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DNA Replication

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DNA clamp

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A protein that holds DNA polymerase in place during strand extension.

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DNA helicase loader

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A protein that assists helicase to load onto the DNA double helix at the replication fork.

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Replication bubble

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The region formed by two replication forks moving in opposite directions during DNA replication.

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DNA gyrase

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A type of topoisomerase found in bacteria that introduces negative supercoils into DNA.

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Primase

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Synthesizes a short RNA primer to initiate DNA synthesis.

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Nucleotide excision repair

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Repairs bulky lesions in DNA that distort the double helix, like those caused by UV light.

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Replicative DNA polymerases

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The group of DNA polymerases involved in the replication of the cellular genome.

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Topoisomerase

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Relieves the stress on DNA strands caused by unwinding.

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DNA polymerase III

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Main enzyme that adds nucleotides in a 5' to 3' direction to form a new complementary DNA strand.

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DNA polymerase I

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Removes RNA primers and replaces them with DNA nucleotides.

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Base excision repair

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Repairs small, non-helix-distorting base lesions, such as cytosine deamination.

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Replication licensing factors

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Proteins that ensure DNA replication occurs only once per cell cycle by regulating the assembly of the replication machinery.

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PCNA (Proliferating Cell Nuclear Antigen)

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The sliding clamp in eukaryotes that increases the processivity of DNA polymerases.

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Pre-initiation complex

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A complex of proteins that forms at the origin of replication prior to the start of DNA synthesis.

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Sliding clamp loader

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A protein complex that opens the sliding clamp so it can encircle DNA and then loads it onto the DNA.

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Telomerase

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An enzyme that adds repetitive nucleotide sequences to the ends of chromosomes, preventing their shortening during replication.

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Mismatch repair

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A repair system that fixes incorrectly paired nucleotides that escape proofreading by DNA polymerases.

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DNA-dependent DNA polymerase

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Enzyme that synthesizes a new DNA strand using an existing DNA strand as a template.

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Replication fork

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The Y-shaped region of a replicating DNA molecule where new strands are growing.

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DNA ligase I

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Specifically involved in sealing nicks during lagging strand synthesis and long-patch base excision repair.

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Single-strand binding proteins (SSBs)

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Bind to and stabilize single-stranded DNA until it can be used as a template.

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Origin of replication

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The specific sequence where DNA replication is initiated.

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Flap endonuclease (FEN1)

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Cleaves flap structures that can arise during DNA replication and repair.

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Helicase

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Unwinds the DNA double helix to separate the two strands.

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Lagging strand

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New complementary DNA strand synthesized in fragments (Okazaki fragments) opposite to the direction of the replication fork.

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Okazaki fragments

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Short fragments of DNA synthesized on the lagging strand during DNA replication.

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Telomere

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The repetitive nucleotide sequences at the ends of eukaryotic chromosomes, which protect the ends from degradation.

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RNA-dependent DNA polymerase (Reverse transcriptase)

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An enzyme that synthesizes DNA from an RNA template, used by retroviruses.

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Leading strand

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New complementary DNA strand synthesized continuously in the direction of the replication fork.

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Ligase

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Joins Okazaki fragments together to create one continuous DNA strand.

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