VDAC3

The three VDAC isoforms in human are highly conserved, particularly with respect to their 3D structure. VDACs form a wide β-barrel structure, inside of which the N-terminal resides to partially close the pore. The sequence of the VDAC3 isoform contains an abundance of cysteines, which allow for the formation of disulfide bridges and, ultimately, affect the flexibility of the β-barrel. VDACs also contain a mitochondrial targeting sequence for the protein's translocation to the outer mitochondrial membrane.{{cite journal | vauthors = De Pinto V, Messina A, Lane DJ, Lawen A | title = Voltage-dependent anion-selective channel (VDAC) in the plasma membrane | journal = FEBS Letters | volume = 584 | issue = 9 | pages = 1793–9 | date = May 2010 | pmid = 20184885 | doi = 10.1016/j.febslet.2010.02.049 | s2cid = 3391282 | doi-access = free | bibcode = 2010FEBSL.584.1793D }} VDAC3 still yet possesses multiple isoforms, including a full-length form and shorter form termed VDAC3b. This shorter form is predominantly expressed over the full-length form at cell centrosomes.

VDAC3 belongs to the mitochondrial porin family and is expected to share similar biological functions to the other VDAC isoforms. VDACs are involved in cell metabolism by transporting ATP and other small metabolites across the outer mitochondrial membrane. In addition, VDACs form part of the mitochondrial permeability transition pore (MPTP) and, thus, facilitate cytochrome C release, leading to apoptosis.{{cite web|title=Entrez Gene: voltage-dependent anion channel 3|url=https://www.ncbi.nlm.nih.gov/gene/7419}} VDACs have also been observed to interact with pro- or antiapoptotic proteins, such as Bcl-2 family proteins and kinases, and so may contribute to apoptosis independently from the MPTP.{{cite journal | vauthors = Lee MJ, Kim JY, Suk K, Park JH | title = Identification of the hypoxia-inducible factor 1 alpha-responsive HGTD-P gene as a mediator in the mitochondrial apoptotic pathway | journal = Molecular and Cellular Biology | volume = 24 | issue = 9 | pages = 3918–27 | date = May 2004 | pmid = 15082785 | doi=10.1128/mcb.24.9.3918-3927.2004 | pmc=387743}} Nonetheless, experiments reveal a lack of pore-forming ability in the VDAC3 isoform, suggesting that it may perform different biological functions.{{cite journal | vauthors = De Pinto V, Guarino F, Guarnera A, Messina A, Reina S, Tomasello FM, Palermo V, Mazzoni C | title = Characterization of human VDAC isoforms: a peculiar function for VDAC3? | journal = Biochimica et Biophysica Acta (BBA) - Bioenergetics | volume = 1797 | issue = 6–7 | pages = 1268–75 | date = 2010 | pmid = 20138821 | doi = 10.1016/j.bbabio.2010.01.031 | doi-access = free }} Notably, though all VDAC isoforms are ubiquitously expressed, VDAC3 is mostly found in the sperm outer dense fiber (ODF), where it is hypothesized to promote proper assembly and maintenance of sperm flagella. Because the ODF membranes are not likely to support pore formation, VDAC3 may interact with protein partners to carry out other functions in the ODF.{{cite journal | vauthors = Hinsch KD, De Pinto V, Aires VA, Schneider X, Messina A, Hinsch E | title = Voltage-dependent anion-selective channels VDAC2 and VDAC3 are abundant proteins in bovine outer dense fibers, a cytoskeletal component of the sperm flagellum | journal = The Journal of Biological Chemistry | volume = 279 | issue = 15 | pages = 15281–8 | date = Apr 2004 | pmid = 14739283 | doi = 10.1074/jbc.M313433200 | doi-access = free }} For instance, within cells, VDAC3 predominantly localizes to the centrosome and recruits Mps1 to regulate centriole assembly. In the case of localization to the mitochondria, VDAC3 interaction with Mps1 instead leads to ciliary disassembly.

VDAC3 belongs to a group of mitochondrial membrane channels involved in translocation of adenine nucleotides through the outer membrane. These channels may also function as a mitochondrial binding site for hexokinase and glycerol kinase. The VDAC is an important constituent in apoptotic signaling and oxidative stress, most notably as part of the mitochondrial death pathway and cardiac myocyte apoptosis signaling.{{cite journal | vauthors = Danial NN, Korsmeyer SJ | title = Cell death: critical control points | journal = Cell | volume = 116 | issue = 2 | pages = 205–19 | date = Jan 2004 | pmid = 14744432 | doi=10.1016/S0092-8674(04)00046-7| s2cid = 10764012 | doi-access = free }} Programmed cell death is a distinct genetic and biochemical pathway essential to metazoans. An intact death pathway is required for successful embryonic development and the maintenance of normal tissue homeostasis. Apoptosis has proven to be tightly interwoven with other essential cell pathways. The identification of critical control points in the cell death pathway has yielded fundamental insights for basic biology, as well as provided rational targets for new therapeutics 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.{{cite journal | vauthors = Kerr JF, Wyllie AH, Currie AR | title = Apoptosis: a basic biological phenomenon with wide-ranging implications in tissue kinetics | journal = British Journal of Cancer | volume = 26 | issue = 4 | pages = 239–57 | date = Aug 1972 | pmid = 4561027 | doi=10.1038/bjc.1972.33 | pmc=2008650}} 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.

In addition, VDAC3 has been implicated in cardioprotection against ischemia-reperfusion injury, such as during ischemic preconditioning of the heart.{{cite journal | vauthors = Liem DA, Honda HM, Zhang J, Woo D, Ping P | title = Past and present course of cardioprotection against ischemia-reperfusion injury | journal = Journal of Applied Physiology | volume = 103 | issue = 6 | pages = 2129–36 | date = Dec 2007 | pmid = 17673563 | doi = 10.1152/japplphysiol.00383.2007 | s2cid = 24815784 }} Although a large burst of reactive oxygen species is known to lead to cell damage, a moderate release of ROS from the mitochondria, which occurs during nonlethal short episodes of ischemia, can play a significant triggering role in the signal transduction pathways of ischemic preconditioning leading to reduction of cell damage. It has even been observed that during this release of reactive oxygen species, VDAC3 plays an important role in the mitochondrial cell death pathway transduction hereby regulating apoptotic signaling and cell death.

As VDAC3 is a regulator of sperm motility, male mice missing VDAC3 result in infertility. Mutations in VDAC3 are also associated with Parkinson's disease, as VDAC3 has been observed to target Parkin to defective mitochondria to eliminate them by mitophagy. Failure to eliminate these mitochondria result in the accumulation of reactive oxygen species, the commonly attributed cause of Parkinson's disease. In addition, it has been found that VDAC3-null mice were born at the expected mendelian ratio. Mutant females were fertile, but males were not due to markedly reduced sperm motility.{{cite journal | vauthors = Sampson MJ, Decker WK, Beaudet AL, Ruitenbeek W, Armstrong D, Hicks MJ, Craigen WJ | title = Immotile sperm and infertility in mice lacking mitochondrial voltage-dependent anion channel type 3 | journal = The Journal of Biological Chemistry | volume = 276 | issue = 42 | pages = 39206–12 | date = Oct 2001 | pmid = 11507092 | doi = 10.1074/jbc.M104724200 | doi-access = free | hdl = 2066/185675 | hdl-access = free }} The majority of epididymal axonemes showed structural defects, most commonly loss of a single microtubule doublet at a conserved position within the axoneme. In testicular sperm, the defect was only rarely observed, suggesting that instability of a normally formed axoneme occurred during sperm maturation. In contrast, tracheal epithelial cilia showed no structural abnormalities, but there was a reduced number of ciliated cells. In skeletal muscle, mitochondria were abnormally shaped, and the activities of respiratory chain complex enzymes were reduced. Citrate synthase activity was unchanged, suggesting an absence of mitochondrial proliferation that commonly occurs in response to respiratory chain defects.

VDAC3 has been shown to interact with:

• Mps1
• Parkin

• Voltage-dependent anion channel

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• {{MeshName|VDAC3+protein,+human}}

{{Ion channels|g4}}

Category:Ion channels