6USO

Telomerase Reverse Transcriptase prenucleotide binary complex, TERT:DNA


ChainDomainClassArchitectureTopologyHomology
A1.10.132.70 Mainly Alpha Orthogonal Bundle Topoisomerase I Chain A, domain 4
A3.10.10.20 Alpha Beta Roll HIV Type 1 Reverse Transcriptase Chain A, domain 1
A3.10.10.20 Alpha Beta Roll HIV Type 1 Reverse Transcriptase Chain A, domain 1
A1.10.10.2210 Mainly Alpha Orthogonal Bundle Arc Repressor Mutant, subunit A
A1.10.10.2210 Mainly Alpha Orthogonal Bundle Arc Repressor Mutant, subunit A
A1.10.10.2210 Mainly Alpha Orthogonal Bundle Arc Repressor Mutant, subunit A
A3.30.70.2630 Alpha Beta 2-Layer Sandwich Alpha-Beta Plaits
A3.30.70.2630 Alpha Beta 2-Layer Sandwich Alpha-Beta Plaits
A1.10.357.90 Mainly Alpha Orthogonal Bundle Tetracycline Repressor domain 2

Protein Family Annotation Pfam Database Homepage

ChainsAccessionIdentifierDescriptionCommentsSource
APF00078Reverse transcriptase (RNA-dependent DNA polymerase) (RVT_1)Reverse transcriptase (RNA-dependent DNA polymerase)- Family
APF17984Telomerase reverse transcriptase thumb DNA binding domain (TERT_thumb)Telomerase reverse transcriptase thumb DNA binding domainThe catalytic subunit of telomerase is structurally similar to retroviral reverse transcriptases, viral RNA polymerases and, to a lesser extent, the bacteriophage B-family DNA polymerases. Like its structural homologs, the core catalytic subunit of t ...The catalytic subunit of telomerase is structurally similar to retroviral reverse transcriptases, viral RNA polymerases and, to a lesser extent, the bacteriophage B-family DNA polymerases. Like its structural homologs, the core catalytic subunit of telomerase, TERT, contains the fingers, palm and thumb domains required for nucleic acid and nucleotide associations as well as catalysis. The four major TERT domains: the RNA binding domain (TRBD); the fingers domain, implicated in nucleotide binding and processivity; the palm domain, which contains the active site of the enzyme; and the thumb domain, implicated in DNA binding and processivity are organized into a ring configuration similar to that observed for the substrate-free enzyme. This is the thumb domain found in Tribolium castaneum telomerase catalytic subunit, TERT. Contacts between TERT and the DNA substrate are mostly mediated via backbone interactions with the thumb loop and helix. The thumb helix sits in the minor groove of the RNA-DNA heteroduplex, making extensive contacts with the phosphodiester backbone and the ribose groups of the RNA-DNA hybrid [1, 2].
Domain
APF12009Telomerase ribonucleoprotein complex - RNA binding domain (Telomerase_RBD)Telomerase ribonucleoprotein complex - RNA binding domainTelomeres in most organisms are comprised of tandem simple sequence repeats [1]. The total length of telomeric repeat sequence at each chromosome end is determined in a balance of sequence loss and sequence addition [1]. One major influence on telome ...Telomeres in most organisms are comprised of tandem simple sequence repeats [1]. The total length of telomeric repeat sequence at each chromosome end is determined in a balance of sequence loss and sequence addition [1]. One major influence on telomere length is the enzyme telomerase [1]. It is a reverse transcriptase that adds these simple sequence repeats to chromosome ends by copying a template sequence within the RNA component of the enzyme [1]. The RNA binding domain of telomerase - TRBD - is made up of twelve alpha helices and two short beta sheets [2]. How telomerase and associated regulatory factors physically interact and function with each other to maintain appropriate telomere length is poorly understood. It is known however that TRBD is involved in formation of the holoenzyme (which performs the telomere extension) in addition to recognition and binding of RNA [2].
Domain