This protein is a flavoprotein that functions as an NAD(P)H-dependent oxidoreductase and induces caspase- and p53-independent apoptosis. The exact mechanisms remain unknown, but AIFM2 is found to localize to the cytosol and the OMM. Thus, it may carry out this function by disrupting mitochondrial morphology and releasing proapoptotic factors. Also, under conditions of stress which activate p53-mediated apoptosis, such as hypoxia, AIMF2 may stabilize p53 by inhibiting its degradation and accelerate the apoptotic process. Under normal conditions (i.e., undetectable p53 expression), the AIFM2 gene is highly expressed in the heart, followed by liver and skeletal muscle, with low levels detected in the placenta, lung, kidney, and pancreas and the lowest in the brain. However, in organs such as the heart, there may be additional regulatory mechanisms to suppress its proapoptotic function. For instance, AIFM2 may be able to directly bind nuclear DNA and effect chromatin condensation, as with AIF. Furthermore, AIMF2 expressed at low levels may function as an oxidoreductase involved in metabolism. Hence, under normal cellular conditions, AIFM2 may promote cell survival rather than death by metabolic processes such as generating reactive oxygen species (ROS) to maintain survival signaling.
Inhibitors of FSP1 have been identified to induce ferroptosis. icFSP1 has been shown to cause dissociation of FSP1 from the membrane and phase separation of FSP1 into droplets.
The phylogenetic studies indicates that the divergence of the AIFM1 and other AIFs occurred before the divergence of eukaryotes.
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Wu M, Xu LG, Li X, Zhai Z, Shu HB (July 2002). "AMID, an apoptosis-inducing factor-homologous mitochondrion-associated protein, induces caspase-independent apoptosis". The Journal of Biological Chemistry. 277 (28): 25617–23. doi:10.1074/jbc.M202285200. PMID 11980907. https://doi.org/10.1074%2Fjbc.M202285200
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
"Entrez Gene: AIFM2 apoptosis-inducing factor, mitochondrion-associated, 2". https://www.ncbi.nlm.nih.gov/sites/entrez?Db=gene&Cmd=ShowDetailView&TermToSearch=84883
Doll S, Freitas FP, Shah R, Aldrovandi M, da Silva MC, Ingold I, et al. (November 2019). "FSP1 is a glutathione-independent ferroptosis suppressor". Nature. 575 (7784): 693–698. Bibcode:2019Natur.575..693D. doi:10.1038/s41586-019-1707-0. hdl:10044/1/75345. PMID 31634899. S2CID 204833583. https://orca.cardiff.ac.uk/id/eprint/126674/
Bersuker K, Hendricks JM, Li Z, Magtanong L, Ford B, Tang PH, et al. (November 2019). "The CoQ oxidoreductase FSP1 acts parallel to GPX4 to inhibit ferroptosis". Nature. 575 (7784): 688–692. Bibcode:2019Natur.575..688B. doi:10.1038/s41586-019-1705-2. PMC 6883167. PMID 31634900. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6883167
Bersuker K, Hendricks JM, Li Z, Magtanong L, Ford B, Tang PH, et al. (November 2019). "The CoQ oxidoreductase FSP1 acts parallel to GPX4 to inhibit ferroptosis". Nature. 575 (7784): 688–692. Bibcode:2019Natur.575..688B. doi:10.1038/s41586-019-1705-2. PMC 6883167. PMID 31634900. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6883167
Doll S, Freitas FP, Shah R, Aldrovandi M, da Silva MC, Ingold I, et al. (November 2019). "FSP1 is a glutathione-independent ferroptosis suppressor". Nature. 575 (7784): 693–698. Bibcode:2019Natur.575..693D. doi:10.1038/s41586-019-1707-0. hdl:10044/1/75345. PMID 31634899. S2CID 204833583. https://orca.cardiff.ac.uk/id/eprint/126674/
Doll S, Freitas FP, Shah R, Aldrovandi M, da Silva MC, Ingold I, et al. (November 2019). "FSP1 is a glutathione-independent ferroptosis suppressor". Nature. 575 (7784): 693–698. Bibcode:2019Natur.575..693D. doi:10.1038/s41586-019-1707-0. hdl:10044/1/75345. PMID 31634899. S2CID 204833583. https://orca.cardiff.ac.uk/id/eprint/126674/
Bersuker K, Hendricks JM, Li Z, Magtanong L, Ford B, Tang PH, et al. (November 2019). "The CoQ oxidoreductase FSP1 acts parallel to GPX4 to inhibit ferroptosis". Nature. 575 (7784): 688–692. Bibcode:2019Natur.575..688B. doi:10.1038/s41586-019-1705-2. PMC 6883167. PMID 31634900. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6883167
Wu M, Xu LG, Li X, Zhai Z, Shu HB (July 2002). "AMID, an apoptosis-inducing factor-homologous mitochondrion-associated protein, induces caspase-independent apoptosis". The Journal of Biological Chemistry. 277 (28): 25617–23. doi:10.1074/jbc.M202285200. PMID 11980907. https://doi.org/10.1074%2Fjbc.M202285200
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Klim J, Gładki A, Kucharczyk R, Zielenkiewicz U, Kaczanowski S (May 2018). "Ancestral State Reconstruction of the Apoptosis Machinery in the Common Ancestor of Eukaryotes". G3. 8 (6): 2121–2134. doi:10.1534/g3.118.200295. PMC 5982838. PMID 29703784. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5982838
Wu M, Xu LG, Su T, Tian Y, Zhai Z, Shu HB (September 2004). "AMID is a p53-inducible gene downregulated in tumors". Oncogene. 23 (40): 6815–9. doi:10.1038/sj.onc.1207909. PMID 15273740. S2CID 8541615. /wiki/Doi_(identifier)
Wu M, Xu LG, Su T, Tian Y, Zhai Z, Shu HB (September 2004). "AMID is a p53-inducible gene downregulated in tumors". Oncogene. 23 (40): 6815–9. doi:10.1038/sj.onc.1207909. PMID 15273740. S2CID 8541615. /wiki/Doi_(identifier)
Wu M, Xu LG, Li X, Zhai Z, Shu HB (July 2002). "AMID, an apoptosis-inducing factor-homologous mitochondrion-associated protein, induces caspase-independent apoptosis". The Journal of Biological Chemistry. 277 (28): 25617–23. doi:10.1074/jbc.M202285200. PMID 11980907. https://doi.org/10.1074%2Fjbc.M202285200
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Wu M, Xu LG, Su T, Tian Y, Zhai Z, Shu HB (September 2004). "AMID is a p53-inducible gene downregulated in tumors". Oncogene. 23 (40): 6815–9. doi:10.1038/sj.onc.1207909. PMID 15273740. S2CID 8541615. /wiki/Doi_(identifier)
Gong M, Hay S, Marshall KR, Munro AW, Scrutton NS (October 2007). "DNA binding suppresses human AIF-M2 activity and provides a connection between redox chemistry, reactive oxygen species, and apoptosis". The Journal of Biological Chemistry. 282 (41): 30331–40. doi:10.1074/jbc.m703713200. PMID 17711848. https://doi.org/10.1074%2Fjbc.m703713200
Wu M, Xu LG, Li X, Zhai Z, Shu HB (July 2002). "AMID, an apoptosis-inducing factor-homologous mitochondrion-associated protein, induces caspase-independent apoptosis". The Journal of Biological Chemistry. 277 (28): 25617–23. doi:10.1074/jbc.M202285200. PMID 11980907. https://doi.org/10.1074%2Fjbc.M202285200
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Wu M, Xu LG, Su T, Tian Y, Zhai Z, Shu HB (September 2004). "AMID is a p53-inducible gene downregulated in tumors". Oncogene. 23 (40): 6815–9. doi:10.1038/sj.onc.1207909. PMID 15273740. S2CID 8541615. /wiki/Doi_(identifier)
Wu M, Xu LG, Li X, Zhai Z, Shu HB (July 2002). "AMID, an apoptosis-inducing factor-homologous mitochondrion-associated protein, induces caspase-independent apoptosis". The Journal of Biological Chemistry. 277 (28): 25617–23. doi:10.1074/jbc.M202285200. PMID 11980907. https://doi.org/10.1074%2Fjbc.M202285200
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Wu M, Xu LG, Li X, Zhai Z, Shu HB (July 2002). "AMID, an apoptosis-inducing factor-homologous mitochondrion-associated protein, induces caspase-independent apoptosis". The Journal of Biological Chemistry. 277 (28): 25617–23. doi:10.1074/jbc.M202285200. PMID 11980907. https://doi.org/10.1074%2Fjbc.M202285200
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Gong M, Hay S, Marshall KR, Munro AW, Scrutton NS (October 2007). "DNA binding suppresses human AIF-M2 activity and provides a connection between redox chemistry, reactive oxygen species, and apoptosis". The Journal of Biological Chemistry. 282 (41): 30331–40. doi:10.1074/jbc.m703713200. PMID 17711848. https://doi.org/10.1074%2Fjbc.m703713200
Wu M, Xu LG, Su T, Tian Y, Zhai Z, Shu HB (September 2004). "AMID is a p53-inducible gene downregulated in tumors". Oncogene. 23 (40): 6815–9. doi:10.1038/sj.onc.1207909. PMID 15273740. S2CID 8541615. /wiki/Doi_(identifier)
Wu M, Xu LG, Li X, Zhai Z, Shu HB (July 2002). "AMID, an apoptosis-inducing factor-homologous mitochondrion-associated protein, induces caspase-independent apoptosis". The Journal of Biological Chemistry. 277 (28): 25617–23. doi:10.1074/jbc.M202285200. PMID 11980907. https://doi.org/10.1074%2Fjbc.M202285200
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Wu M, Xu LG, Su T, Tian Y, Zhai Z, Shu HB (September 2004). "AMID is a p53-inducible gene downregulated in tumors". Oncogene. 23 (40): 6815–9. doi:10.1038/sj.onc.1207909. PMID 15273740. S2CID 8541615. /wiki/Doi_(identifier)
Doll S, Freitas FP, Shah R, Aldrovandi M, da Silva MC, Ingold I, et al. (November 2019). "FSP1 is a glutathione-independent ferroptosis suppressor". Nature. 575 (7784): 693–698. Bibcode:2019Natur.575..693D. doi:10.1038/s41586-019-1707-0. hdl:10044/1/75345. PMID 31634899. S2CID 204833583. https://orca.cardiff.ac.uk/id/eprint/126674/
Nakamura T, Hipp C, Santos Dias Mourão A, Borggräfe J, Aldrovandi M, Henkelmann B, Wanninger J, Mishima E, Lytton E, Emler D, Proneth B, Sattler M, Conrad M (July 2023). "Phase separation of FSP1 promotes ferroptosis". Nature. 619 (7969): 371–377. Bibcode:2023Natur.619..371N. doi:10.1038/s41586-023-06255-6. ISSN 1476-4687. PMC 10338336. PMID 37380771. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10338336
Klim J, Gładki A, Kucharczyk R, Zielenkiewicz U, Kaczanowski S (May 2018). "Ancestral State Reconstruction of the Apoptosis Machinery in the Common Ancestor of Eukaryotes". G3. 8 (6): 2121–2134. doi:10.1534/g3.118.200295. PMC 5982838. PMID 29703784. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5982838
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Ohiro Y, Garkavtsev I, Kobayashi S, Sreekumar KR, Nantz R, Higashikubo BT, Duffy SL, Higashikubo R, Usheva A, Gius D, Kley N, Horikoshi N (July 2002). "A novel p53-inducible apoptogenic gene, PRG3, encodes a homologue of the apoptosis-inducing factor (AIF)". FEBS Letters. 524 (1–3): 163–71. Bibcode:2002FEBSL.524..163O. doi:10.1016/S0014-5793(02)03049-1. PMID 12135761. S2CID 6972218. https://doi.org/10.1016%2FS0014-5793%2802%2903049-1
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200
Marshall KR, Gong M, Wodke L, Lamb JH, Jones DJ, Farmer PB, Scrutton NS, Munro AW (September 2005). "The human apoptosis-inducing protein AMID is an oxidoreductase with a modified flavin cofactor and DNA binding activity". The Journal of Biological Chemistry. 280 (35): 30735–40. doi:10.1074/jbc.M414018200. PMID 15958387. https://doi.org/10.1074%2Fjbc.M414018200