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==Crystal structure of peroxisomal citrate synthase (Cit2) from Saccharomyces cerevisiae in complex with oxaloacetate and coenzyme-A== | |||
<StructureSection load='8gr9' size='340' side='right'caption='[[8gr9]], [[Resolution|resolution]] 1.48Å' scene=''> | |||
== Structural highlights == | |||
<table><tr><td colspan='2'>[[8gr9]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Saccharomyces_cerevisiae Saccharomyces cerevisiae]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=8GR9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=8GR9 FirstGlance]. <br> | |||
</td></tr><tr id='ligand'><td class="sblockLbl"><b>[[Ligand|Ligands:]]</b></td><td class="sblockDat" id="ligandDat"><scene name='pdbligand=CL:CHLORIDE+ION'>CL</scene>, <scene name='pdbligand=COA:COENZYME+A'>COA</scene>, <scene name='pdbligand=GOL:GLYCEROL'>GOL</scene>, <scene name='pdbligand=K:POTASSIUM+ION'>K</scene>, <scene name='pdbligand=OAA:OXALOACETATE+ION'>OAA</scene></td></tr> | |||
<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=8gr9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=8gr9 OCA], [https://pdbe.org/8gr9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=8gr9 RCSB], [https://www.ebi.ac.uk/pdbsum/8gr9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=8gr9 ProSAT]</span></td></tr> | |||
</table> | |||
== Function == | |||
[https://www.uniprot.org/uniprot/A0A6A5Q445_YEASX A0A6A5Q445_YEASX] | |||
<div style="background-color:#fffaf0;"> | |||
== Publication Abstract from PubMed == | |||
Deficiencies in mitochondrial protein import are associated with a number of diseases. However, although nonimported mitochondrial proteins are at great risk of aggregation, it remains largely unclear how their accumulation causes cell dysfunction. Here, we show that nonimported citrate synthase is targeted for proteasomal degradation by the ubiquitin ligase SCF(Ucc1). Unexpectedly, our structural and genetic analyses revealed that nonimported citrate synthase appears to form an enzymatically active conformation in the cytosol. Its excess accumulation caused ectopic citrate synthesis, which, in turn, led to an imbalance in carbon flux of sugar, a reduction of the pool of amino acids and nucleotides, and a growth defect. Under these conditions, translation repression is induced and acts as a protective mechanism that mitigates the growth defect. We propose that the consequence of mitochondrial import failure is not limited to proteotoxic insults, but that the accumulation of a nonimported metabolic enzyme elicits ectopic metabolic stress. | |||
Defective import of mitochondrial metabolic enzyme elicits ectopic metabolic stress.,Nishio K, Kawarasaki T, Sugiura Y, Matsumoto S, Konoshima A, Takano Y, Hayashi M, Okumura F, Kamura T, Mizushima T, Nakatsukasa K Sci Adv. 2023 Apr 14;9(15):eadf1956. doi: 10.1126/sciadv.adf1956. Epub 2023 Apr , 14. PMID:37058555<ref>PMID:37058555</ref> | |||
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.<br> | |||
[[Category: | </div> | ||
<div class="pdbe-citations 8gr9" style="background-color:#fffaf0;"></div> | |||
== References == | |||
<references/> | |||
__TOC__ | |||
</StructureSection> | |||
[[Category: Large Structures]] | |||
[[Category: Saccharomyces cerevisiae]] | |||
[[Category: Kamura T]] | |||
[[Category: Mizushima T]] | |||
[[Category: Nakatsukasa K]] | |||
[[Category: Nishio K]] | |||
Revision as of 20:08, 26 April 2023
Crystal structure of peroxisomal citrate synthase (Cit2) from Saccharomyces cerevisiae in complex with oxaloacetate and coenzyme-ACrystal structure of peroxisomal citrate synthase (Cit2) from Saccharomyces cerevisiae in complex with oxaloacetate and coenzyme-A
Structural highlights
FunctionPublication Abstract from PubMedDeficiencies in mitochondrial protein import are associated with a number of diseases. However, although nonimported mitochondrial proteins are at great risk of aggregation, it remains largely unclear how their accumulation causes cell dysfunction. Here, we show that nonimported citrate synthase is targeted for proteasomal degradation by the ubiquitin ligase SCF(Ucc1). Unexpectedly, our structural and genetic analyses revealed that nonimported citrate synthase appears to form an enzymatically active conformation in the cytosol. Its excess accumulation caused ectopic citrate synthesis, which, in turn, led to an imbalance in carbon flux of sugar, a reduction of the pool of amino acids and nucleotides, and a growth defect. Under these conditions, translation repression is induced and acts as a protective mechanism that mitigates the growth defect. We propose that the consequence of mitochondrial import failure is not limited to proteotoxic insults, but that the accumulation of a nonimported metabolic enzyme elicits ectopic metabolic stress. Defective import of mitochondrial metabolic enzyme elicits ectopic metabolic stress.,Nishio K, Kawarasaki T, Sugiura Y, Matsumoto S, Konoshima A, Takano Y, Hayashi M, Okumura F, Kamura T, Mizushima T, Nakatsukasa K Sci Adv. 2023 Apr 14;9(15):eadf1956. doi: 10.1126/sciadv.adf1956. Epub 2023 Apr , 14. PMID:37058555[1] From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine. References
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