Sökning: onr:"swepub:oai:lup.lub.lu.se:91b3afcf-aa7e-4aea-b16c-637b61687e00" >
Effects of salt con...
Effects of salt concentrations and bending energy on the extent of ejection of phage genomes
-
- Evilevitch, Alex (författare)
- Lund University,Lunds universitet,Biokemi och Strukturbiologi,Centrum för Molekylär Proteinvetenskap,Kemiska institutionen,Institutioner vid LTH,Lunds Tekniska Högskola,Biochemistry and Structural Biology,Center for Molecular Protein Science,Department of Chemistry,Departments at LTH,Faculty of Engineering, LTH
-
Fang, Li Tai (författare)
-
Yoffe, Aron (författare)
-
visa fler...
-
Castelnovo, Martin (författare)
-
Rau, Donald C. (författare)
-
Parsegian, V. Adrian (författare)
-
Gelbart, William M. (författare)
-
Knobler, Charles M. (författare)
-
visa färre...
-
(creator_code:org_t)
- Elsevier BV, 2008
- 2008
- Engelska.
-
Ingår i: Biophysical Journal. - : Elsevier BV. - 1542-0086 .- 0006-3495. ; 94:3, s. 1110-1120
- Relaterad länk:
-
http://dx.doi.org/10...
-
visa fler...
-
http://www.cell.com/...
-
https://lup.lub.lu.s...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Recent work has shown that pressures inside dsDNA phage capsids can be as high as many tens of atmospheres; it is this pressure that is responsible for initiation of the delivery of phage genomes to host cells. The forces driving ejection of the genome have been shown to decrease monotonically as ejection proceeds, and hence to be strongly dependent on the genome length. Here we investigate the effects of ambient salts on the pressures inside phage-l, for the cases of mono-, di-, and tetravalent cations, and measure how the extent of ejection against a fixed osmotic pressure (mimicking the bacterial cytoplasm) varies with cation concentration. We find, for example, that the ejection fraction is halved in 30 mM Mg21 and is decreased by a factor of 10 upon addition of 1 mM spermine. These effects are calculated from a simple model of genome packaging, using DNA-DNA repulsion energies as determined independently from x-ray diffraction measurements on bulk DNA solutions. By comparing the measured ejection fractions with values implied from the bulk DNA solution data, we predict that the bending energy makes the d- spacings inside the capsid larger than those for bulk DNA at the same osmotic pressure.
Ämnesord
- NATURVETENSKAP -- Biologi -- Biofysik (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences -- Biophysics (hsv//eng)
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
Hitta via bibliotek
Till lärosätets databas