5MHH image
Entry Detail
PDB ID:
5MHH
Title:
Crystal structure of engineered human lipocalin 2 carrying p-boronophenylalanine at position 36
Biological Source:
Source Organism:
Host Organism:
PDB Version:
Deposition Date:
2016-11-24
Release Date:
2017-10-11
Method Details:
Experimental Method:
Resolution:
2.00 Å
R-Value Free:
0.23
R-Value Work:
0.18
R-Value Observed:
0.18
Space Group:
I 4
Macromolecular Entities
Polymer Type:polypeptide(L)
Description:Neutrophil gelatinase-associated lipocalin
Mutations:L36BFP Y52F K125W K134N
Chain IDs:A
Chain Length:188
Number of Molecules:1
Biological Source:Homo sapiens
Modified Residue
Compound ID Chain ID Parent Comp ID Details 2D Image
7N8 A LEU modified residue
Ligand Molecules
Primary Citation
Rational Design of an Anticalin-Type Sugar-Binding Protein Using a Genetically Encoded Boronate Side Chain.
ACS Synth Biol 6 2241 2247 (2017)
PMID: 28937743 DOI: 10.1021/acssynbio.7b00199

Abstact

The molecular recognition of carbohydrates plays a fundamental role in many biological processes. However, the development of carbohydrate-binding reagents for biomedical research and use poses a challenge due to the generally poor affinity of proteins toward sugars in aqueous solution. Here, we describe the effective molecular recognition of pyranose monosaccharides (in particular, galactose and mannose) by a rationally designed protein receptor based on the human lipocalin scaffold (Anticalin). Complexation relies on reversible covalent cis-diol boronate diester formation with a genetically encoded l-boronophenylalanine (Bpa) residue which was incorporated as a non-natural amino acid at a sterically permissive position in the ligand pocket of the Anticalin, as confirmed by X-ray crystallography. Compared with the metal-ion and/or avidity-dependent oligovalent lectins that prevail in nature, our approach offers a novel and promising route to generate tight sugar-binding reagents both as research reagents and for biomedical applications.

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