The DAP3 gene encodes a 46 kDa protein located in the lower area of the small mitoribosomal subunit.[9][12][13][14] This protein contains a P-loop motif that binds GTP and a highly conserved 17-residue targeting sequence responsible for its localization to the mitochondria.[9][11][12][13] Of interest, many of the phosphorylation sites on this protein are highly conserved and clustered around GTP-binding motifs.[9]
Several splice variants were observed in human ESTs that differ largely in the 5’ UTR region.[7][14] Pseudogenes for this gene are also found in chromosomes 1 and 2.[7]
As aforementioned, death associated protein 3 (DAP3) has regulatory roles in cell respiration and apoptosis. Both opposites and cell respiration are important elements of cell death pathways and have underlying mechanistic roles in ischemia-reperfusion injury.[15][16][17]
During a normal embryologic processes, or during cell injury (such as ischemia-reperfusion injury during heart attacks and strokes) or during developments and processes in cancer, an apoptotic cell undergoes structural changes including cell shrinkage, plasma membrane blebbing, nuclear condensation, and fragmentation of the DNA and nucleus. This is followed by fragmentation into apoptotic bodies that are quickly removed by phagocytes, thereby preventing an inflammatory response.[18] It is a mode of cell death defined by characteristic morphological, biochemical and molecular changes. It was first described as a "shrinkage necrosis", and then this term was replaced by apoptosis to emphasize its role opposite mitosis in tissue kinetics. In later stages of apoptosis the entire cell becomes fragmented, forming a number of plasma membrane-bounded apoptotic bodies which contain nuclear and or cytoplasmic elements. The ultrastructural appearance of necrosis is quite different, the main features being mitochondrial swelling, plasma membrane breakdown and cellular disintegration. Apoptosis occurs in many physiological and pathological processes. It plays an important role during embryonal development as programmed cell death and accompanies a variety of normal involutional processes in which it serves as a mechanism to remove "unwanted" cells.
^Kissil JL, Kimchi A (September 1997). "Assignment of death associated protein 3 (DAP3) to human chromosome 1q21 by in situ hybridization". Cytogenetics and Cell Genetics. 77 (3–4): 252. doi:10.1159/000134587. PMID9284927.
^ abcdefghijkWazir U, Jiang WG, Sharma AK, Mokbel K (Feb 2012). "The mRNA expression of DAP3 in human breast cancer: correlation with clinicopathological parameters". Anticancer Research. 32 (2): 671–4. PMID22287761.
^Gracia-Sancho J, Casillas-Ramírez A, Peralta C (Aug 2015). "Molecular pathways in protecting the liver from ischaemia/reperfusion injury: a 2015 update". Clinical Science. 129 (4): 345–62. doi:10.1042/CS20150223. PMID26014222.
^Ekert PG, Vaux DL (Dec 2005). "The mitochondrial death squad: hardened killers or innocent bystanders?". Current Opinion in Cell Biology. 17 (6): 626–30. doi:10.1016/j.ceb.2005.09.001. PMID16219456.
^ abKissil JL, Kimchi A (Jun 1998). "Death-associated proteins: from gene identification to the analysis of their apoptotic and tumour suppressive functions". Molecular Medicine Today. 4 (6): 268–74. doi:10.1016/s1357-4310(98)01263-5. PMID9679246.
Maruyama K, Sugano S (1994). "Oligo-capping: a simple method to replace the cap structure of eukaryotic mRNAs with oligoribonucleotides". Gene. 138 (1–2): 171–4. doi:10.1016/0378-1119(94)90802-8. PMID8125298.
Suzuki Y, Yoshitomo-Nakagawa K, Maruyama K, Suyama A, Sugano S (1997). "Construction and characterization of a full length-enriched and a 5'-end-enriched cDNA library". Gene. 200 (1–2): 149–56. doi:10.1016/S0378-1119(97)00411-3. PMID9373149.
Morgan CJ, Jacques C, Savagner F, Tourmen Y, Mirebeau DP, Malthièry Y, Reynier P (2001). "A conserved N-terminal sequence targets human DAP3 to mitochondria". Biochem. Biophys. Res. Commun. 280 (1): 177–81. doi:10.1006/bbrc.2000.4119. PMID11162496.
Kenmochi N, Suzuki T, Uechi T, Magoori M, Kuniba M, Higa S, Watanabe K, Tanaka T (2001). "The human mitochondrial ribosomal protein genes: mapping of 54 genes to the chromosomes and implications for human disorders". Genomics. 77 (1–2): 65–70. doi:10.1006/geno.2001.6622. PMID11543634.
Hulkko SM, Zilliacus J (2002). "Functional interaction between the pro-apoptotic DAP3 and the glucocorticoid receptor". Biochem. Biophys. Res. Commun. 295 (3): 749–55. doi:10.1016/S0006-291X(02)00713-1. PMID12099703.
Berger T, Kretzler M (2002). "TRAIL-induced apoptosis is independent of the mitochondrial apoptosis mediator DAP3". Biochem. Biophys. Res. Commun. 297 (4): 880–4. doi:10.1016/S0006-291X(02)02310-0. PMID12359235.
Zhang Z, Gerstein M (2003). "Identification and characterization of over 100 mitochondrial ribosomal protein pseudogenes in the human genome". Genomics. 81 (5): 468–80. doi:10.1016/S0888-7543(03)00004-1. PMID12706105.
Sasaki H, Ide N, Yukiue H, Kobayashi Y, Fukai I, Yamakawa Y, Fujii Y (2004). "Arg and DAP3 expression was correlated with human thymoma stage". Clin. Exp. Metastasis. 21 (6): 507–13. doi:10.1007/s10585-004-2153-3. PMID15679048. S2CID23560519.
External links
PDBe-KB provides an overview of all the structure information available in the PDB for Human 28S ribosomal protein S29, mitochondrial (DAP3)