1HQ6

STRUCTURE OF PYRUVOYL-DEPENDENT HISTIDINE DECARBOXYLASE AT PH 8


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.314 
  • R-Value Work: 0.253 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

pH-induced structural changes regulate histidine decarboxylase activity in Lactobacillus 30a.

Schelp, E.Worley, S.Monzingo, A.F.Ernst, S.Robertus, J.D.

(2001) J.Mol.Biol. 306: 727-732

  • DOI: 10.1006/jmbi.2000.4430

  • PubMed Abstract: 
  • Histidine decarboxylase (HDC) from Lactobacillus 30a produces histamine that is essential to counter waste acids, and to optimize cell growth. The HDC trimer is active at low pH and inactive at neutral to alkaline pH. We have solved the X-ray structu ...

    Histidine decarboxylase (HDC) from Lactobacillus 30a produces histamine that is essential to counter waste acids, and to optimize cell growth. The HDC trimer is active at low pH and inactive at neutral to alkaline pH. We have solved the X-ray structure of HDC at pH 8 and revealed the novel mechanism of pH regulation. At high pH helix B is unwound, destroying the substrate binding pocket. At acid pH the helix is stabilized, partly through protonation of Asp198 and Asp53 on either side of the molecular interface, acting as a proton trap. In contrast to hemoglobin regulation, pH has a large effect on the tertiary structure of HDC monomers and relatively little or no effect on quaternary structure.


    Organizational Affiliation

    Institute of Cellular and Molecular Biology, Department of Chemistry and Biochemistry, University of Texas, Austin, TX, 78712, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
HISTIDINE DECARBOXYLASE
A, C
81Lactobacillus sp. (strain 30a)Mutation(s): 0 
Gene Names: hdcA
EC: 4.1.1.22
Find proteins for P00862 (Lactobacillus sp. (strain 30a))
Go to UniProtKB:  P00862
Entity ID: 2
MoleculeChainsSequence LengthOrganismDetails
HISTIDINE DECARBOXYLASE
B, D
229Lactobacillus sp. (strain 30a)Mutation(s): 0 
Gene Names: hdcA
EC: 4.1.1.22
Find proteins for P00862 (Lactobacillus sp. (strain 30a))
Go to UniProtKB:  P00862
Small Molecules
Modified Residues  1 Unique
IDChainsTypeFormula2D DiagramParent
PYR
Query on PYR
B, D
NON-POLYMERC3 H4 O3

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Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.7 Å
  • R-Value Free: 0.314 
  • R-Value Work: 0.253 
  • Space Group: H 3 2
Unit Cell:
Length (Å)Angle (°)
a = 117.431α = 90.00
b = 117.431β = 90.00
c = 241.600γ = 120.00
Software Package:
Software NamePurpose
X-PLORphasing
X-PLORrefinement
DENZOdata reduction
SCALEPACKdata scaling
X-PLORmodel building

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2001-03-21
    Type: Initial release
  • Version 1.1: 2008-04-27
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance