Abstract
The understanding of mitochondrial functioning is of prime importance since it combines the production of energy as adenosine triphosphate (ATP) with an efficient chain of redox reactions, but also with the unavoidable production of reactive oxygen species (ROS) involved in aging. Mitochondrial respiration may be uncoupled from ATP synthesis by a proton leak induced by the thermogenic uncoupling protein 1 (UCP1). Mild uncoupling activity, as proposed for UCP2, UCP3, and avian UCP could theoretically control ROS production, but the nature of their transport activities is far from being definitively understood. The recent discovery of a UCP1 gene in fish has balanced the evolutionary view of uncoupling protein history. The thermogenic proton transport of mammalian UCP1 seems now to be a late evolutionary characteristic and the hypothesis that ancestral UCPs may carry other substrates is tempting. Using in silico genome analyses among taxa and a biochemical approach, we present a detailed phylogenetic analysis of UCPs and investigate whether avian UCP is a good candidate for pleiotropic mitochondrial activities, knowing that only one UCP has been characterized in the avian genome, unlike all other vertebrates. We show, here, that the avian class seems to be the only vertebrate lineage lacking two of the UCP1/2/3 homologues present in fish and mammals. We suggest, based on phylogenetic evidence and synteny of the UCP genes, that birds have lost UCP1 and UCP2. The phylogeny also supports the history of two rounds of duplication during vertebrate evolution. The avian uncoupling protein then represents a unique opportunity to explore how UCPs’ activities are controlled, but also to understand why birds exhibit such a particular relationship between high metabolism and slow rate of aging.
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Acknowledgments
The authors wish to thank Pr G. Lecointre and H. Gachot-Neveu for fruitful discussions on the roles and phylogeny of uncoupling proteins and help with phylogenic analysis, and A. Haguenauer for the sequence of avian BMCP1, discovered by S. Raimbault, to whose memory this paper is dedicated.
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Annex
NCBI reference number of protein sequences used for phylogenic inference analysis.
ANT Ath (BAB11273); ANT Dme (Q26365), ANT Hsa1 (P12235), ANT Ocu (O46373), ANT Ssc1 (AAD20940), ANT Gga (BAC15373), ANT Hsa2 (P05141), ANT Hsa3 (P12236), ANT Cfa (XP532844), ANT Ssc3 (Q6QRN9), BMCP1 Hsa (O95258), BMCP1 Mmu (Q922B2), BMCP1 Rno (CAC20901), KMCP1 Has (see ref. 6), BMCP Dme A (AAN11881), BMCP Dme B (NP 729138), UCP4 Dme (AAF48769), UCP4 Bta (XP 604084), UCP4b Rno (CAC20889), UCP4c Rno (CAC20900), UCP4a Rno (CAC20898), UCP4Xla (AAO26203), UCP Stu (CAB60277), UCP Ath (AAL07121), UCP1 Cfa (Q9GM21), UCP1 Hsa (P25874), UCP1 Bta (P10861), UCP1 Ocu (P14271), UCP1 Mmu (P12242), UCP1 Rno (NP036814), UCP1 Psu (AAG33983), UCP1 Mau (P04575), UCP2 Pma (AAL92117), UCP3 Afl (AAS45212), UCP3 Psu (AAG33985), UCP3 Mmu (NP 033490), UCP3 Rno (NP037299), UCP3 Hsa (NP003347), UCP3 Bta (077792), UCP3 Ssc (NP999214), UCP3 Cfa (Q9N2I9), UCP Ema (AAK16829), UCP Apa (AAT05613), UCP Gga (BAC 15532), UCP Mga (AAL28138), UCP3 Dre (see ref. 12), UCP1 Dre (see ref. 12), UCP2 Ssc (O97562), UCP2 Mmu (P70406), UCP2 Rno (NP062227), UCP2 Psu (AAG33984), UCP2 Hsa (NP003346), UCP2 Cfa (Q9N2J1), UCP2 Sma (AAP45779), UCP2 Afl (see ref. 34), UCP2 Xla (AAH44682), UCP2 Cca (Q9W725), UCP2 Dre (Q9W720).
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Emre, Y., Hurtaud, C., Ricquier, D. et al. Avian UCP: The Killjoy in the Evolution of the Mitochondrial Uncoupling Proteins. J Mol Evol 65, 392–402 (2007). https://doi.org/10.1007/s00239-007-9020-1
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DOI: https://doi.org/10.1007/s00239-007-9020-1