Protein: CST complex subunit CTC1 (Alpha-accessory factor of 132 kDa) (AAF-132) (AAF132) (Conserved telomere maintenance component 1) (Q5SUQ9)
Organism: Mus musculus (Mouse)
Function: Component of the CST complex proposed to act as a specialized replication factor promoting DNA replication under conditions of replication stress or natural replication barriers such as the telomere duplex. The CST complex binds single-stranded DNA with high affinity in a sequence-independent manner, while isolated subunits bind DNA with low affinity by themselves. Initially the CST complex has been proposed to protect telomeres from DNA degradation. However, the CST complex has been shown to be involved in several aspects of telomere replication. The CST complex inhibits telomerase and is involved in telomere length homeostasis; it is proposed to bind to newly telomerase-synthesized 3' overhangs and to terminate telomerase action implicating the association with the ACD:POT1 complex thus interfering with its telomerase stimulation activity. The CST complex is also proposed to be involved in fill-in synthesis of the telomeric C-strand probably implicating recruitment and activation of DNA polymerase alpha. The CST complex facilitates recovery from many forms of exogenous DNA damage; seems to be involved in the re-initiation of DNA replication at repaired forks and/or dormant origins. Involved in telomere maintenance. Involved in genome stability (By similarity). May be in involved in telomeric C-strand fill-in during late S/G2 phase.
Subcellular location: Nucleus {ECO:0000269|PubMed:19119139, ECO:0000269|PubMed:19854130}. Chromosome, telomere {ECO:0000269|PubMed:19854130}. Note=A transmembrane region is predicted by sequence analysis tools (ESKW, MEMSAT and Phobius); however, given the telomeric localization of the protein, the relevance of the transmembrane region is unsure in vivo. {ECO:0000305}.
Interaction partners:
- CST complex subunit STN1
- CST complex subunit TEN1
- Protection of telomeres protein 1
- Protection of telomeres protein 1
- TERF1-interacting nuclear factor 2
- Telomeric repeat-binding factor 1
- DNA polymerase alpha catalytic subunit
- DNA primase large subunit
- Regulator of telomere elongation helicase 1
- Telomeric repeat-binding factor 2
Sequence:
MAACRAQPPTSEQAWLEAAQTFIQETLCPAGKEVDKELTRSVIACVKETWLSQGENQDLTLPFSYSFVSVQSLKTHQRLPCCSHLSWSQSAYQAWTRGGRPGDGVLPREQLILLGTLVDLLGDSEQECRSGSLYVRDNTGTLDCELIDLDLSWLGHLFLFPSWSYLPSAKRNSLGEGHLELWGTPVPVFPLTVSPGPLIPIPVLYPEKASHLLRYRKKSSIKEINLAGKLVHLSALIITQNKRYFIMTLGELAQAGSQVSIIVQIPAQMVWHRVLRPGRAYVLTKLQVTKTRIHLSCIWTTIPSSTLKPLRPGYVQELELDLEFSKADLKPPPQPTSSKDSRGQEGLVRASKVLHYLGTVTAVLHESAGLYILDGQLILCLAYQKIHGLRRVIRPGVCLELRDVHLLQAVGGATTKPVLALCLHGTVRLQGFSCLKPLTLPSSKVYGASLYEQLVWKCQLGLPLYLWAAKTLEDLIYKLCPHVLRCHQFLKQPSPGKPSLGLQLLAPSWDVLIPPGSPMRHAYSEILEEPHNCPLQKYTPLQTPYSFPTMLALAEEGQHRAWATFDPKAMLPLPEASHLTSCQLNRHLAWSWVCLPSCVFQPAQVLLGVLVASSRKGCLELRDLRGSLPCIPLTESSQPLIDPNLVGCLVRVEKFQLVVEREVRSSFPSWEEMGMARFIQKKQARVYVQFYLADALILPVPRPTFGSEPSQTASSCPEGPHLGQSRLFLLSHKEALMKRNFCLLPGDSSQPAKPTLSFHVSGTWLCGTQRKEGSGWSPPESLAVESKDQKVFLIFLGSSVRWFPFLYPNQVYRLVASGPSQTPVFETEGSAGTSRRPLELADCGSCLTVQEEWTLELGSSQDIPNVLEVPRTLPESSLAQLLGDNSPDSLVSFSAEILSRILCEPPLALRRMKPGNAGAIKTGVKLTVALEMDDCEYPPHLDIYIEDPQLPPQIGLLPGARVHFSQLEKRISRSNIVYCCFRSSTSVQVLSFPPETKASAPLPHIYLAELLQGDRPPFQATTSCHIVYVLSLQILWVCAHCTSICPQGKCSRRDPSCPSQRAVSQANIRLLVEDGTAEATVICRNHLVARALGLSPSEWSSILEHARGPGRVALQFTGLGGQTESASKTHEPLTLLLRTLCTSPFVLRPVKLSFALERRPTDISPREPSRLQQFQCGELPLLTRVNPRLRLVCLSLQEPELPNPPQASAASS