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Amphibian Lens Histones and Their Relation to the Cell Cycle
Histones have been electrophoretically separated from acid extracts of the frog lens for the first time. The five conventional histone fractions, representing four electrophoretic bands (f1; f2b, f3; f2a2; and f2a1), are present in both the epithelial and fiber cells. In addition, a fifth fraction w...
Autores principales: | , |
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Formato: | Texto |
Lenguaje: | English |
Publicado: |
The Rockefeller University Press
1970
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2203019/ https://www.ncbi.nlm.nih.gov/pubmed/4245690 |
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author | Johnson, Alan Rothstein, Howard |
author_facet | Johnson, Alan Rothstein, Howard |
author_sort | Johnson, Alan |
collection | PubMed |
description | Histones have been electrophoretically separated from acid extracts of the frog lens for the first time. The five conventional histone fractions, representing four electrophoretic bands (f1; f2b, f3; f2a2; and f2a1), are present in both the epithelial and fiber cells. In addition, a fifth fraction was isolated from both sources and the evidence suggests that it may be a tissue-specific histone, possibly related to the lysine-rich f2c fraction found previously only in nucleated erythrocytes. The epithelial cells contain a substantially greater amount of histone than the fiber cells. Moreover, the fibers, unlike the epithelium, manifest no net histone synthesis or turnover following lenticular explantation. Microspectrophotometric, radioautographic, and gel electrophoretic studies indicate that the histones are synthesized in frog lenses concurrently with DNA. Inhibition of DNA synthesis does not completely abolish that of histones but reduces it by about one-half. In the early stages of culture (prior to their synthesis and that of DNA) the histones appear to undergo alterations which are prevented by treatment with cycloheximide. |
format | Text |
id | pubmed-2203019 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 1970 |
publisher | The Rockefeller University Press |
record_format | MEDLINE/PubMed |
spelling | pubmed-22030192008-04-23 Amphibian Lens Histones and Their Relation to the Cell Cycle Johnson, Alan Rothstein, Howard J Gen Physiol Article Histones have been electrophoretically separated from acid extracts of the frog lens for the first time. The five conventional histone fractions, representing four electrophoretic bands (f1; f2b, f3; f2a2; and f2a1), are present in both the epithelial and fiber cells. In addition, a fifth fraction was isolated from both sources and the evidence suggests that it may be a tissue-specific histone, possibly related to the lysine-rich f2c fraction found previously only in nucleated erythrocytes. The epithelial cells contain a substantially greater amount of histone than the fiber cells. Moreover, the fibers, unlike the epithelium, manifest no net histone synthesis or turnover following lenticular explantation. Microspectrophotometric, radioautographic, and gel electrophoretic studies indicate that the histones are synthesized in frog lenses concurrently with DNA. Inhibition of DNA synthesis does not completely abolish that of histones but reduces it by about one-half. In the early stages of culture (prior to their synthesis and that of DNA) the histones appear to undergo alterations which are prevented by treatment with cycloheximide. The Rockefeller University Press 1970-05-01 /pmc/articles/PMC2203019/ /pubmed/4245690 Text en Copyright © 1970 by The Rockefeller University 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 Johnson, Alan Rothstein, Howard Amphibian Lens Histones and Their Relation to the Cell Cycle |
title | Amphibian Lens Histones and Their Relation to the Cell Cycle |
title_full | Amphibian Lens Histones and Their Relation to the Cell Cycle |
title_fullStr | Amphibian Lens Histones and Their Relation to the Cell Cycle |
title_full_unstemmed | Amphibian Lens Histones and Their Relation to the Cell Cycle |
title_short | Amphibian Lens Histones and Their Relation to the Cell Cycle |
title_sort | amphibian lens histones and their relation to the cell cycle |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2203019/ https://www.ncbi.nlm.nih.gov/pubmed/4245690 |
work_keys_str_mv | AT johnsonalan amphibianlenshistonesandtheirrelationtothecellcycle AT rothsteinhoward amphibianlenshistonesandtheirrelationtothecellcycle |