3DU1

The 2.0 Angstrom Resolution Crystal Structure of HetL, a Pentapeptide Repeat Protein involved in Heterocyst Differentiation Regulation from the Cyanobacterium Nostoc sp. Strain PCC 7120


Experimental Data Snapshot

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.176 

wwPDB Validation 3D Report Full Report


This is version 1.1 of the entry. See complete history

Literature

The 2A resolution crystal structure of HetL, a pentapeptide repeat protein involved in regulation of heterocyst differentiation in the cyanobacterium Nostoc sp. strain PCC 7120

Ni, S.Sheldrick, G.M.Benning, M.M.Kennedy, M.A.

(2008) J.Struct.Biol. 165: 47-52

  • DOI: 10.1016/j.jsb.2008.09.010

  • PubMed Abstract: 
  • The hetL gene from the cyanobacterium Nostoc sp. PCC 7120 encodes a 237 amino acid protein (25.6kDa) containing 40 predicted tandem pentapeptide repeats. Nostoc sp. PCC 7120 is a filamentous cyanobacterium that forms heterocysts, specialized cells ca ...

    The hetL gene from the cyanobacterium Nostoc sp. PCC 7120 encodes a 237 amino acid protein (25.6kDa) containing 40 predicted tandem pentapeptide repeats. Nostoc sp. PCC 7120 is a filamentous cyanobacterium that forms heterocysts, specialized cells capable of fixing atmospheric N(2) during nitrogen starvation in its aqueous environment. Under these conditions, heterocysts occur in a regular pattern of approximately one out of every 10-15 vegetative cells. Heterocyst differentiation is highly regulated involving hundreds of genes, one of which encodes PatS, thought to be an intercellular peptide signal made by developing heterocysts to inhibit heterocyst differentiation in neighboring vegetative cells, thus contributing to pattern formation and spacing of heterocysts along the filament. While overexpression of PatS suppresses heterocyst differentiation in Nostoc sp. PCC 7120, overexpression of HetL produces a multiple contiguous heterocyst phenotype with loss of the wild type heterocyst pattern, and strains containing extra copies of hetL allow heterocyst formation even in cells overexpressing PatS. Thus, HetL appears to interfere with heterocyst differentiation inhibition by PatS, however, the mechanism for HetL function remains unknown. As a first step towards exploring the mechanism for its biochemical function, the crystal structure of HetL has been solved at 2.0A resolution using sulfur anomalous scattering.


    Organizational Affiliation

    Department of Chemistry and Biochemistry, Miami University, 701 East High Street, Oxford, OH 45056, USA.




Macromolecules

Find similar proteins by: Sequence  |  Structure

Entity ID: 1
MoleculeChainsSequence LengthOrganismDetails
All3740 protein
X
257Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576)Mutation(s): 0 
Find proteins for Q8YQS9 (Nostoc sp. (strain PCC 7120 / SAG 25.82 / UTEX 2576))
Go to UniProtKB:  Q8YQS9
Experimental Data & Validation

Experimental Data

  • Method: X-RAY DIFFRACTION
  • Resolution: 2 Å
  • R-Value Free: 0.204 
  • R-Value Work: 0.176 
  • Space Group: I 2 2 2
Unit Cell:
Length (Å)Angle (°)
a = 68.200α = 90.00
b = 93.763β = 90.00
c = 101.307γ = 90.00
Software Package:
Software NamePurpose
REFMACrefinement
SAINTdata reduction
SADABSdata scaling
PROTEUM PLUSdata collection
SHELXSphasing

Structure Validation

View Full Validation Report or Ramachandran Plots



Entry History 

Deposition Data

Revision History 

  • Version 1.0: 2008-11-11
    Type: Initial release
  • Version 1.1: 2011-07-13
    Type: Source and taxonomy, Version format compliance