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Bovine Complex I Is a Complex of 45 Different Subunits
Open accessAbstract
Mammalian mitochondrial complex I is a multisubunit membrane-bound assembly with a molecular mass approaching 1 MDa. By comprehensive analyses of the bovine complex and its constituent subcomplexes, 45 different subunits have been characterized previously. The presence of a 46th subunit was suspected from the consistent detection of a molecular mass of 10,566 by electrospray ionization mass spectrometry of subunits fractionated by reverse-phase high pressure liquid chromatography. The component was found associated with both the intact complex and subcomplex Ibeta, which represents most of the membrane arm of the complex, and it could not be resolved chromatographically from subunit SGDH (the subunit of bovine complex I with the N-terminal sequence Ser-Gly-Asp-His). It has now been characterized by tandem mass spectrometry of intact protein ions and shown to be a C-terminal fragment of subunit SGDH arising from a specific peptide bond cleavage between Ile-55 and Pro-56 during the electrospray ionization process. Thus, the subunit composition of bovine complex I has been established. It is a complex of 45 different proteins plus non-covalently bound FMN and eight iron-sulfur clusters.
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Electrospray Ionization for Mass Spectrometry of Large Biomolecules
Fenn, J. B., Mann, M., Meng, C. K., Wong, S. F., & Whitehouse, C. M. (1989) · Science · doi:10.1126/science.2675315 · Cited by 7,634
Cited by
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Crystal structure of the entire respiratory complex I
Baradaran, R., Berrisford, J. M., Minhas, G. S., & Sazanov, L. A. (2013) · Nature · doi:10.1038/nature11871 · Cited by 797
Cardioprotection by S-nitrosation of a cysteine switch on mitochondrial complex I
Chouchani, E. T., Methner, C., Nadtochiy, S. M., Logan, A., Pell, V. R., Ding, S., James, A. M., Cochemé, H. M., Reinhold, J., Lilley, K. S., et al. (2013) · Nature Medicine · doi:10.1038/nm.3212 · Cited by 619
Self-citationMitochondrial respiratory complex I: Structure, function and implication in human diseases
Sharma, L., Lu, J., & Bai, Y. (2009) · Current Medicinal Chemistry · doi:10.2174/092986709787846578 · Cited by 438
Understanding mitochondrial complex I assembly in health and disease
Mimaki, M., Wang, X., McKenzie, M., Thorburn, D. R., & Ryan, M. T. (2012) · Biochimica et Biophysica Acta (BBA) - Bioenergetics · doi:10.1016/j.bbabio.2011.08.010 · Cited by 420
Metadata
- Authors
- Carroll, J., Fearnley, I. M., Skehel, J. M., Shannon, R. J., Hirst, J., & Walker, J. E.
- Venue
- Journal of Biological Chemistry
- Publisher
- Elsevier BV
- Published
- 2006-10
- Volume
- 281
- Issue
- 43
- Pages
- 32724-32727
- ISSN
- 0021-9258 (ISSN-L)
- OpenAlex
- W2060271974
- Cited by
- 487
- References
- 1
- FWCI
- 12.03
- Type
- journal article
- Language
- en
- Open access
- hybrid
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