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Title: Crystal Structure of Cockroach Allergen Bla g 2, an Unusual Zinc Binding Aspartic Protease with a Novel Mode of Self-inhibition

Abstract

The crystal structure of Bla g 2 was solved in order to investigate the structural basis for the allergenic properties of this unusual protein. This is the first structure of an aspartic protease in which conserved glycine residues, in two canonical DTG triads, are substituted by different amino acid residues. Another unprecedented feature revealed by the structure is the single phenylalanine residue insertion on the tip of the flap, with the side-chain occupying the S1 binding pocket. This and other important amino acid substitutions in the active site region of Bla g 2 modify the interactions in the vicinity of the catalytic aspartate residues, increasing the distance between them to {approx}4 {angstrom} and establishing unique direct contacts between the flap and the catalytic residues. We attribute the absence of substantial catalytic activity in Bla g 2 to these unusual features of the active site. Five disulfide bridges and a Zn-binding site confer stability to the protein, which may contribute to sensitization at lower levels of exposure than other allergens.

Authors:
; ; ; ; ;  [1];  [2]
  1. (INDOOR Bio.)
  2. (
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE
OSTI Identifier:
1008660
Resource Type:
Journal Article
Journal Name:
J. Mol. Biol.
Additional Journal Information:
Journal Volume: 348; Journal Issue: (2) ; 2005; Journal ID: ISSN 0022-2836
Country of Publication:
United States
Language:
ENGLISH
Subject:
36 MATERIALS SCIENCE; AMINO ACIDS; CRYSTAL STRUCTURE; DISULFIDES; GLYCINE; PHENYLALANINE; RESIDUES; STABILITY; ZINC

Citation Formats

Gustchina, Alla, Li, Mi, Wunschmann, Sabina, Chapman, Martin D., Pomes, Anna, Wlodawer, Alexander, and NIH). Crystal Structure of Cockroach Allergen Bla g 2, an Unusual Zinc Binding Aspartic Protease with a Novel Mode of Self-inhibition. United States: N. p., 2010. Web. doi:10.1016/j.jmb.2005.02.062.
Gustchina, Alla, Li, Mi, Wunschmann, Sabina, Chapman, Martin D., Pomes, Anna, Wlodawer, Alexander, & NIH). Crystal Structure of Cockroach Allergen Bla g 2, an Unusual Zinc Binding Aspartic Protease with a Novel Mode of Self-inhibition. United States. doi:10.1016/j.jmb.2005.02.062.
Gustchina, Alla, Li, Mi, Wunschmann, Sabina, Chapman, Martin D., Pomes, Anna, Wlodawer, Alexander, and NIH). Mon . "Crystal Structure of Cockroach Allergen Bla g 2, an Unusual Zinc Binding Aspartic Protease with a Novel Mode of Self-inhibition". United States. doi:10.1016/j.jmb.2005.02.062.
@article{osti_1008660,
title = {Crystal Structure of Cockroach Allergen Bla g 2, an Unusual Zinc Binding Aspartic Protease with a Novel Mode of Self-inhibition},
author = {Gustchina, Alla and Li, Mi and Wunschmann, Sabina and Chapman, Martin D. and Pomes, Anna and Wlodawer, Alexander and NIH)},
abstractNote = {The crystal structure of Bla g 2 was solved in order to investigate the structural basis for the allergenic properties of this unusual protein. This is the first structure of an aspartic protease in which conserved glycine residues, in two canonical DTG triads, are substituted by different amino acid residues. Another unprecedented feature revealed by the structure is the single phenylalanine residue insertion on the tip of the flap, with the side-chain occupying the S1 binding pocket. This and other important amino acid substitutions in the active site region of Bla g 2 modify the interactions in the vicinity of the catalytic aspartate residues, increasing the distance between them to {approx}4 {angstrom} and establishing unique direct contacts between the flap and the catalytic residues. We attribute the absence of substantial catalytic activity in Bla g 2 to these unusual features of the active site. Five disulfide bridges and a Zn-binding site confer stability to the protein, which may contribute to sensitization at lower levels of exposure than other allergens.},
doi = {10.1016/j.jmb.2005.02.062},
journal = {J. Mol. Biol.},
issn = {0022-2836},
number = (2) ; 2005,
volume = 348,
place = {United States},
year = {2010},
month = {7}
}