HeLa cell line and exerted dominant-negative effects in the wild-type MCU-expressing cell line. These results suggest that the NTD of MCU is essential for the modulation of MCU function, although it does not affect the uniplex formation.

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Primary Citation of related structures