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Telomerase is a ribonucleoprotein polymerase that maintains telomere ends by addition of the telomere repeat TTAGGG. The enzyme consists of a protein component with reverse transcriptase activity, encoded by this gene, and an RNA component that serves as a template for the telomere repeat.
TERT has a 'mitten' structure that allows it to wrap around the chromosome to add single-stranded telomere repeats. TERT is a reverse transcriptase, which is a class of enzymes that creates single-stranded DNA using single-stranded RNA as a template. An image illustrating how telomerase elongates telomere ends progressively
Telomerase RNA component, also known as TR, TER or TERC, is an ncRNA found in eukaryotes that is a component of telomerase, the enzyme used to extend telomeres. [ 3 ] [ 4 ] TERC serves as a template for telomere replication ( reverse transcription ) by telomerase.
Telomeres are shortened with every duplication of DNA, and must be lengthened again. He studies telomerase , the enzyme that copies the telomeric sequences and lengthens them. [ 8 ] The active site protein subunits of telomerase comprise a new class of reverse transcriptases , enzymes previously thought to be restricted to viruses and ...
Shelterin (also called telosome) is a protein complex known to protect telomeres in many eukaryotes from DNA repair mechanisms, as well as to regulate telomerase activity. In mammals and other vertebrates, telomeric DNA consists of repeating double-stranded 5'-TTAGGG-3' (G-strand) sequences (2-15 kilobases in humans) along with the 3'-AATCCC-5' (C-strand) complement, ending with a 50-400 ...
TERRA-Telomerase Interaction at Long Telomeres. At cells with long telomeres, TERRA is proposed to act as a negative regulator of telomerase activity. This direct inhibitor function acts through base-pairing of the tandem repeats found throughout TERRA's 3'-end to the complementary RNA template region of telomerase. [6]
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