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Packing of transmembrane domain 2 of carnitine palmitoyltransferase-1A affects oligomerization and malonyl-CoA sensitivity of the mitochondrial outer membrane protein
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Jenei, Z. A., Warren, Gemma, Hasan, M., Zammit, V. A. (Victor A.) and Dixon, Ann M.. (2011) Packing of transmembrane domain 2 of carnitine palmitoyltransferase-1A affects oligomerization and malonyl-CoA sensitivity of the mitochondrial outer membrane protein. FASEB Journal, Vol.25 (No.12). pp. 4522-4530. ISSN 0892-6638
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Official URL: http://dx.doi.org/10.1096/fj.11-192005
Abstract
The purpose of this study was to investigate the sequence-dependence of oligomerization of transmembrane domain 2 (TM2) of rat carnitine palmitoyltransferase 1A (rCPT1A), to elucidate the role of this domain in the function of the full-length enzyme. Oligomerization of TM2 was studied qualitatively using complementary genetic assays that facilitate measurement of helix-helix interactions in the Escherichia coli inner membrane, and multiple quantitative biophysical methods. The effects of TM2-mutations on oligomerization and malonyl-CoA inhibition of the full-length enzyme (expressed in the yeast Pichia pastoris) were quantified. Changes designed to disrupt close-packing of the GXXXG(A) motifs reduced the oligomeric state of the corresponding TM2 peptides from hexamer to trimer (or lower), a reduction also observed on mutation of the TM2 sequence in the full-length enzyme. Disruption of these GXXXG(A) motifs had a parallel effect on the malonyl-CoA sensitivity of rCPT1A, reducing the IC50 from 30.3 ± 5.0 to 3.0 ± 0.6 μM. For all measurements, wild-type rCPT1A was used as a control alongside various appropriate (e.g., molecular mass) standards. Our results suggest that sequence-determined, TM2-mediated oligomerization is likely to be involved in the modulation of malonyl-CoA inhibition of CPT1A in response to short- and long-term changes in protein-protein and protein-lipid interactions that occur in vivo. —Jenei, Z. A., Warren, G. Z. L., Hasan, M., Zammit, V. A., Dixon, A. M. Packing of transmembrane domain 2 of carnitine palmitoyltransferase-1A affects oligomerization and malonyl-CoA sensitivity of the mitochondrial outer membrane protein.
| Item Type: | Journal Article |
|---|---|
| Subjects: | Q Science > QD Chemistry Q Science > QP Physiology R Medicine > RC Internal medicine |
| Divisions: | Faculty of Science > Chemistry Faculty of Medicine > Warwick Medical School > Metabolic and Vascular Health Faculty of Medicine > Warwick Medical School |
| Library of Congress Subject Headings (LCSH): | Fatty acids -- Metabolism, Diabetes -- Pathophysiology, Ultracentrifugation, Membrane proteins |
| Journal or Publication Title: | FASEB Journal |
| Publisher: | Federation of American Societies for Experimental Biology |
| ISSN: | 0892-6638 |
| Date: | December 2011 |
| Volume: | Vol.25 |
| Number: | No.12 |
| Page Range: | pp. 4522-4530 |
| Identification Number: | 10.1096/fj.11-192005 |
| Status: | Peer Reviewed |
| Publication Status: | Published |
| Access rights to Published version: | Restricted or Subscription Access |
| URI: | http://wrap.warwick.ac.uk/id/eprint/40211 |
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