Mitochondrial Membranes Restitution Proceeds via Vesicular Import from ER and Cytosol. Counterparts’ Resemblances and Variances in Mitochondria and Golgi PathwaysReport as inadecuate




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The processes of mitochondrial restitution are controlled by nuclear genes that encode proteins synthesized in ER and cytosol and delivered as organelle- and membrane-specific transport vesicles. The analysis of the transporters recovered from inner mitochondrial space Mitosol revealed that the ER-synthesized mitochondria-specific transport vesicles consist of two carriers, one remaining in outer mitochondrial membrane OMM, and the other that transfers specific membrane segments to the inner mitochondrial membrane IMM. The ER-assembled and IMM-committed membrane segments, while first integrated into OMM, undergo intra-mitochondrial lipid modification reflected in the synthesis of cardiolipin CL and inversion into Mitosol with load of IMM associated cytosolic proteins. Then, the CL-bedecked vesicles are released from OMM to Mitosol and upon contact with IMM fuse with the membrane, and the release of cytosolic cargo ensues. While ER-assembled mitochondria-specific transport vesicles fuse with OMM with the aid of the cytosolic, phosphatidylglycerol PG-specific phospholipase A2 PLA2, the Mitosol-contained CL-specific PLA guides vesicles fusion with IMM. The described path of translocation of the membrane segments and the cytosol synthesized proteins into the designated mitochondrial compartments sustains growth and identity of OMM, IMM, maintains protein delivery for intra-mitochondrial lipid and protein modification in Mitosol, and ensures conformity of the cytosolic proteins cargo delivered to matrix.

KEYWORDS

Mitochondrial Restitution, ER Vesicular Transport, Mitochondrial Membranes, Cardiolipin, Mitosol Vesicles

Cite this paper

Slomiany, A. and Slomiany, B. 2017 Mitochondrial Membranes Restitution Proceeds via Vesicular Import from ER and Cytosol. Counterparts’ Resemblances and Variances in Mitochondria and Golgi Pathways. Advances in Biological Chemistry, 7, 1-26. doi: 10.4236-abc.2017.71001.





Author: Amalia Slomiany, Bronislaw L. Slomiany

Source: http://www.scirp.org/



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