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| Title | Structural basis for different membrane-binding properties of E. coli anaerobic and human mitochondrial β-oxidation trifunctional enzymes. |
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| Journal, issue, pages | Structure, Vol. 31, Issue 7, Page 812-825.e6, Year 2023 |
| Publish date | Jul 6, 2023 |
 Authors | Shiv K Sah-Teli / Matyas Pinkas / Mikko J Hynönen / Sarah J Butcher / Rik K Wierenga / Jiri Novacek / Rajaram Venkatesan /   |
| PubMed Abstract | Facultative anaerobic bacteria such as Escherichia coli have two αβ heterotetrameric trifunctional enzymes (TFE), catalyzing the last three steps of the β-oxidation cycle: soluble aerobic TFE ...Facultative anaerobic bacteria such as Escherichia coli have two αβ heterotetrameric trifunctional enzymes (TFE), catalyzing the last three steps of the β-oxidation cycle: soluble aerobic TFE (EcTFE) and membrane-associated anaerobic TFE (anEcTFE), closely related to the human mitochondrial TFE (HsTFE). The cryo-EM structure of anEcTFE and crystal structures of anEcTFE-α show that the overall assembly of anEcTFE and HsTFE is similar. However, their membrane-binding properties differ considerably. The shorter A5-H7 and H8 regions of anEcTFE-α result in weaker α-β as well as α-membrane interactions, respectively. The protruding H-H region of anEcTFE-β is therefore more critical for membrane-association. Mutational studies also show that this region is important for the stability of the anEcTFE-β dimer and anEcTFE heterotetramer. The fatty acyl tail binding tunnel of the anEcTFE-α hydratase domain, as in HsTFE-α, is wider than in EcTFE-α, accommodating longer fatty acyl tails, in good agreement with their respective substrate specificities. |
 External links | Structure / PubMed:37192613 |
| Methods | EM (single particle) |
| Resolution | 3.55 - 10.3 Å |
| Structure data | EMDB-16134, PDB-8bnr: EMDB-16135, PDB-8bnu: EMDB-16217, PDB-8brj: |
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 Keywords |  MEMBRANE PROTEIN / complex / heterooctamer / heterotetramer / heterotrimer |
