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PDBsum entry 1klo

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Glycoprotein PDB id
1klo

 

 

 

 

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Contents
Protein chain
162 a.a. *
Waters ×357
* Residue conservation analysis
PDB id:
1klo
Name: Glycoprotein
Title: Crystal structure of three consecutive laminin-type epidermal growth factor-like (le) modules of laminin gamma1 chain harboring the nidogen binding site
Structure: Laminin. Chain: a. Fragment: gamma-1 chain, three consecutive laminin-type epidermal growth factor-like (le) modules
Source: Mus musculus. House mouse. Organism_taxid: 10090
Biol. unit: Tetramer (from PQS)
Resolution:
2.10Å     R-factor:   0.197    
Authors: J.Stetefeld,U.Mayer,R.Timpl,R.Huber
Key ref:
J.Stetefeld et al. (1996). Crystal structure of three consecutive laminin-type epidermal growth factor-like (LE) modules of laminin gamma1 chain harboring the nidogen binding site. J Mol Biol, 257, 644-657. PubMed id: 8648630 DOI: 10.1006/jmbi.1996.0191
Date:
02-Feb-96     Release date:   20-Aug-97    
PROCHECK
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 Headers
 References

Protein chain
Pfam   ArchSchema ?
P02468  (LAMC1_MOUSE) -  Laminin subunit gamma-1 from Mus musculus
Seq:
Struc:
 
Seq:
Struc:
 
Seq:
Struc:
 
Seq:
Struc:
1607 a.a.
162 a.a.
Key:    PfamA domain  Secondary structure  CATH domain

 

 
DOI no: 10.1006/jmbi.1996.0191 J Mol Biol 257:644-657 (1996)
PubMed id: 8648630  
 
 
Crystal structure of three consecutive laminin-type epidermal growth factor-like (LE) modules of laminin gamma1 chain harboring the nidogen binding site.
J.Stetefeld, U.Mayer, R.Timpl, R.Huber.
 
  ABSTRACT  
 
The structure of three consecutive laminin-type EGF-like (LE) modules of mouse laminin gammma1 chain, gamma1III3-5 (positions 738 to 899), has been determined by multiple isomorphous replacement in a crystal of space group p6(4)22 (a=b=74.57 angstroms, c = 185.11 angstroms and gamma = 120 degrees). The crystal structure was refined using restrained crystallographic refinement to an R-factor of 19.72% for 14,983 independent reflections with intensities F(obs)> 0 at 2.1 angstroms resolution, with root mean square deviation of 0.012 angstroms and 1.690 degrees from ideal bond lengths and bond angles, respectively. The final model consisted of 1179 (non-hydrogen) protein atoms within 162 residues and 119 water molecules. The molecule showed a rod-like structure of about 76 angstroms length with individual modules twisted relative to each other by about 70 degrees. Each module has the same disulfide bond connections Cys1-Cys3 (loop a), Cys2-Cys4 (loop b), Cys5-Cys6 (loop c) and Cys7-Cys8 (loop d), the first three being identical to epidermal growth factor (EGF). All three LE modules showed little secondary structure which was mainly restricted to loop d, but they differed in several other details of their structure. The interface contacts between the LE modules are based on hydrogen bonds and hydrophobic interactions between the hydrophobic core of loop d of the preceding module and the first cysteine and an exposed residue in loop b of the following module. Module 4 was previously shown to contribute the major nidogen binding site of laminis and site-directed mutagenesis demonstrated a specific binding role for Asp800, Asn802, Val804 and Tyr819 in loops a and c. The side-chain of these four residues are all located on the surface in a linear array and separated by a distance of 17 angstroms between Tyr819 and Val804. The entire nidogen binding site is stabilized via main-chain hydrogen bonds which are in part derived from the link between loops b and c (residues Leu815 and Lys816). The data demonstrate the unique nature of the LE modules and only a remote similarity to EGF. They also indicate that the crucial residues in the binding loops provide direct contacts with nidogen and explain the synergism between loops a and c which is essential for binding.
 
  Selected figure(s)  
 
Figure 1.
Figure 1. View of the overall topology of the g1III3-5 module, emphasizing the secondary structural elements. b-Strands are drawn as arrows and helical segments as spirals. Sequence positions of disulfide bridges are identified and shown in yellow. Module 3 is in red, module 4 in grey, and module 5 in green. All drawings of the structure were made with the program MOLSCRIPT (Kraulius, 1991).
Figure 6.
Figure 6. Structural comparison of the EGF1 module of factor IXa (top) and LE module g1III4 (bottom) emphasizing the different arrangement and sizes of the disulfide loops a to c and a to d. Disulfide bridges are shown in yellow. C, C terminus; N, N terminus. The data for EGF1 were from Brandstetter et al. (1995).
 
  The above figures are reprinted by permission from Elsevier: J Mol Biol (1996, 257, 644-657) copyright 1996.  
  Figures were selected by an automated process.  

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8981325 J.Engel (1996).
Domain organizations of modular extracellular matrix proteins and their evolution.
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The most recent references are shown first. Citation data come partly from CiteXplore and partly from an automated harvesting procedure. Note that this is likely to be only a partial list as not all journals are covered by either method. However, we are continually building up the citation data so more and more references will be included with time. Where a reference describes a PDB structure, the PDB code is shown on the right.

 

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