ABCB7 p.Glu208Asp
| Predicted by SNAP2: | A: D (80%), C: D (75%), D: D (71%), F: D (91%), G: D (85%), H: D (80%), I: D (85%), K: D (91%), L: D (85%), M: D (85%), N: D (71%), P: D (91%), Q: D (75%), R: D (91%), S: D (75%), T: D (80%), V: D (85%), W: D (91%), Y: D (91%), |
| Predicted by PROVEAN: | A: D, C: D, D: D, F: D, G: D, H: D, I: D, K: D, L: D, M: D, N: D, P: D, Q: D, R: D, S: D, T: D, V: D, W: D, Y: D, |
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[hide] Crystal structures of nucleotide-free and glutathi... Science. 2014 Mar 7;343(6175):1137-40. doi: 10.1126/science.1246729. Srinivasan V, Pierik AJ, Lill R
Crystal structures of nucleotide-free and glutathione-bound mitochondrial ABC transporter Atm1.
Science. 2014 Mar 7;343(6175):1137-40. doi: 10.1126/science.1246729., [PMID:24604199]
Abstract [show]
The yeast mitochondrial ABC transporter Atm1, in concert with glutathione, functions in the export of a substrate required for cytosolic-nuclear iron-sulfur protein biogenesis and cellular iron regulation. Defects in the human ortholog ABCB7 cause the sideroblastic anemia XLSA/A. Here, we report the crystal structures of free and glutathione-bound Atm1 in inward-facing, open conformations at 3.06- and 3.38-angstrom resolution, respectively. The glutathione binding site includes a residue mutated in XLSA/A and is located close to the inner membrane surface in a large cavity. The two nucleotide-free adenosine 5'-triphosphate binding domains do not interact yet are kept in close vicinity through tight interaction of the two C-terminal alpha-helices of the Atm1 dimer. The resulting protein stabilization may be a common structural feature of all ABC exporters.
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No. Sentence Comment
91 Three of the XLSA/A patient mutations are located in the membrane domain either on the matrix [E208D in long TM2 helix; yeast E173 (29)] or intermembrane space sides (I400M between TM5 and TM6, yeast V365 (26); V411L in TM6, yeast V376 (28)] (Fig. 2A and fig. S1A).
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ABCB7 p.Glu208Asp 24604199:91:95
status: NEW92 (In the mutants, other amino acids were substituted at certain locations; for example, E208D indicates that glutamic acid at position 208 was replaced by aspartic acid.)
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ABCB7 p.Glu208Asp 24604199:92:87
status: NEWX
ABCB7 p.Glu208Asp 24604199:92:108
status: NEW[hide] The role of mitochondria and the CIA machinery in ... Eur J Cell Biol. 2015 Jul-Sep;94(7-9):280-91. doi: 10.1016/j.ejcb.2015.05.002. Epub 2015 May 31. Lill R, Dutkiewicz R, Freibert SA, Heidenreich T, Mascarenhas J, Netz DJ, Paul VD, Pierik AJ, Richter N, Stumpfig M, Srinivasan V, Stehling O, Muhlenhoff U
The role of mitochondria and the CIA machinery in the maturation of cytosolic and nuclear iron-sulfur proteins.
Eur J Cell Biol. 2015 Jul-Sep;94(7-9):280-91. doi: 10.1016/j.ejcb.2015.05.002. Epub 2015 May 31., [PMID:26099175]
Abstract [show]
Mitochondria have been derived from alpha-bacterial endosymbionts during the evolution of eukaryotes. Numerous bacterial functions have been maintained inside the organelles including fatty acid degradation, citric acid cycle, oxidative phosphorylation, and the synthesis of heme or lipoic acid cofactors. Additionally, mitochondria have inherited the bacterial iron-sulfur cluster assembly (ISC) machinery. Many of the ISC components are essential for cell viability because they generate a still unknown, sulfur-containing compound for the assembly of cytosolic and nuclear Fe/S proteins that perform important functions in, e.g., protein translation, DNA synthesis and repair, and chromosome segregation. The sulfur-containing compound is exported by the mitochondrial ABC transporter Atm1 (human ABCB7) and utilized by components of the cytosolic iron-sulfur protein assembly (CIA) machinery. An appealing minimal model for the striking compartmentation of eukaryotic Fe/S protein biogenesis is provided by organisms that contain mitosomes instead of mitochondria. Mitosomes have been derived from mitochondria by reductive evolution, during which they have lost virtually all classical mitochondrial tasks. Nevertheless, mitosomes harbor all core ISC components which presumably have been maintained for assisting the maturation of cytosolic-nuclear Fe/S proteins. The current review is centered around the Atm1 export process. We present an overview on the mitochondrial requirements for the export reaction, summarize recent insights into the 3D structure and potential mechanism of Atm1, and explain how the CIA machinery uses the mitochondrial export product for the assembly of cytosolic and nuclear Fe/S proteins.
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No. Sentence Comment
301 All mutated residues are located in the membrane domain either on the matrix (E208D in long TM2 helix; yeast E173 D`Hooghe et al., 2012) or intermembrane space sides (I400M between TM5-TM6, yeast V365 (Allikmets et al., 1999); V411L in TM6, yeast V376 (Maguire et al., 2001) (Fig. 4).
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ABCB7 p.Glu208Asp 26099175:301:78
status: NEW