7XJD

Crystal structure of bacteriorhodopsin in the ground state by red laser irradiation

PDB DOI: https://doi.org/10.2210/pdb7XJD/pdb

Classification: PROTON TRANSPORT
Organism(s): Halobacterium salinarum NRC-1
Mutation(s): No
Membrane Protein: Yes PDBTMmpstruc

Deposited: 2022-04-16 Released: 2023-03-22
Deposition Author(s): Taguchi, S., Niwa, S., Takeda, K.
Funding Organization(s): Japan Society for the Promotion of Science (JSPS)

Experimental Data Snapshot

Method: X-RAY DIFFRACTION
Resolution: 1.33 Å
R-Value Free: 0.176
R-Value Work: 0.136

wwPDB Validation 3D Report Full Report

Ligand Structure Quality Assessment

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

Literature

Detailed analysis of distorted retinal and its interaction with surrounding residues in the K intermediate of bacteriorhodopsin.

Taguchi, S., Niwa, S., Dao, H.A., Tanaka, Y., Takeda, R., Fukai, S., Hasegawa, K., Takeda, K.

(2023) Commun Biol 6: 190-190

PubMed: 36808185 Search on PubMedSearch on PubMed Central
DOI: https://doi.org/10.1038/s42003-023-04554-2
Primary Citation of Related Structures:
7XJD

PubMed Abstract:
The K intermediate of proton pumping bacteriorhodopsin is the first intermediate generated after isomerization of retinal to the 13-cis form. Although various structures have been reported for the K intermediate until now, these differ from each other, especially in terms of the conformation of the retinal chromophore and its interaction with surrounding residues. We report here an accurate X-ray crystallographic analysis of the K structure. The polyene chain of 13-cis retinal is observed to be S-shaped. The side chain of Lys216, which is covalently bound to retinal via the Schiff-base linkage, interacts with residues, Asp85 and Thr89. In addition, the Nζ-H of the protonated Schiff-base linkage interacts with a residue, Asp212 and a water molecule, W402. Based on quantum chemical calculations for this K structure, we examine the stabilizing factors of distorted conformation of retinal and propose a relaxation manner to the next L intermediate.

Organizational Affiliation

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

Macromolecule Content

Total Structure Weight: 36.14 kDa
Atom Count: 2,313
Modelled Residue Count: 230
Deposited Residue Count: 230
Unique protein chains: 1

Macromolecules

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(by identity cutoff) | 3D Structure

Entity ID: 1
Molecule	Chains	Sequence Length	Organism	Details	Image
Bacteriorhodopsin	A	230	Halobacterium salinarum NRC-1	Mutation(s): 0 Membrane Entity: Yes
UniProt
Find proteins for P02945 (Halobacterium salinarum (strain ATCC 700922 / JCM 11081 / NRC-1)) Explore P02945 Go to UniProtKB: P02945
Entity Groups
Sequence Clusters	30% Identity50% Identity70% Identity90% Identity95% Identity100% Identity
UniProt Group	P02945
Sequence Annotations Expand
Reference Sequence

Small Molecules

Ligands 3 Unique
ID	Chains	Name / Formula / InChI Key	2D Diagram	3D Interactions
L2P Query on L2P Download Ideal Coordinates CCD File SDF format, chain C [auth A] SDF format, chain D [auth A] SDF format, chain G [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 E [auth A] SDF format, chain F [auth A] SDF format, chain I [auth A] MOL2 format, chain C [auth A] MOL2 format, chain D [auth A] MOL2 format, chain G [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 E [auth A] MOL2 format, chain F [auth A] MOL2 format, chain I [auth A]	C [auth A] D [auth A] E [auth A] F [auth A] G [auth A] C [auth A], D [auth A], E [auth A], F [auth A], G [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]	2,3-DI-PHYTANYL-GLYCEROL C₄₃ H₈₈ O₃ ISDBCJSGCHUHFI-UMZPFTBHSA-N		Interactions Focus chain C [auth A] Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A] Focus chain G [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] Interactions & Density Focus chain C [auth A] Focus chain D [auth A] Focus chain E [auth A] Focus chain F [auth A] Focus chain G [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]
SQU Query on SQU Download Ideal Coordinates CCD File SDF format, chain R [auth A] SDF format, chain T [auth A] SDF format, chain H [auth A] SDF format, chain S [auth A] MOL2 format, chain R [auth A] MOL2 format, chain T [auth A] MOL2 format, chain H [auth A] MOL2 format, chain S [auth A]	H [auth A], R [auth A], S [auth A], T [auth A]	2,10,23-TRIMETHYL-TETRACOSANE C₂₇ H₅₆ ZADHKSJXSZBQFB-HHHXNRCGSA-N		Interactions Focus chain H [auth A] Focus chain R [auth A] Focus chain S [auth A] Focus chain T [auth A] Interactions & Density Focus chain H [auth A] Focus chain R [auth A] Focus chain S [auth A] Focus chain T [auth A]
RET (Subject of Investigation/LOI) Query on RET Download Ideal Coordinates CCD File SDF format, chain B [auth A] MOL2 format, chain B [auth A]	B [auth A]	RETINAL C₂₀ H₂₈ O NCYCYZXNIZJOKI-OVSJKPMPSA-N		Interactions Focus chain B [auth A] Interactions & Density Focus chain B [auth A]