10.18 Using the information in Figs. 10.14 and 10.18, explain how the two oligonucleotides 5'-CAAAGAAAAG-3' and 5'-CTTTTCTTTG-3' assemble into a double helical structure (see Fig. 10.14 for the 3' and 5' numbering, and definitions of C, A, G and T).

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10.18 Using the information in Figs. 10.14 and
10.18, explain how the two oligonucleotides
5'-CAAAGAAAAG-3' and 5'-CTTTTCTTTG-3'
assemble into a double helical structure (see Fig.
10.14 for the 3' and 5' numbering, and definitions
of C, A, G and T).
Fig. 10.18. Two strands of oligonucleotides sequenced
5-CAAAGAAAAG-3' and 5'-CTTTTCTTTG-3' assemble into a
double helix. The structure has been determined by X-ray diffraction
[M. L. Kopka et al. (1996) J. Mol. Biol., vol. 334, p. 653]. The
backbone of each oligonucleotide is depicted as an arrow pointing
towards the C3' end of the sequence, and the nucleobases are shown in
a 'ladder' representation. The nucleobases are colour coded: G, green;
A, red; C, purple; T, turquoise.
Transcribed Image Text:10.18 Using the information in Figs. 10.14 and 10.18, explain how the two oligonucleotides 5'-CAAAGAAAAG-3' and 5'-CTTTTCTTTG-3' assemble into a double helical structure (see Fig. 10.14 for the 3' and 5' numbering, and definitions of C, A, G and T). Fig. 10.18. Two strands of oligonucleotides sequenced 5-CAAAGAAAAG-3' and 5'-CTTTTCTTTG-3' assemble into a double helix. The structure has been determined by X-ray diffraction [M. L. Kopka et al. (1996) J. Mol. Biol., vol. 334, p. 653]. The backbone of each oligonucleotide is depicted as an arrow pointing towards the C3' end of the sequence, and the nucleobases are shown in a 'ladder' representation. The nucleobases are colour coded: G, green; A, red; C, purple; T, turquoise.
to next sugar
to next sugar
H.
p=0
N-H IIO
Me
5'
N H-N
to next
phosphate
to next
phosphate
Adenine-thymine (A-T) base pair
to next sugar
to next sugar
O.
H
O H-N
= nucleobase
N-H IN
(A, T, G or C)
to next
phosphate
N-H O
to next
H
phosphate
Guanine-cytosine (G-C) base pair
Fig. 10.14. The left-hand diagram shows two units in one strand of DNA; DNA is composed of condensed deoxyribonucleotides and the four
possible nucleobases are adenine (A), guanine (G), cytosine (C) and thymine (T).
The right-hand diagrams illustrate how complementary base pairs in adjacent strands in DNA interact through hydrogen bonding. (See also
Fig. 10.18.)
Transcribed Image Text:to next sugar to next sugar H. p=0 N-H IIO Me 5' N H-N to next phosphate to next phosphate Adenine-thymine (A-T) base pair to next sugar to next sugar O. H O H-N = nucleobase N-H IN (A, T, G or C) to next phosphate N-H O to next H phosphate Guanine-cytosine (G-C) base pair Fig. 10.14. The left-hand diagram shows two units in one strand of DNA; DNA is composed of condensed deoxyribonucleotides and the four possible nucleobases are adenine (A), guanine (G), cytosine (C) and thymine (T). The right-hand diagrams illustrate how complementary base pairs in adjacent strands in DNA interact through hydrogen bonding. (See also Fig. 10.18.)
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