- "negative"
number of
superhelical turns, and a left-handed
superhelix is
defined as
having a "positive"
number of
superhelical turns. In the drawing...
-
approximately 146 base
pairs (bp) of DNA
wrapped in 1.67 left-handed
superhelical turns around a
histone octamer,
consisting of 2
copies each of the core...
-
modified by
specialized enzymes called topoisomerases. DNA
supercoil (
superhelical DNA)
Coiled coil Knot
theory Fuller, F.
Brock (1971). "The
writhing number...
-
Fibrous keratin molecules supercoil to form a very stable, left-handed
superhelical motif to multimerise,
forming filaments consisting of
multiple copies...
- of
gyrase (and
topoisomerase IV) to
relax positive supercoils allows superhelical tension ahead of the
polymerase to be
released so that
replication can...
-
structure of the
nucleosome core
particle consisting of H2A , H2B , H3 and H4 core histones, and DNA. The view is from the top
through the
superhelical axis....
- have
ATPase and
helicase activity create negative superhelical tension in the DNA.
Negative superhelical tension causes approximately one turn of DNA to...
-
structure of the
nucleosome core
particle consisting of H2A, H2B, H3 and H4 core histones, and DNA. The view is from the top
through the
superhelical axis....
-
writhe -
number of
turns of the
double stranded DNA
helix around the
superhelical axis L = T + W and ΔL = ΔT + ΔW Any
change of T in a
closed topological...
-
ATPase and
helicase activity create negative superhelical tension in the DNA. This
negative superhelical tension causes approximately one turn of DNA...
