ISDA: 3I17

Deposition Date 2009-06-25

Release Date 2009-07-28

Last Version Date 2023-09-06

Entry Detail

PDB ID:

3I17

Keywords:

lipid binding, retinal binding

Title:

Crystal structure of the apo R132K:L121E mutant of cellular retinoic acid-binding protein II at 1.68 angstrom resolution

Biological Source:

Source Organism(s):

Homo sapiens (Taxon ID: 9606)

Expression System(s):

Escherichia coli

Method Details:

Experimental Method:

X-RAY DIFFRACTION

Resolution:

1.68 Å

R-Value Free:

0.23

R-Value Work:

0.18

R-Value Observed:

0.18

Space Group:

P 1

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Macromolecular Entities

Structures with similar UniProt ID

Protein Blast

Polymer Type:polypeptide(L)
Molecule:Cellular retinoic acid-binding protein 2
Gene (Uniprot):CRABP2
Mutagens:R132K, L121E
Chain IDs:A (auth: B), B (auth: A)
Chain Length:137
Number of Molecules:2
Biological Source:Homo sapiens

UniProt ID:P29373 Pfam ID:PF00061

Primary Citation

Elucidating the exact role of engineered CRABPII residues for the formation of a retinal protonated Schiff base.

Vasileiou, C, Wang, W, Jia, X, Lee, K.S, Watson, C.T, Geiger, J.H, Borhan, B.Show

Proteins 77 812 822 (2009)

PMID: 19603486 DOI: 10.1002/prot.22495

Abstact

Cellular Retinoic Acid Binding Protein II (CRABPII) has been reengineered to specifically bind and react with all-trans-retinal to form a protonated Schiff base. Each step of this process has been dissected and four residues (Lys132, Tyr134, Arg111, and Glu121) within the CRABPII binding site have been identified as crucial for imine formation and/or protonation. The precise role of each residue has been examined through site directed mutagenesis and crystallographic studies. The crystal structure of the R132K:L121E-CRABPII (PDB-3I17) double mutant suggests a direct interaction between engineered Glu121 and the native Arg111, which is critical for both Schiff base formation and protonation.

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Primary Citation of related structures

Abstact

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