The Possibility of Branch Conformation in Azotobacter Vinelandii Chromosomal DNA Carrying Multiple Gene Copies and Its Folded State in the Cell Page: 46
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46
sticking among the small sub-unit DNA strands probably due to the
existence of homologous gene segments on the sub-unit DNA strands.
The most significant feature of DNA conformation is seen in
the micrograph of Figure 7. In those micrographs, the postulation of
branch conformation in A. vinelandii chromosomal DNA has a
reliable possibility. The key feature is seen in Figure 7, (a), which
shows a possible, novel configuration, called "replication polygon" in
this study (Figure 7, (b)), observed during the replication process.
This is a three-strand branch point of DNA. How can we interpret
the bridge between the two strands if it is just considered to be a
normal DNA replication fork? It appears almost certain that the
strands are not superimposed on one another. The only way of an
interpretation for the feature was shown in Figure 7, (b) with a
schematic diagram.
There are two interpretations for the electron micrographs
shown in Figure 7, (d) and (e) (see also Figure 7 (c)). First: the con-
figuration of DNA observed can be caused by one DNA strand. It is
assumed that this can be accomplished by self-circling. When the
high magnification of the DNA strands (Figure 7 (e)) is examined,
however, it does not look like a place where two linear strands
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Choi, Munhyeong. The Possibility of Branch Conformation in Azotobacter Vinelandii Chromosomal DNA Carrying Multiple Gene Copies and Its Folded State in the Cell, thesis or dissertation, August 1991; Denton, Texas. (https://digital.library.unt.edu/ark:/67531/metadc798271/m1/52/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; .