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- PDB-7n4y: The structure of bovine thyroglobulin with iodinated tyrosines -

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Entry
Database: PDB / ID: 7n4y
TitleThe structure of bovine thyroglobulin with iodinated tyrosines
ComponentsThyroglobulin
KeywordsHORMONE / thyroid hormone synthesis
Function / homology
Function and homology information


hormone biosynthetic process / thyroid hormone generation / hormone activity / extracellular space
Similarity search - Function
Thyroglobulin / : / Thyroglobulin type-1 repeat signature. / Thyroglobulin type-1 / Thyroglobulin type-1 superfamily / Thyroglobulin type-1 repeat / Thyroglobulin type-1 domain profile. / Thyroglobulin type I repeats. / Tyrosine-protein kinase ephrin type A/B receptor-like / Tyrosine-protein kinase ephrin type A/B receptor-like ...Thyroglobulin / : / Thyroglobulin type-1 repeat signature. / Thyroglobulin type-1 / Thyroglobulin type-1 superfamily / Thyroglobulin type-1 repeat / Thyroglobulin type-1 domain profile. / Thyroglobulin type I repeats. / Tyrosine-protein kinase ephrin type A/B receptor-like / Tyrosine-protein kinase ephrin type A/B receptor-like / Putative ephrin-receptor like / Carboxylesterase type B, conserved site / Carboxylesterases type-B signature 2. / Carboxylesterase, type B / Carboxylesterase family / Alpha/Beta hydrolase fold
Similarity search - Domain/homology
Biological speciesBos indicus x Bos taurus (hybrid cattle)
MethodELECTRON MICROSCOPY / single particle reconstruction / cryo EM / Resolution: 2.61 Å
AuthorsKim, K. / Clarke, O.B.
Funding support1items
OrganizationGrant numberCountry
Other private
CitationJournal: Acta Crystallogr D Struct Biol / Year: 2021
Title: The structure of natively iodinated bovine thyroglobulin.
Authors: Kookjoo Kim / Mykhailo Kopylov / Daija Bobe / Kotaro Kelley / Edward T Eng / Peter Arvan / Oliver B Clarke /
Abstract: Thyroglobulin is a homodimeric glycoprotein that is essential for the generation of thyroid hormones in vertebrates. Upon secretion into the lumen of follicles in the thyroid gland, tyrosine residues ...Thyroglobulin is a homodimeric glycoprotein that is essential for the generation of thyroid hormones in vertebrates. Upon secretion into the lumen of follicles in the thyroid gland, tyrosine residues within the protein become iodinated to produce monoiodotyrosine (MIT) and diiodotyrosine (DIT). A subset of evolutionarily conserved pairs of DIT (and MIT) residues can then engage in oxidative coupling reactions that yield either thyroxine (T; produced from coupling of a DIT `acceptor' with a DIT `donor') or triiodothyronine (T; produced from coupling of a DIT acceptor with an MIT donor). Although multiple iodotyrosine residues have been identified as potential donors and acceptors, the specificity and structural context of the pairings (i.e. which donor is paired with which acceptor) have remained unclear. Here, single-particle cryogenic electron microscopy (cryoEM) was used to generate a high-resolution reconstruction of bovine thyroglobulin (2.3 Å resolution in the core region and 2.6 Å overall), allowing the structural characterization of two post-reaction acceptor-donor pairs as well as tyrosine residues modified as MIT and DIT. A substantial spatial separation between donor Tyr149 and acceptor Tyr24 was observed, suggesting that for thyroxine synthesis significant peptide motion is required for coupling at the evolutionarily conserved thyroglobulin amino-terminus.
History
DepositionJun 4, 2021Deposition site: RCSB / Processing site: RCSB
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Structure visualization

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Structure viewerMolecule:
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Assembly

Deposited unit
A: Thyroglobulin
B: Thyroglobulin
hetero molecules


Theoretical massNumber of molelcules
Total (without water)612,40020
Polymers606,1762
Non-polymers6,22418
Water5,549308
1


  • Idetical with deposited unit
  • defined by author
  • Evidence: gel filtration
TypeNameSymmetry operationNumber
identity operation1_5551

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Components

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Protein / Non-polymers , 2 types, 310 molecules AB

#1: Protein Thyroglobulin


Mass: 303087.844 Da / Num. of mol.: 2 / Source method: isolated from a natural source / Source: (natural) Bos indicus x Bos taurus (hybrid cattle) / References: UniProt: A0A4W2CHS8
#6: Water ChemComp-HOH / water


Mass: 18.015 Da / Num. of mol.: 308 / Source method: isolated from a natural source / Formula: H2O

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Sugars , 4 types, 18 molecules

#2: Polysaccharide beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta- ...beta-D-mannopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 586.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DManpb1-4DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1122h-1b_1-5]/1-1-2/a4-b1_b4-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{[(4+1)][b-D-Manp]{}}}LINUCSPDB-CARE
#3: Polysaccharide
2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 424.401 Da / Num. of mol.: 4
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/1,2,1/[a2122h-1b_1-5_2*NCC/3=O]/1-1/a4-b1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}}LINUCSPDB-CARE
#4: Polysaccharide 2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta- ...2-acetamido-2-deoxy-beta-D-glucopyranose-(1-4)-[alpha-L-fucopyranose-(1-6)]2-acetamido-2-deoxy-beta-D-glucopyranose


Type: oligosaccharide / Mass: 570.542 Da / Num. of mol.: 2
Source method: isolated from a genetically manipulated source
DescriptorTypeProgram
DGlcpNAcb1-4[LFucpa1-6]DGlcpNAcb1-ROHGlycam Condensed SequenceGMML 1.0
WURCS=2.0/2,3,2/[a2122h-1b_1-5_2*NCC/3=O][a1221m-1a_1-5]/1-1-2/a4-b1_a6-c1WURCSPDB2Glycan 1.1.0
[][D-1-deoxy-GlcpNAc]{[(4+1)][b-D-GlcpNAc]{}[(6+1)][a-L-Fucp]{}}LINUCSPDB-CARE
#5: Sugar
ChemComp-NAG / 2-acetamido-2-deoxy-beta-D-glucopyranose / N-acetyl-beta-D-glucosamine / 2-acetamido-2-deoxy-beta-D-glucose / 2-acetamido-2-deoxy-D-glucose / 2-acetamido-2-deoxy-glucose / N-ACETYL-D-GLUCOSAMINE


Type: D-saccharide, beta linking / Mass: 221.208 Da / Num. of mol.: 10 / Source method: obtained synthetically / Formula: C8H15NO6
IdentifierTypeProgram
DGlcpNAcbCONDENSED IUPAC CARBOHYDRATE SYMBOLGMML 1.0
N-acetyl-b-D-glucopyranosamineCOMMON NAMEGMML 1.0
b-D-GlcpNAcIUPAC CARBOHYDRATE SYMBOLPDB-CARE 1.0
GlcNAcSNFG CARBOHYDRATE SYMBOLGMML 1.0

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Details

Has ligand of interestY
Has protein modificationY

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Experimental details

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Experiment

ExperimentMethod: ELECTRON MICROSCOPY
EM experimentAggregation state: PARTICLE / 3D reconstruction method: single particle reconstruction

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Sample preparation

ComponentName: Bovine thyroglobulin purified from bovine thyroid / Type: COMPLEX / Entity ID: #1 / Source: NATURAL
Molecular weightValue: 0.66 MDa / Experimental value: YES
Source (natural)Organism: Bos indicus x Bos taurus (hybrid cattle)
Buffer solutionpH: 7.4
SpecimenEmbedding applied: NO / Shadowing applied: NO / Staining applied: NO / Vitrification applied: YES
Specimen supportGrid material: GOLD / Grid mesh size: 300 divisions/in. / Grid type: Quantifoil R0.6/1
VitrificationCryogen name: ETHANE

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Electron microscopy imaging

Experimental equipment
Model: Titan Krios / Image courtesy: FEI Company
MicroscopyModel: TFS KRIOS
Electron gunElectron source: FIELD EMISSION GUN / Accelerating voltage: 300 kV / Illumination mode: FLOOD BEAM
Electron lensMode: BRIGHT FIELD
Image recordingElectron dose: 71.32 e/Å2 / Detector mode: COUNTING / Film or detector model: GATAN K2 SUMMIT (4k x 4k)

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Processing

SoftwareName: PHENIX / Version: 1.18.2_3874: / Classification: refinement
EM software
IDNameCategory
4RELIONCTF correction
9PHENIXmodel refinement
10cryoSPARCinitial Euler assignment
11RELIONfinal Euler assignment
CTF correctionType: PHASE FLIPPING AND AMPLITUDE CORRECTION
3D reconstructionResolution: 2.61 Å / Resolution method: FSC 0.143 CUT-OFF / Num. of particles: 554053 / Symmetry type: POINT
Refine LS restraints
Refine-IDTypeDev idealNumber
ELECTRON MICROSCOPYf_bond_d0.00438448
ELECTRON MICROSCOPYf_angle_d0.67752272
ELECTRON MICROSCOPYf_dihedral_angle_d20.6745504
ELECTRON MICROSCOPYf_chiral_restr0.0465786
ELECTRON MICROSCOPYf_plane_restr0.0046892

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