DNA polymerase III: Difference between revisions
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DNA polymerase III is one of the main [[Enzymes|enzymes]] involved in [[DNA|DNA]] replication. When the DNA [[ | DNA polymerase III is one of the main [[Enzymes|enzymes]] involved in [[DNA|DNA]] replication. When the DNA [[Double helix|double helix]] unwinds and a replication fork appears, [[DNA polymerase|DNA polymerase]] III duplicates new strands from the 5' to 3' end at a potential rate of 1000 [[Nucleotides|nucleotides]] per second<ref>Alberts B., Johnson A., Lewis J., Raff M., Roberts K., Walter P. (2008), Biochemistry, 5th Edition, New York, Garland Science, p266-269</ref>. Because of the high rate of duplication, DNA polymerase III can make base pairing errors on both duplicated strands. Also, on the [[lagging|lagging strand ]]due to the 5' to 3' duplication some parts of the new strand are missing. These are sections of unjoined DNA are known as [[Okazaki_fragments|Okazaki fragments ]]which can then be ligated by [[Dna_ligase|DNA ligase. ]]<br> | ||
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Revision as of 11:49, 19 November 2015
DNA polymerase III is one of the main enzymes involved in DNA replication. When the DNA double helix unwinds and a replication fork appears, DNA polymerase III duplicates new strands from the 5' to 3' end at a potential rate of 1000 nucleotides per second[1]. Because of the high rate of duplication, DNA polymerase III can make base pairing errors on both duplicated strands. Also, on the lagging strand due to the 5' to 3' duplication some parts of the new strand are missing. These are sections of unjoined DNA are known as Okazaki fragments which can then be ligated by DNA ligase.
References
- ↑ Alberts B., Johnson A., Lewis J., Raff M., Roberts K., Walter P. (2008), Biochemistry, 5th Edition, New York, Garland Science, p266-269