ISDA

Deposition Date 2013-08-10

Release Date 2013-10-09

Last Version Date 2024-10-30

Entry Detail

PDB ID:

4M6S

Keywords:

TRANSPORT PROTEIN

Title:

Crystal structure of the R111K:R132Y:Y134F:T54V:R59W:A32W mutant of the Cellular Retinoic Acid Binding Protein Type II in complex with All-Trans Retinal at 2.38 Angstrom Resolution

Biological Source:

Source Organism:

Homo sapiens (Taxon ID: 9606)

Host Organism:

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

2.47 Å

R-Value Free:

0.23

R-Value Work:

0.20

R-Value Observed:

0.20

Space Group:

P 31 2 1

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Macromolecular Entities

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Cellular retinoic acid-binding protein 2
Gene (Uniprot):CRABP2
Mutations:R111K:R132Y:Y134F:T54V:R59W:A32W
Chain IDs:A
Chain Length:137
Number of Molecules:1
Biological Source:Homo sapiens

UniProt ID:P29373 Pfam ID:PF00061

Ligand Molecules

RET

Primary Citation

Rational Design of a Colorimetric pH Sensor from a Soluble Retinoic Acid Chaperone.

Berbasova, T, Nosrati, M, Vasileiou, C, Wang, W, Lee, K.S, Yapici, I, Geiger, J.H, Borhan, B.Show

J.Am.Chem.Soc. 135 16111 16119 (2013)

PMID: 24059243 DOI: 10.1021/ja404900k

Abstact

Reengineering of cellular retinoic acid binding protein II (CRABPII) to be capable of binding retinal as a protonated Schiff base is described. Through rational alterations of the binding pocket, electrostatic perturbations of the embedded retinylidene chromophore that favor delocalization of the iminium charge lead to exquisite control in the regulation of chromophoric absorption properties, spanning the visible spectrum (474-640 nm). The pKa of the retinylidene protonated Schiff base was modulated from 2.4 to 8.1, giving rise to a set of proteins of varying colors and pH sensitivities. These proteins were used to demonstrate a concentration-independent, ratiometric pH sensor.

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Primary Citation of related structures