Structure of the Signal Sequences for Two Mitochondrial Matrix Proteins That Are Not Proteolytically Processed upon Import
| Autor: | David G. Gorenstein, Henry Weiner, Philip K. Hammen |
|---|---|
| Rok vydání: | 1994 |
| Předmět: |
Signal peptide
Circular dichroism Magnetic Resonance Spectroscopy Molecular Sequence Data Mutant Mitochondria Liver Protein Sorting Signals Biology Rhodanese Biochemistry Micelle Signal Protein Structure Secondary Animals Amino Acid Sequence Acetyl-CoA C-Acetyltransferase Micelles Thiolase Circular Dichroism Biological Transport Trifluoroethanol Thiosulfate Sulfurtransferase Mitochondria Rats Solutions Mitochondrial matrix Liposomes Biophysics |
| Zdroj: | Biochemistry. 33:8610-8617 |
| ISSN: | 1520-4995 0006-2960 |
| DOI: | 10.1021/bi00194a028 |
| Popis: | The N-terminal sequences of rhodanese and 3-oxoacyl-CoA thiolase, two mitochondrial matrix proteins that are not proteolytically processed upon import, have been studied by NMR and CD spectroscopy. In aqueous trifluoroethanol, in the presence of micelles, and in the presence of small unilamellar vesicles (SUVs), these peptides form alpha-helical structures beginning near the N-terminus and extending, continuously, for at least three helical turns. This result is consistent with a previous finding that a mutant rat liver mitochondrial aldehyde dehydrogenase signal sequence we designed, which formed a continuous alpha-helix, could successfully direct protein import but was not proteolytically processed (Thornton, K., Wang, Y., Weiner, H., & Gorenstein, D. G. (1993) J. Biol. Chem. 268, 19906-19914). From these three examples, a model is developed which suggests that a mitochondrial signal sequence that has an N-terminal alpha-helix longer than 11 residues can take on the necessary conformation to be imported but cannot adopt the necessary conformation to be processed. |
| Databáze: | OpenAIRE |
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