2HP1

Inter-subunit signaling in GSAM


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.08 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.201 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

Intersubunit signaling in glutamate-1-semialdehyde-aminomutase.

Stetefeld, J.Jenny, M.Burkhard, P.

(2006) Proc.Natl.Acad.Sci.Usa 103: 13688-13693

  • DOI: 10.1073/pnas.0600306103
  • Primary Citation of Related Structures:  2HOY, 2HOZ, 2HP2

  • PubMed Abstract: 
  • Enzymes are highly dynamic and tightly controlled systems. However, allosteric communication linked to catalytic turnover is poorly understood. We have performed an integrated approach to trap several catalytic intermediates in the alpha2-dimeric key ...

    Enzymes are highly dynamic and tightly controlled systems. However, allosteric communication linked to catalytic turnover is poorly understood. We have performed an integrated approach to trap several catalytic intermediates in the alpha2-dimeric key enzyme of chlorophyll biosynthesis, glutamate-1-semialdehyde aminomutase. Our data reveal an active-site "gating loop," which undergoes a dramatic conformational change during catalysis, that is simultaneously open in one subunit and closed in the other. This loop movement requires a beta-sheet-to-alpha-helix transition to assume the closed conformation, thus facilitating transport of substrate toward, and concomitantly forming, an integral part of the active site. The accompanying intersubunit cross-talk, which controls negative cooperativity between the allosteric pair, was explored at the atomic level. The central elements of the communication triad are the cofactor bound to different catalytic intermediates, the interface helix, and the gating loop. Together, they form a molecular switch in which the cofactor acts as a central signal transmitter linking the subunit interface with the gating loop.


    Organizational Affiliation

    Department of Structural Biology and M. E. Müller Institute for Structural Biology, Biozentrum Universität Basel, Klingelbergstrasse 70, 4056 Basel, Switzerland. joerg.stetefeld@unibas.ch




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
Glutamate-1-semialdehyde 2,1-aminomutase (GSAM) plp-form
A, B
432Synechococcus sp. (strain ATCC 27144 / PCC 6301 / SAUG 1402/1)Gene Names: hemL (gsa)
EC: 5.4.3.8
Find proteins for P24630 (Synechococcus sp. (strain ATCC 27144 / PCC 6301 / SAUG 1402/1))
Go to UniProtKB:  P24630
Small Molecules
Ligands 3 Unique
IDChainsName / Formula / InChI Key2D Diagram3D Interactions
HOZ
Query on HOZ

Download SDF File 
Download CCD File 
B
(4S)-4,5-DIAMINOPENTANOIC ACID
C5 H12 N2 O2
PQGAAJQIFBEYSA-BYPYZUCNSA-N
 Ligand Interaction
EA5
Query on EA5

Download SDF File 
Download CCD File 
A
(4S)-4-AMINO-5-[({3-HYDROXY-2-METHYL-5-[(PHOSPHONOOXY)METHYL]PYRIDIN-4-YL}METHYL)AMINO]PENTANOIC ACID
C13 H22 N3 O7 P
DSCJVPXIMLLBAH-JTQLQIEISA-N
 Ligand Interaction
PLP
Query on PLP

Download SDF File 
Download CCD File 
B
PYRIDOXAL-5'-PHOSPHATE
VITAMIN B6 Phosphate
C8 H10 N O6 P
NGVDGCNFYWLIFO-UHFFFAOYSA-N
 Ligand Interaction
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.08 Å
  • R-Value Free: 0.254 
  • R-Value Work: 0.201 
  • Space Group: P 21 21 21
Unit Cell:
Length (Å)Angle (°)
a = 66.483α = 90.00
b = 106.981β = 90.00
c = 119.499γ = 90.00
Software Package:
Software NamePurpose
CCP4data scaling
CNSrefinement
MOSFLMdata reduction
AMoREphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2006-07-17 
  • Released Date: 2006-08-22 
  • Deposition Author(s): Stetefeld, J.

Revision History 

  • Version 1.0: 2006-08-22
    Type: Initial release
  • Version 1.1: 2008-05-01
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance