1jyd

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spinqualitylabelsall models 1jyd, resolution 1.70Å Show:Asymmetric Unit Biological Assembly Drag the structure with the mouse to rotate   Export Animated Image

Crystal Structure of Recombinant Human Serum Retinol-Binding Protein at 1.7 A Resolution

Contents 1 Overview 2 Disease 3 About this Structure 4 Reference

Overview

Serum retinol binding protein (RBP) is a member of the lipocalin family, proteins with up-and-down beta-barrel folds, low levels of sequence, identity, and diverse functions. Although tryptophan 24 of RBP is highly, conserved among lipocalins, it does not play a direct role in activity. To, determine if Trp24 and other conserved residues have roles in stability, and/or folding, we investigated the effects of conservative substitutions, for the four tryptophans and some adjacent residues on the structure, stability, and spectroscopic properties of apo-RBP. Crystal structures of, recombinant human apo-RBP and of a mutant with substitutions for, tryptophans 67 and 91 at 1.7 A and 2.0 A resolution, respectively, as well, as stability measurements, indicate that these relatively exposed, tryptophans have little influence on structure or stability. Although, Trp105 is largely buried in the wall of the beta-barrel, it can be, replaced with minor effects on stability to thermal and chemical, unfolding. In contrast, substitutions of three different amino acids for, Trp24 or replacement of Arg139, a conserved residue that interacts with, Trp24, lead to similar large losses in stability and lower yields of, native protein generated by in vitro folding. The results and the, coordinated nature of natural substitutions at these sites support the, idea that conserved residues in functionally divergent homologs have roles, in stabilizing the native relative to misfolded structures. They also, establish conditions for studies of the kinetics of folding and unfolding, by identifying spectroscopic signals for monitoring the formation of, different substructures.

Disease

Known disease associated with this structure: Retinol binding protein, deficiency of OMIM:[180250]

About this Structure

1JYD is a Single protein structure of sequence from Homo sapiens with GOL as ligand. Full crystallographic information is available from OCA.

Reference

Role of conserved residues in structure and stability: tryptophans of human serum retinol-binding protein, a model for the lipocalin superfamily., Greene LH, Chrysina ED, Irons LI, Papageorgiou AC, Acharya KR, Brew K, Protein Sci. 2001 Nov;10(11):2301-16. PMID:11604536

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