9Q18 | pdb_00009q18

Class II ("T0D0") of Human telomerase catalytic core with shelterin protein TPP1, BIBR1532, dGpNHpp and DNA primer ending in TTAG

PDB DOI: https://doi.org/10.2210/pdb9Q18/pdb
EM Map EMD-72119: EMDB EMDataResource

Classification: RNA BINDING PROTEIN/RNA/DNA
Organism(s): Homo sapiens
Expression System: Homo sapiens, Escherichia coli
Mutation(s): No

Deposited: 2025-08-13 Released: 2026-06-17
Deposition Author(s): Wang, Y., Liu, B., He, Y., Feigon, J.
Funding Organization(s): National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS), National Science Foundation (NSF, United States)

Experimental Data Snapshot

Method: ELECTRON MICROSCOPY
Resolution: 3.30 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

wwPDB Validation 3D Report Full Report

This is version 1.0 of the entry. See complete history.

Literature

Structures of telomerase with BIBR1532 reveal novel mechanism of inhibition

Wang, Y., Liu, B., He, Y., Feigon, J.

To be published.

Macromolecule Content

Total Structure Weight: 327.86 kDa
Atom Count: 14,741
Modeled Residue Count: 1,490
Deposited Residue Count: 2,054
Unique protein chains: 4
Unique nucleic acid chains: 2

Macromolecules

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| 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Telomerase reverse transcriptase	A	1,167	Homo sapiens	Mutation(s): 0 Gene Names: TERT, EST2, TCS1, TRT EC: 2.7.7.49
UniProt & NIH Common Fund Data Resources
Find proteins for O14746 (Homo sapiens) Explore O14746 Go to UniProtKB: O14746
PHAROS: O14746 GTEx: ENSG00000164362
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	O14746
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 3
Molecule	Chains	Sequence Length	Organism	Details	Image
Adrenocortical dysplasia protein homolog	C	163	Homo sapiens	Mutation(s): 0 Gene Names: ACD, PIP1, PTOP, TINT1, TPP1
UniProt & NIH Common Fund Data Resources
Find proteins for Q96AP0 (Homo sapiens) Explore Q96AP0 Go to UniProtKB: Q96AP0
PHAROS: Q96AP0 GTEx: ENSG00000102977
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q96AP0
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 5
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H2A.J	E [auth F]	129	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for Q9BTM1 (Homo sapiens) Explore Q9BTM1 Go to UniProtKB: Q9BTM1
PHAROS: Q9BTM1 GTEx: ENSG00000246705
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	Q9BTM1
Sequence Annotations Expand
Reference Sequence

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| 3D Structure

Entity ID: 6
Molecule	Chains	Sequence Length	Organism	Details	Image
Histone H2B type 1-C/E/F/G/I	F [auth G]	126	Homo sapiens	Mutation(s): 0
UniProt & NIH Common Fund Data Resources
Find proteins for P62807 (Homo sapiens) Explore P62807 Go to UniProtKB: P62807
PHAROS: P62807 GTEx: ENSG00000180596 ENSG00000277224 ENSG00000278588 ENSG00000273802 ENSG00000274290
Entity Groups
Sequence Clusters	30% Identity 50% Identity 70% Identity 90% Identity 95% Identity 100% Identity
UniProt Group	P62807
Sequence Annotations Expand
Reference Sequence

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(by identity cutoff)

Molecule	Chains	Length	Organism
Entity ID: 2
Telomerase RNA	B	451	Homo sapiens
Sequence Annotations Expand
Reference Sequence

Find similar nucleic acids by: Sequence

Molecule	Chains	Length	Organism
Entity ID: 4
Telomeric repeat substrate	D	18	Homo sapiens
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 1 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
55C (Subject of Investigation/LOI) Query on 55C Download:Ideal Coordinates CCD File SDF format, chain G [auth A] MOL2 format, chain G [auth A] mmCIF format, chain G [auth A]	G [auth A]	2-{[(2E)-3-(naphthalen-2-yl)but-2-enoyl]amino}benzoic acid C₂₁ H₁₇ N O₃ PGFQXGLPJUCTOI-WYMLVPIESA-N		Interactions Focus chain G [auth A] Interactions & Density Focus chain G [auth A]

Experimental Data & Validation

Experimental Data

Method: ELECTRON MICROSCOPY
Resolution: 3.30 Å
Aggregation State: PARTICLE
Reconstruction Method: SINGLE PARTICLE

EM Software:

Task	Software Package	Version
RECONSTRUCTION	cryoSPARC

Structure Validation

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View more in-depth experimental data

Entry History

& Funding Information

Deposition Data

Released Date: 2026-06-17

Deposition Author(s):

Funding Organization	Location	Grant Number
National Institutes of Health/National Institute of General Medical Sciences (NIH/NIGMS)	United States	R35GM131901
National Science Foundation (NSF, United States)	United States	MCB2016540