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Protein

Protection of telomeres protein 1

Gene

POT1

Organism
Homo sapiens (Human)
Status
Reviewed-Annotation score: Annotation score: 5 out of 5-Experimental evidence at protein leveli

Functioni

Component of the telomerase ribonucleoprotein (RNP) complex that is essential for the replication of chromosome termini. Is a component of the double-stranded telomeric DNA-binding TRF1 complex which is involved in the regulation of telomere length by cis-inhibition of telomerase. Also acts as a single-stranded telomeric DNA-binding protein and thus may act as a downstream effector of the TRF1 complex and may transduce information about telomere maintenance and/or length to the telomere terminus. Component of the shelterin complex (telosome) that is involved in the regulation of telomere length and protection. Shelterin associates with arrays of double-stranded TTAGGG repeats added by telomerase and protects chromosome ends; without its protective activity, telomeres are no longer hidden from the DNA damage surveillance and chromosome ends are inappropriately processed by DNA repair pathways. Binds to two or more telomeric single-stranded 5'-TTAGGG-3' repeats (G-strand) and with high specificity to a minimal telomeric single-stranded 5'-TAGGGTTAG-3' sequence. Binds telomeric single-stranded sequences internally or at proximity of a 3'-end. Its activity is TERT dependent but it does not increase TERT activity by itself. In contrast, the ACD-POT1 heterodimer enhances telomere elongation by increasing telomerase processivity.5 Publications

Sites

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sitei243DNA binding1

GO - Molecular functioni

  • 8-hydroxy-2'-deoxyguanosine DNA binding Source: BHF-UCL
  • DEAD/H-box RNA helicase binding Source: BHF-UCL
  • G-rich single-stranded DNA binding Source: BHF-UCL
  • G-rich strand telomeric DNA binding Source: BHF-UCL
  • single-stranded telomeric DNA binding Source: BHF-UCL
  • telomerase inhibitor activity Source: BHF-UCL
  • telomeric D-loop binding Source: BHF-UCL
  • telomeric DNA binding Source: BHF-UCL

GO - Biological processi

  • DNA duplex unwinding Source: BHF-UCL
  • establishment of protein localization to telomere Source: BHF-UCL
  • negative regulation of telomerase activity Source: BHF-UCL
  • negative regulation of telomere maintenance via telomerase Source: BHF-UCL
  • positive regulation of DNA helicase activity Source: BHF-UCL
  • positive regulation of DNA strand elongation Source: BHF-UCL
  • positive regulation of helicase activity Source: BHF-UCL
  • positive regulation of telomerase activity Source: BHF-UCL
  • positive regulation of telomere maintenance via telomerase Source: BHF-UCL
  • regulation of DNA helicase activity Source: BHF-UCL
  • regulation of telomere maintenance via telomerase Source: BHF-UCL
  • telomere assembly Source: BHF-UCL
  • telomere capping Source: BHF-UCL
  • telomere maintenance via telomerase Source: UniProtKB
  • telomeric D-loop disassembly Source: BHF-UCL

Keywordsi

Molecular functionDNA-binding

Enzyme and pathway databases

ReactomeiR-HSA-1221632. Meiotic synapsis.
R-HSA-171306. Packaging Of Telomere Ends.
R-HSA-2559586. DNA Damage/Telomere Stress Induced Senescence.
SIGNORiQ9NUX5.

Names & Taxonomyi

Protein namesi
Recommended name:
Protection of telomeres protein 1
Short name:
hPot1
Alternative name(s):
POT1-like telomere end-binding protein
Gene namesi
Name:POT1
OrganismiHomo sapiens (Human)
Taxonomic identifieri9606 [NCBI]
Taxonomic lineageiEukaryotaMetazoaChordataCraniataVertebrataEuteleostomiMammaliaEutheriaEuarchontogliresPrimatesHaplorrhiniCatarrhiniHominidaeHomo
Proteomesi
  • UP000005640 Componenti: Chromosome 7

Organism-specific databases

HGNCiHGNC:17284. POT1.

Subcellular locationi

  • Nucleus 1 Publication
  • Chromosometelomere 1 Publication

  • Note: Colocalizes with telomeric DNA.

GO - Cellular componenti

  • chromosome, telomeric region Source: UniProtKB
  • nuclear chromosome, telomeric region Source: BHF-UCL
  • nuclear telomere cap complex Source: BHF-UCL
  • nucleoplasm Source: Reactome
  • nucleus Source: HPA
  • shelterin complex Source: BHF-UCL

Keywords - Cellular componenti

Chromosome, Nucleus, Telomere

Pathology & Biotechi

Involvement in diseasei

Melanoma, cutaneous malignant 10 (CMM10)2 Publications
Disease susceptibility is associated with variations affecting the gene represented in this entry.
Disease descriptionA malignant neoplasm of melanocytes, arising de novo or from a pre-existing benign nevus, which occurs most often in the skin but also may involve other sites.
See also OMIM:615848
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Natural variantiVAR_07139089Y → C in CMM10; complete abolition of POT1-DNA complex formation, thus disrupting the interaction with telomeres and leading to elongated telomeres. 1 PublicationCorresponds to variant dbSNP:rs587777472Ensembl.1
Natural variantiVAR_07139194Q → E in CMM10; complete abolition of POT1-DNA complex formation, thus disrupting the interaction with telomeres and leading to elongated telomeres. 1 PublicationCorresponds to variant dbSNP:rs587777474Ensembl.1
Natural variantiVAR_071392137R → H in CMM10; increased telomere intensity signals and telomere fragility. 1 PublicationCorresponds to variant dbSNP:rs587777475Ensembl.1
Natural variantiVAR_071393224D → N in CMM10. 1 PublicationCorresponds to variant dbSNP:rs202187871Ensembl.1
Natural variantiVAR_071394270S → N in CMM10; significantly increased telomere length and numbers of fragile telomeres. 1 PublicationCorresponds to variant dbSNP:rs587777477Ensembl.1
Natural variantiVAR_071395273R → L in CMM10; complete abolition of POT1-DNA complex formation, thus disrupting the interaction with telomeres and leading to elongated telomeres. 1 PublicationCorresponds to variant dbSNP:rs587777476Ensembl.1
Natural variantiVAR_071396532A → P in CMM10. 1 Publication1
Natural variantiVAR_071397623Q → H in CMM10; increased telomere intensity signals and telomere fragility. 1 PublicationCorresponds to variant dbSNP:rs587777478Ensembl.1
Glioma 9 (GLM9)1 Publication
Disease susceptibility is associated with variations affecting the gene represented in this entry.
Disease descriptionGliomas are benign or malignant central nervous system neoplasms derived from glial cells. They comprise astrocytomas and glioblastoma multiforme that are derived from astrocytes, oligodendrogliomas derived from oligodendrocytes and ependymomas derived from ependymocytes.
See also OMIM:616568
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Natural variantiVAR_07571795G → C in GLM9. 1 PublicationCorresponds to variant dbSNP:rs797045168Ensembl.1

Keywords - Diseasei

Disease mutation

Organism-specific databases

DisGeNETi25913.
MalaCardsiPOT1.
MIMi615848. phenotype.
616568. phenotype.
OpenTargetsiENSG00000128513.
Orphaneti67038. B-cell chronic lymphocytic leukemia.
618. Familial melanoma.
PharmGKBiPA134934904.

Chemistry databases

ChEMBLiCHEMBL5908.

Polymorphism and mutation databases

BioMutaiPOT1.
DMDMi50401179.

PTM / Processingi

Molecule processing

Feature keyPosition(s)DescriptionActionsGraphical viewLength
ChainiPRO_00001217281 – 634Protection of telomeres protein 1Add BLAST634

Proteomic databases

EPDiQ9NUX5.
MaxQBiQ9NUX5.
PaxDbiQ9NUX5.
PeptideAtlasiQ9NUX5.
PRIDEiQ9NUX5.

PTM databases

iPTMnetiQ9NUX5.
PhosphoSitePlusiQ9NUX5.

Expressioni

Tissue specificityi

Ubiquitous.2 Publications

Gene expression databases

BgeeiENSG00000128513.
CleanExiHS_POT1.
ExpressionAtlasiQ9NUX5. baseline and differential.
GenevisibleiQ9NUX5. HS.

Organism-specific databases

HPAiHPA068538.

Interactioni

Subunit structurei

Homodimer or homooligomer. Component of the shelterin complex (telosome) composed of TERF1, TERF2, TINF2, TERF2IP, ACD and POT1. Binds single-stranded telomeric DNA as a monomer (By similarity). Component of the telomerase holoenzyme complex at least composed of TERT, DKC1, WRAP53/TCAB1, NOP10, NHP2, GAR1, TEP1, EST1A, POT1 and a telomerase RNA template component (TERC). Found in a complex with TERF1, TINF2 and TNKS1. Interacts with TNKS1. Forms heterodimers with ACD. Identified in a complex with ACD and single-stranded telomeric DNA.By similarity7 Publications

Binary interactionsi

Show more details

GO - Molecular functioni

  • DEAD/H-box RNA helicase binding Source: BHF-UCL

Protein-protein interaction databases

BioGridi117417. 213 interactors.
DIPiDIP-29610N.
IntActiQ9NUX5. 177 interactors.
MINTiMINT-1466135.
STRINGi9606.ENSP00000350249.

Chemistry databases

BindingDBiQ9NUX5.

Structurei

Secondary structure

1634
Legend: HelixTurnBeta strandPDB Structure known for this area
Show more details
Feature keyPosition(s)DescriptionActionsGraphical viewLength
Helixi14 – 16Combined sources3
Beta strandi19 – 37Combined sources19
Beta strandi39 – 50Combined sources12
Beta strandi56 – 65Combined sources10
Helixi66 – 68Combined sources3
Beta strandi78 – 89Combined sources12
Beta strandi92 – 106Combined sources15
Helixi127 – 143Combined sources17
Helixi153 – 155Combined sources3
Beta strandi161 – 173Combined sources13
Beta strandi175 – 184Combined sources10
Turni200 – 202Combined sources3
Helixi207 – 213Combined sources7
Helixi214 – 216Combined sources3
Beta strandi217 – 223Combined sources7
Helixi226 – 232Combined sources7
Beta strandi238 – 251Combined sources14
Beta strandi257 – 265Combined sources9
Helixi270 – 272Combined sources3
Beta strandi274 – 278Combined sources5
Helixi283 – 297Combined sources15

3D structure databases

Select the link destinations:
PDBei
RCSB PDBi
PDBji
Links Updated
PDB entryMethodResolution (Å)ChainPositionsPDBsum
1XJVX-ray1.73A6-299[»]
3KJOX-ray1.80A1-299[»]
3KJPX-ray1.80A1-299[»]
5H65X-ray2.10A341-634[»]
5UN7X-ray2.10A330-634[»]
ProteinModelPortaliQ9NUX5.
SMRiQ9NUX5.
ModBaseiSearch...
MobiDBiSearch...

Miscellaneous databases

EvolutionaryTraceiQ9NUX5.

Family & Domainsi

Region

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Regioni33 – 48DNA bindingAdd BLAST16
Regioni270 – 273DNA binding4

Sequence similaritiesi

Belongs to the telombin family.Curated

Phylogenomic databases

eggNOGiKOG4757. Eukaryota.
ENOG410Z1J0. LUCA.
GeneTreeiENSGT00390000018285.
HOGENOMiHOG000015271.
HOVERGENiHBG053641.
InParanoidiQ9NUX5.
KOiK11109.
OMAiDKTSWIP.
OrthoDBiEOG091G01T8.
PhylomeDBiQ9NUX5.
TreeFamiTF328398.

Family and domain databases

InterProiView protein in InterPro
IPR012340. NA-bd_OB-fold.
IPR028389. POT1.
IPR032042. POT1PC.
IPR011564. Telomer_end-bd_POT1/Cdc13.
PANTHERiPTHR14513. PTHR14513. 1 hit.
PfamiView protein in Pfam
PF02765. POT1. 1 hit.
PF16686. POT1PC. 1 hit.
SMARTiView protein in SMART
SM00976. Telo_bind. 1 hit.
SUPFAMiSSF50249. SSF50249. 2 hits.

Sequences (2)i

Sequence statusi: Complete.

This entry describes 2 isoformsi produced by alternative splicing. AlignAdd to basket

Note: A number of isoforms are produced.
Isoform 1 (identifier: Q9NUX5-1) [UniParc]FASTAAdd to basket
Also known as: Variant 1

This isoform has been chosen as the 'canonical' sequence. All positional information in this entry refers to it. This is also the sequence that appears in the downloadable versions of the entry.

« Hide

        10         20         30         40         50
MSLVPATNYI YTPLNQLKGG TIVNVYGVVK FFKPPYLSKG TDYCSVVTIV
60 70 80 90 100
DQTNVKLTCL LFSGNYEALP IIYKNGDIVR FHRLKIQVYK KETQGITSSG
110 120 130 140 150
FASLTFEGTL GAPIIPRTSS KYFNFTTEDH KMVEALRVWA STHMSPSWTL
160 170 180 190 200
LKLCDVQPMQ YFDLTCQLLG KAEVDGASFL LKVWDGTRTP FPSWRVLIQD
210 220 230 240 250
LVLEGDLSHI HRLQNLTIDI LVYDNHVHVA RSLKVGSFLR IYSLHTKLQS
260 270 280 290 300
MNSENQTMLS LEFHLHGGTS YGRGIRVLPE SNSDVDQLKK DLESANLTAN
310 320 330 340 350
QHSDVICQSE PDDSFPSSGS VSLYEVERCQ QLSATILTDH QYLERTPLCA
360 370 380 390 400
ILKQKAPQQY RIRAKLRSYK PRRLFQSVKL HCPKCHLLQE VPHEGDLDII
410 420 430 440 450
FQDGATKTPD VKLQNTSLYD SKIWTTKNQK GRKVAVHFVK NNGILPLSNE
460 470 480 490 500
CLLLIEGGTL SEICKLSNKF NSVIPVRSGH EDLELLDLSA PFLIQGTIHH
510 520 530 540 550
YGCKQCSSLR SIQNLNSLVD KTSWIPSSVA EALGIVPLQY VFVMTFTLDD
560 570 580 590 600
GTGVLEAYLM DSDKFFQIPA SEVLMDDDLQ KSVDMIMDMF CPPGIKIDAY
610 620 630
PWLECFIKSY NVTNGTDNQI CYQIFDTTVA EDVI
Length:634
Mass (Da):71,442
Last modified:October 1, 2000 - v1
Checksum:i123A12CABE708C91
GO
Isoform 2 (identifier: Q9NUX5-2) [UniParc]FASTAAdd to basket
Also known as: Variant 3

The sequence of this isoform differs from the canonical sequence as follows:
     532-538: ALGIVPL → DVNSVLV
     539-634: Missing.

Show »
Length:538
Mass (Da):60,534
Checksum:i7D04F3ECC01D448D
GO

Sequence cautioni

The sequence BAB15404 differs from that shown. Reason: Erroneous initiation. Translation N-terminally extended.Curated

Experimental Info

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Sequence conflicti410D → V in BAA91568 (PubMed:14702039).Curated1
Sequence conflicti412K → Q in BAB15404 (PubMed:14702039).Curated1
Sequence conflicti499H → D in CAB43281 (PubMed:17974005).Curated1

Natural variant

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Natural variantiVAR_07139089Y → C in CMM10; complete abolition of POT1-DNA complex formation, thus disrupting the interaction with telomeres and leading to elongated telomeres. 1 PublicationCorresponds to variant dbSNP:rs587777472Ensembl.1
Natural variantiVAR_07139194Q → E in CMM10; complete abolition of POT1-DNA complex formation, thus disrupting the interaction with telomeres and leading to elongated telomeres. 1 PublicationCorresponds to variant dbSNP:rs587777474Ensembl.1
Natural variantiVAR_07571795G → C in GLM9. 1 PublicationCorresponds to variant dbSNP:rs797045168Ensembl.1
Natural variantiVAR_071392137R → H in CMM10; increased telomere intensity signals and telomere fragility. 1 PublicationCorresponds to variant dbSNP:rs587777475Ensembl.1
Natural variantiVAR_071393224D → N in CMM10. 1 PublicationCorresponds to variant dbSNP:rs202187871Ensembl.1
Natural variantiVAR_071394270S → N in CMM10; significantly increased telomere length and numbers of fragile telomeres. 1 PublicationCorresponds to variant dbSNP:rs587777477Ensembl.1
Natural variantiVAR_071395273R → L in CMM10; complete abolition of POT1-DNA complex formation, thus disrupting the interaction with telomeres and leading to elongated telomeres. 1 PublicationCorresponds to variant dbSNP:rs587777476Ensembl.1
Natural variantiVAR_034393529V → M. Corresponds to variant dbSNP:rs34973253Ensembl.1
Natural variantiVAR_071396532A → P in CMM10. 1 Publication1
Natural variantiVAR_071397623Q → H in CMM10; increased telomere intensity signals and telomere fragility. 1 PublicationCorresponds to variant dbSNP:rs587777478Ensembl.1

Alternative sequence

Feature keyPosition(s)DescriptionActionsGraphical viewLength
Alternative sequenceiVSP_010846532 – 538ALGIVPL → DVNSVLV in isoform 2. Curated7
Alternative sequenceiVSP_010847539 – 634Missing in isoform 2. CuratedAdd BLAST96

Sequence databases

Select the link destinations:
EMBLi
GenBanki
DDBJi
Links Updated
AY823520 mRNA. Translation: AAW22613.1.
AK001230 mRNA. Translation: BAA91568.1.
AK001935 mRNA. Translation: BAA91988.1.
AK022580 mRNA. Translation: BAB14110.1.
AK026234 mRNA. Translation: BAB15404.1. Different initiation.
AC004925 Genomic DNA. Translation: AAD08852.1.
AC096665 Genomic DNA. No translation available.
AC110791 Genomic DNA. No translation available.
CH471070 Genomic DNA. Translation: EAW83616.1.
BC002923 mRNA. Translation: AAH02923.1.
AL050120 mRNA. Translation: CAB43281.1.
CCDSiCCDS5793.1. [Q9NUX5-1]
PIRiT08766.
RefSeqiNP_001036059.1. NM_001042594.1.
NP_056265.2. NM_015450.2. [Q9NUX5-1]
XP_006715980.1. XM_006715917.3. [Q9NUX5-1]
UniGeneiHs.31968.

Genome annotation databases

EnsembliENST00000357628; ENSP00000350249; ENSG00000128513. [Q9NUX5-1]
GeneIDi25913.
KEGGihsa:25913.
UCSCiuc003vlm.4. human. [Q9NUX5-1]

Keywords - Coding sequence diversityi

Alternative splicing, Polymorphism

Similar proteinsi

Entry informationi

Entry nameiPOTE1_HUMAN
AccessioniPrimary (citable) accession number: Q9NUX5
Secondary accession number(s): O95018
, Q5MJ36, Q9H662, Q9NW19, Q9UG95
Entry historyiIntegrated into UniProtKB/Swiss-Prot: July 19, 2004
Last sequence update: October 1, 2000
Last modified: August 30, 2017
This is version 165 of the entry and version 1 of the sequence. See complete history.
Entry statusiReviewed (UniProtKB/Swiss-Prot)
Annotation programChordata Protein Annotation Program
DisclaimerAny medical or genetic information present in this entry is provided for research, educational and informational purposes only. It is not in any way intended to be used as a substitute for professional medical advice, diagnosis, treatment or care.

Miscellaneousi

Keywords - Technical termi

3D-structure, Complete proteome, Reference proteome

Documents

  1. Human chromosome 7
    Human chromosome 7: entries, gene names and cross-references to MIM
  2. Human entries with polymorphisms or disease mutations
    List of human entries with polymorphisms or disease mutations
  3. Human polymorphisms and disease mutations
    Index of human polymorphisms and disease mutations
  4. MIM cross-references
    Online Mendelian Inheritance in Man (MIM) cross-references in UniProtKB/Swiss-Prot
  5. PDB cross-references
    Index of Protein Data Bank (PDB) cross-references
  6. SIMILARITY comments
    Index of protein domains and families