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Linear kalilo DNA is a Neurospora mitochondrial plasmid that integrates into the mitochondrial DNA (1989)

Myers, Carolyn J. ; Griffiths, Anthony J. F. ; Bertrand, Helmut

Springer

Molecular genetics and genomics 220 (1989), S. 113-120

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ISSN: 1617-4623

Keywords: Neurospora ; Senescence ; Mitochondria ; Plasmid ; Kalilo

Source: Springer Online Journal Archives 1860-2000

Topics: Biology

Notes: Summary The linear autonomous form of kalilo DNA (previously called AR-kalDNA) is shown to be resident within mitochondria rather than nuclei, as had been suggested by previous experiments. This form has been renamed mtAR-kalDNA, to signify its mitochondrial location. Experiments are described that illustrate the inheritance and somatic transmission patterns of the mitochondrial kalilo plasmid and the mitochondrial inserted form of kalilo DNA (mtlS-kalDNA). Progeny of a cross with a pre-senescent subculture as the female parent inherited mtAR-ka1DNA only; mtIS-kalDNA was not transmitted sexually. During somatic propagation of the ascospore cultures, novel kalilo DNA inserts appeared and most of them persisted until death. We propose that these inserts originated from de novo integration of mtAR-kalDNA into the mitochondrial DNA. In two of the ascopore-derived series analyzed, the first inserts detected were seen only transiently and inserts appearing subsequent to the transient inserts were retained until death. We propose that these enduring inserts originated either from rearrangements of the transient inserts or from novel integration events, either from mtAR-kalDNA or from transposition of the transient inserts.

Type of Medium: Electronic Resource

URL: http://dx.doi.org/10.1007/BF00260864

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Solvent stabilization of the edge inversion transition state in tetrahedral molecules (1988)

Dixon, David A. ; Arduengo, Anthony J.

New York, NY : Wiley-Blackwell

International Journal of Quantum Chemistry 34 (1988), S. 85-98

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ISSN: 0020-7608

Keywords: Computational Chemistry and Molecular Modeling ; Atomic, Molecular and Optical Physics

Source: Wiley InterScience Backfile Collection 1832-2000

Topics: Chemistry and Pharmacology

Notes: The edge inversion process in phosphoric acid, PO(OH)3 has been studied by large scale ab initio molecular orbital theory. Edge inversion of the tetrahedral ground state via a square-planar transition state requires 69.5 kcal/mol (MP-2). Addition of two NH3 solvent molecules to the vacant NLUMO stabilizes the transition state by 45 kcal/mol (MP-2). The value for ΔH(300K) for the reaction 2NH3 + PO(OH)3 → PO(OH)3 · (NH3)2 is 24.1 kcal/mol (MP-2). The complex with two NH3 molecules is an intermediate. Addition of one NH3 to PO(OH)3 leads to an energy lowering of the planar form of 31 kcal/mol. This structure is now a transition state. The value for ΔH(300K) for the reaction NH3 + PO(OH)3 → PO(OH)3 · NH3 is 38.6 kcal/mol (MP-2). The complex of PF3O with two NH3 molecules was studied and is an intermediate. The value for ΔH(300K) for the reaction 2NH3 + POF3 → POF3 · (NH3)2 is only 3.3 kcal/mol (MP-2). Electron-donor solvents clearly will stabilize the edge inversion transition state for tetracoordinate main group compounds.

Additional Material: 4 Ill.