Force required to package DNA in capsid

Value 0.12 pN
Organism Bacteriophage Lambda
Reference Garcia HG, Grayson P, Han L, Inamdar M, Kondev J, Nelson PC, Phillips R, Widom J, Wiggins PA. Biological consequences of tightly bent DNA: the other life of a macromolecular celebrity. Biopolymers. 2007 Feb 585(2):115-30.PubMed ID17103419
Method Model of tightly packed viral DNA. Equation (3) on page 118 Force bend=(k*epsilonP)/(2*R^2) where k=flexural rigidity,epsilonP=persistence length,R=radius of bent DNA. Taking R of lambda phage, 29nm
Comments pN=picoNewton=10^-12Newton. This is the force required for initial stage of packaging. It increases as more DNA is wound around 'inversed spool'. This is a relatively small force compared to the maximum forces exerted by molecular motors, which are typically in the pN regime.
Entered by Uri M
ID 103124