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FORMATION OF MITOCHONDRIA IN NEUROSPORA CRASSA : A Quantitative Radioautographic Study
Cells of a choline-requiring mutant of Neurospora crassa, labeled with radioactive choline, were transferred to unlabeled medium. At various times during their subsequent logarithmic growth, a highly purified mitochondrial fraction was prepared by sucrose density gradient centrifugation, and the dis...
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Formato: | Texto |
Lenguaje: | English |
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The Rockefeller University Press
1963
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Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2106231/ https://www.ncbi.nlm.nih.gov/pubmed/13931478 |
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author | Luck, David J. L. |
author_facet | Luck, David J. L. |
author_sort | Luck, David J. L. |
collection | PubMed |
description | Cells of a choline-requiring mutant of Neurospora crassa, labeled with radioactive choline, were transferred to unlabeled medium. At various times during their subsequent logarithmic growth, a highly purified mitochondrial fraction was prepared by sucrose density gradient centrifugation, and the distribution of label among individual mitochondria was determined by quantitative autoradiography. Preliminary experiments indicated that, under the conditions of this "washout" experiment, choline served as a stable mitochondrial label. Radioautographic analysis showed that, in fully labeled mycelia and for three mass doubling cycles in the unlabeled medium, radioactivity was randomly distributed among all mitochondria; i.e., the distribution of autographic grains among individual mitochondria followed a Poisson distribution. In experiments in which pulse labeling for 10 minutes was used, the label was randomly distributed among all mitochondria. The data suggest that the mitochondrial mass is increased by a continuous process of addition of new lecithin units to the already existing mitochondrial framework. |
format | Text |
id | pubmed-2106231 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1963 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-21062312008-05-01 FORMATION OF MITOCHONDRIA IN NEUROSPORA CRASSA : A Quantitative Radioautographic Study Luck, David J. L. J Cell Biol Article Cells of a choline-requiring mutant of Neurospora crassa, labeled with radioactive choline, were transferred to unlabeled medium. At various times during their subsequent logarithmic growth, a highly purified mitochondrial fraction was prepared by sucrose density gradient centrifugation, and the distribution of label among individual mitochondria was determined by quantitative autoradiography. Preliminary experiments indicated that, under the conditions of this "washout" experiment, choline served as a stable mitochondrial label. Radioautographic analysis showed that, in fully labeled mycelia and for three mass doubling cycles in the unlabeled medium, radioactivity was randomly distributed among all mitochondria; i.e., the distribution of autographic grains among individual mitochondria followed a Poisson distribution. In experiments in which pulse labeling for 10 minutes was used, the label was randomly distributed among all mitochondria. The data suggest that the mitochondrial mass is increased by a continuous process of addition of new lecithin units to the already existing mitochondrial framework. The Rockefeller University Press 1963-03-01 /pmc/articles/PMC2106231/ /pubmed/13931478 Text en Copyright © Copyright, 1963, by The Rockefeller Institute Press This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/). |
spellingShingle | Article Luck, David J. L. FORMATION OF MITOCHONDRIA IN NEUROSPORA CRASSA : A Quantitative Radioautographic Study |
title | FORMATION OF MITOCHONDRIA IN NEUROSPORA CRASSA
: A Quantitative Radioautographic Study |
title_full | FORMATION OF MITOCHONDRIA IN NEUROSPORA CRASSA
: A Quantitative Radioautographic Study |
title_fullStr | FORMATION OF MITOCHONDRIA IN NEUROSPORA CRASSA
: A Quantitative Radioautographic Study |
title_full_unstemmed | FORMATION OF MITOCHONDRIA IN NEUROSPORA CRASSA
: A Quantitative Radioautographic Study |
title_short | FORMATION OF MITOCHONDRIA IN NEUROSPORA CRASSA
: A Quantitative Radioautographic Study |
title_sort | formation of mitochondria in neurospora crassa
: a quantitative radioautographic study |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2106231/ https://www.ncbi.nlm.nih.gov/pubmed/13931478 |
work_keys_str_mv | AT luckdavidjl formationofmitochondriainneurosporacrassaaquantitativeradioautographicstudy |