Sedimentation Rate as a Measure of Molecular Weight of DNA
- 31 July 1963
- journal article
- Published by Elsevier BV in Biophysical Journal
- Vol. 3 (4), 309-321
- https://doi.org/10.1016/s0006-3495(63)86823-x
Abstract
Zone centrifugation of mixtures of two labeled DNA's at low concentrations in density gradients of sucrose permits accurate measurement of relative sedimentation rates. The individual rates are constant during the run. Measurements with DNA's from phages T2, T5, and lambda conform to the relation D2/D1 = (M2/M1)0.35, where D and M refer to distances sedimented and molecular weights of the DNA pair. The results show that high molecular weight DNA's sediment artificially fast in the optical centrifuge, owing to a hitherto unknown effect of molecular interactions. The molecular weight of lambda DNA is 31 million, measured either from sedimentation rate or from tests of fragility under shearKeywords
This publication has 5 references indexed in Scilit:
- Local denaturation of DNA by shearing forces and by heatJournal of Molecular Biology, 1963
- Degradation of deoxyribonucleic acid under hydrodynamic shearing forcesJournal of Molecular Biology, 1961
- A relative molecular weight series derived from the nucleic acid of bacteriophage T2Journal of Molecular Biology, 1961
- THE MOLECULAR WEIGHTS OF T2 BACTERIOPHAGE DNA AND ITS FIRST AND SECOND BREAKAGE PRODUCTSProceedings of the National Academy of Sciences of the United States of America, 1961
- THE PROPERTIES OF SONIC FRAGMENTS OF DEOXYRIBOSE NUCLEIC ACIDProceedings of the National Academy of Sciences of the United States of America, 1958