1OSI

STRUCTURE OF 3-ISOPROPYLMALATE DEHYDROGENASE


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.149 

wwPDB Validation 3D Report Full Report


This is version 1.2 of the entry. See complete history

Literature

A mutation at the interface between domains causes rearrangement of domains in 3-isopropylmalate dehydrogenase.

Qu, C.Akanuma, S.Moriyama, H.Tanaka, N.Oshima, T.

(1997) Protein Eng. 10: 45-52

  • Primary Citation of Related Structures:  1OSJ

  • PubMed Abstract: 
  • The structure of a thermostable Ala172Leu mutant, designated A172L, of 3-isopropylmalate dehydrogenase from Thermus thermophilus was determined. The crystal belongs to space group P2(1), with cell parameters a = 55.5 A, b = 88.1 A, c = 72.0 A and bet ...

    The structure of a thermostable Ala172Leu mutant, designated A172L, of 3-isopropylmalate dehydrogenase from Thermus thermophilus was determined. The crystal belongs to space group P2(1), with cell parameters a = 55.5 A, b = 88.1 A, c = 72.0 A and beta = 100.9 degrees. There is one dimer in each asymmetric unit. The final R factor is 17.8% with 69 water molecules at 2.35 A resolution. The mutation is located at the interface between domains and the C alpha trace of the mutant structure deviates from that of the native structure by as much as 1.7 A, while the structure of each domain barely changes. The mutant enzyme has a more closed conformation compared with the wild-type enzyme as a result of the replacement of Ala with Leu at residue 172. These structural variations were found independent of the crystal packing, because the structure of wild type was the same in crystals obtained in different precipitants. The hinge regions for the movement of domains are located around the active cleft of the enzyme, an observation that implies that the mobility of domains around the hinge is indispensable for the activity of the enzyme. The larger side chain at the mutated site contributed to the thermostability of the mutant protein by enhancing the local packing of side chains, and also by shifting the backbone of the opposing domain.


    Related Citations: 
    • Purification, Catalytic Properties, and Thermal Stability of Threo-Ds-3-Isopropylmalate Dehydrogenase Coded by Leub Gene from an Extreme Thermophile, Thermus Thermophilus Strain Hb8
      Yamada, T.,Akutsu, N.,Miyazaki, K.,Kakinuma, K.,Yoshida, M.,Oshima, T.
      (1990) J.Biochem.(Tokyo) 108: 449


    Organizational Affiliation

    Department of Life Science, Faculty of Bioscience and Biotechnology, Tokyo Institute of Technology, Yokohama, Japan.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
3-ISOPROPYLMALATE DEHYDROGENASE
A, B, C, D
345Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579)Gene Names: leuB
EC: 1.1.1.85
Find proteins for Q5SIY4 (Thermus thermophilus (strain HB8 / ATCC 27634 / DSM 579))
Go to UniProtKB:  Q5SIY4
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 3 Å
  • R-Value Work: 0.149 
  • Space Group: P 1 21 1
Unit Cell:
Length (Å)Angle (°)
a = 82.500α = 90.00
b = 86.700β = 90.70
c = 112.100γ = 90.00
Software Package:
Software NamePurpose
X-PLORmodel building
X-PLORphasing
PROCESSdata reduction
X-PLORrefinement

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 1997-01-27
    Type: Initial release
  • Version 1.1: 2008-03-24
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Source and taxonomy, Version format compliance