4XF7

myo-inositol 3-kinase bound with its substrates (AMPPCP and myo-inositol)

PDB DOI: https://doi.org/10.2210/pdb4XF7/pdb

Classification: TRANSFERASE
Organism(s): Thermococcus kodakarensis KOD1
Expression System: Escherichia coli
Mutation(s): No

Deposited: 2014-12-26 Released: 2015-06-03
Deposition Author(s): Nagata, R., Fujihashi, M., Miki, K.

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.93 Å
R-Value Free: 0.255
R-Value Work: 0.216
R-Value Observed: 0.218

wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

This is version 1.4 of the entry. See complete history.

Literature

Crystal Structure and Product Analysis of an Archaeal myo-Inositol Kinase Reveal Substrate Recognition Mode and 3-OH Phosphorylation

Nagata, R., Fujihashi, M., Sato, T., Atomi, H., Miki, K.

(2015) Biochemistry 54: 3494-3503

PubMed: 25972008 Search on PubMed
DOI: https://doi.org/10.1021/acs.biochem.5b00296
Primary Citation of Related Structures:
4XF6, 4XF7

PubMed Abstract:
The TK2285 protein from Thermococcus kodakarensis was recently characterized as an enzyme catalyzing the phosphorylation of myo-inositol. Only two myo-inositol kinases have been identified so far, the TK2285 protein and Lpa3 from Zea mays, both of which belong to the ribokinase family. In either case, which of the six hydroxyl groups of myo-inositol is phosphorylated is still unknown. In addition, little is known about the myo-inositol binding mechanism of these enzymes. In this work, we determined two crystal structures: those of the TK2285 protein complexed with the substrates (ATP analogue and myo-inositol) or the reaction products formed by the enzyme. Analysis of the ternary substrates-complex structure and site-directed mutagenesis showed that five residues were involved in the interaction with myo-inositol. Structural comparison with other ribokinase family enzymes indicated that two of the five residues, Q136 and R140, are characteristic of myo-inositol kinase. The crystal structure of the ternary products-complex, which was prepared by incubating the TK2285 protein with myo-inositol and ATP, holds 1d-myo-inositol 3-phosphate (Ins(3)P) in the active site. NMR and HPLC analyses with a chiral column also indicated that the TK2285 reaction product was Ins(3)P. The results obtained here showed that the TK2285 protein specifically catalyzes the phosphorylation of the 3-OH of myo-inositol. We thus designated TK2285 as myo-inositol 3-kinase (MI3K). The precise identification of the reaction product should provide a sound basis to further explore inositol metabolism in Archaea.

Organizational Affiliation

†Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto 606-8502, Japan.

Macromolecule Content

Total Structure Weight: 64.89 kDa
Atom Count: 4,380
Modelled Residue Count: 546
Deposited Residue Count: 546
Unique protein chains: 1

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Carbohydrate/pyrimidine kinase, PfkB family	A, B	273	Thermococcus kodakarensis KOD1	Mutation(s): 0 Gene Names: TK2285 EC: 2.7.1.64
UniProt
Find proteins for Q5JDA3 (Thermococcus kodakarensis (strain ATCC BAA-918 / JCM 12380 / KOD1)) Explore Q5JDA3 Go to UniProtKB: Q5JDA3
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	Q5JDA3
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 4 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
ACP Query on ACP Download Ideal Coordinates CCD File SDF format, chain D [auth A] SDF format, chain S [auth B] MOL2 format, chain D [auth A] MOL2 format, chain S [auth B]	D [auth A], S [auth B]	PHOSPHOMETHYLPHOSPHONIC ACID ADENYLATE ESTER C₁₁ H₁₈ N₅ O₁₂ P₃ UFZTZBNSLXELAL-IOSLPCCCSA-N		Interactions Focus chain D [auth A] Focus chain S [auth B] Interactions & Density Focus chain D [auth A] Focus chain S [auth B]
INS Query on INS Download Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain R [auth B] MOL2 format, chain C [auth A] MOL2 format, chain R [auth B]	C [auth A], R [auth B]	1,2,3,4,5,6-HEXAHYDROXY-CYCLOHEXANE C₆ H₁₂ O₆ CDAISMWEOUEBRE-GPIVLXJGSA-N		Interactions Focus chain C [auth A] Focus chain R [auth B] Interactions & Density Focus chain C [auth A] Focus chain R [auth B]
IOD Query on IOD Download Ideal Coordinates CCD File SDF format, chain AA [auth B] SDF format, chain BA [auth B] SDF format, chain CA [auth B] SDF format, chain DA [auth B] SDF format, chain F [auth A] SDF format, chain G [auth A] SDF format, chain H [auth A] SDF format, chain I [auth A] SDF format, chain J [auth A] SDF format, chain K [auth A] SDF format, chain L [auth A] SDF format, chain M [auth A] SDF format, chain N [auth A] SDF format, chain O [auth A] SDF format, chain P [auth A] SDF format, chain Q [auth A] SDF format, chain U [auth B] SDF format, chain V [auth B] SDF format, chain W [auth B] SDF format, chain X [auth B] SDF format, chain Y [auth B] SDF format, chain Z [auth B] MOL2 format, chain AA [auth B] MOL2 format, chain BA [auth B] MOL2 format, chain CA [auth B] MOL2 format, chain DA [auth B] MOL2 format, chain F [auth A] MOL2 format, chain G [auth A] MOL2 format, chain H [auth A] MOL2 format, chain I [auth A] MOL2 format, chain J [auth A] MOL2 format, chain K [auth A] MOL2 format, chain L [auth A] MOL2 format, chain M [auth A] MOL2 format, chain N [auth A] MOL2 format, chain O [auth A] MOL2 format, chain P [auth A] MOL2 format, chain Q [auth A] MOL2 format, chain U [auth B] MOL2 format, chain V [auth B] MOL2 format, chain W [auth B] MOL2 format, chain X [auth B] MOL2 format, chain Y [auth B] MOL2 format, chain Z [auth B]	AA [auth B] BA [auth B] CA [auth B] DA [auth B] F [auth A] AA [auth B], BA [auth B], CA [auth B], DA [auth B], F [auth A], G [auth A], H [auth A], I [auth A], J [auth A], K [auth A], L [auth A], M [auth A], N [auth A], O [auth A], P [auth A], Q [auth A], U [auth B], V [auth B], W [auth B], X [auth B], Y [auth B], Z [auth B]	IODIDE ION I XMBWDFGMSWQBCA-UHFFFAOYSA-M		Interactions Focus chain AA [auth B] Focus chain BA [auth B] Focus chain CA [auth B] Focus chain DA [auth B] Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth A] Focus chain J [auth A] Focus chain K [auth A] Focus chain L [auth A] Focus chain M [auth A] Focus chain N [auth A] Focus chain O [auth A] Focus chain P [auth A] Focus chain Q [auth A] Focus chain U [auth B] Focus chain V [auth B] Focus chain W [auth B] Focus chain X [auth B] Focus chain Y [auth B] Focus chain Z [auth B] Interactions & Density Focus chain AA [auth B] Focus chain BA [auth B] Focus chain CA [auth B] Focus chain DA [auth B] Focus chain F [auth A] Focus chain G [auth A] Focus chain H [auth A] Focus chain I [auth A] Focus chain J [auth A] Focus chain K [auth A] Focus chain L [auth A] Focus chain M [auth A] Focus chain N [auth A] Focus chain O [auth A] Focus chain P [auth A] Focus chain Q [auth A] Focus chain U [auth B] Focus chain V [auth B] Focus chain W [auth B] Focus chain X [auth B] Focus chain Y [auth B] Focus chain Z [auth B]
MG Query on MG Download Ideal Coordinates CCD File SDF format, chain E [auth A] SDF format, chain T [auth B] MOL2 format, chain E [auth A] MOL2 format, chain T [auth B]	E [auth A], T [auth B]	MAGNESIUM ION Mg JLVVSXFLKOJNIY-UHFFFAOYSA-N		Interactions Focus chain E [auth A] Focus chain T [auth B] Interactions & Density Focus chain E [auth A] Focus chain T [auth B]

Experimental Data & Validation

Experimental Data

Method: X-RAY DIFFRACTION
Resolution: 1.93 Å
R-Value Free: 0.255
R-Value Work: 0.216
R-Value Observed: 0.218
Space Group: P 2₁ 2₁ 2₁

Unit Cell:

Length ( Å )	Angle ( ˚ )
a = 77.134	α = 90
b = 81.176	β = 90
c = 81.109	γ = 90

Software Package:

Software Name	Purpose
REFMAC	refinement
PDB_EXTRACT	data extraction
HKL-2000	data scaling
REFMAC	phasing

Structure Validation

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Ligand Structure Quality Assessment

Entry History

Deposition Data

Released Date: 2015-06-03

Deposition Author(s):

Nagata, R.

Fujihashi, M.

Miki, K.

Revision History (Full details and data files)

Version 1.0: 2015-06-03
Type: Initial release
Version 1.1: 2015-06-10
Changes: Database references
Version 1.2: 2015-06-24
Changes: Database references
Version 1.3: 2018-03-28
Changes: Data collection, Database references, Derived calculations, Experimental preparation, Source and taxonomy
Version 1.4: 2023-11-08
Changes: Data collection, Database references, Derived calculations, Refinement description

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Help and Resources

4XF7

myo-inositol 3-kinase bound with its substrates (AMPPCP and myo-inositol)

Crystal Structure and Product Analysis of an Archaeal myo-Inositol Kinase Reveal Substrate Recognition Mode and 3-OH Phosphorylation

Entity ID: 1

UniProt

Entity Groups

Sequence Annotations

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Experimental Data

Structure Validation

Ligand Structure Quality Assessment

Deposition Data

Revision History (Full details and data files)