1MH3

maltose binding-a1 homeodomain protein chimera, crystal form I


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.232 

wwPDB Validation 3D Report Full Report


This is version 1.3 of the entry. See complete history

Literature

Insights into binding cooperativity of MATa1/MATalpha2 from the crystal structure of a MATa1 homeodomain-maltose binding protein chimera

Ke, A.Wolberger, C.

(2003) Protein Sci. 12: 306-312

  • DOI: 10.1110/ps.0219103
  • Primary Citation of Related Structures:  1MH4

  • PubMed Abstract: 
  • The Yeast MATa1 and MATalpha2 are homeodomain proteins that bind DNA cooperatively to repress transcription of cell type specific genes. The DNA affinity and specificity of MATa1 in the absence of MATalpha2, however, is very low. MATa1 is converted t ...

    The Yeast MATa1 and MATalpha2 are homeodomain proteins that bind DNA cooperatively to repress transcription of cell type specific genes. The DNA affinity and specificity of MATa1 in the absence of MATalpha2, however, is very low. MATa1 is converted to a higher affinity DNA-binding protein by its interaction with the C-terminal tail of MATalpha2. To understand why MATa1 binds DNA weakly by itself, and how the MATalpha2 tail affects the affinity of MATa1 for DNA, we determined the crystal structure of a maltose-binding protein (MBP)-a1 chimera whose DNA binding behavior is similar to MATa1. The overall MATa1 conformation in the MBP-a1 structure, which was determined in the absence of alpha2 and DNA, is similar to that in the a1/alpha2/DNA structure. The sole difference is in the C-terminal portion of the DNA recognition helix of MATa1, which is flexible in the present structure. However, these residues are not in a location likely to be affected by binding of the MATalpha2 tail. The results argue against conformational changes in a1 induced by the tail of MATalpha2, suggesting instead that the MATalpha2 tail energetically couples the DNA binding of MATalpha2 and MATa1.


    Organizational Affiliation

    Department of Biophysics and Biophysical Chemistry, Johns Hopkins University School of Medicine, Baltimore, Maryland 21205, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
maltose binding-a1 homeodomain protein chimera
A
421Saccharomyces cerevisiae (strain ATCC 204508 / S288c)Escherichia coli O157:H7
This entity is chimeric
Gene Names: HMRA1, malE
Find proteins for P0CY11 (Saccharomyces cerevisiae (strain ATCC 204508 / S288c))
Go to UniProtKB:  P0CY11
Find proteins for P0AEY0 (Escherichia coli O157:H7)
Go to UniProtKB:  P0AEY0
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2.1 Å
  • R-Value Free: 0.262 
  • R-Value Work: 0.232 
  • Space Group: P 43 21 2
Unit Cell:
Length (Å)Angle (°)
a = 95.485α = 90.00
b = 95.485β = 90.00
c = 155.887γ = 90.00
Software Package:
Software NamePurpose
SCALEPACKdata scaling
AMoREphasing
CNSrefinement
DENZOdata reduction

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

  • Deposited Date: 2002-08-19 
  • Released Date: 2002-09-18 
  • Deposition Author(s): Ke, A., Wolberger, C.

Revision History 

  • Version 1.0: 2002-09-18
    Type: Initial release
  • Version 1.1: 2008-04-28
    Type: Version format compliance
  • Version 1.2: 2011-07-13
    Type: Version format compliance
  • Version 1.3: 2017-08-09
    Type: Refinement description, Source and taxonomy