Solution structure of a late embryogenesis abundant protein (LEA14) from Arabidopsis thaliana, a cellular stress-related protein.
We report the three-dimensional structure of a late embryogenesis abundant (LEA) protein from Arabidopsis thaliana gene At1g01470.1. This protein is a member of Pfam cluster PF03168, and has been classified as a LEA14 protein. LEA proteins are expressed under conditions of cellular stress, such as desiccation, cold, osmotic stress, and heat. The structure, which was determined by NMR spectroscopy, revealed that the At1g01470.1 protein has an alphabeta-fold consisting of one alpha-helix and seven beta-strands that form two antiparallel beta-sheets. The closest structural homologs were discovered to be fibronectin Type III domains, which have <7% sequence identity. Because fibronectins from animal cells have been shown to be involved in cell adhesion, cell motility, wound healing, and maintenance of cell shape, it is interesting to note that in plants wounding or stress results in the overexpression of a protein with fibronectin Type III structural features.
Singh
Shanteri
S
Center for Eukaryotic Structural Genomics, University of Wisconsin-Madison, 433 Babcock Drive, Madison, WI 53706, USA.
Cornilescu
Claudia C
CC
Tyler
Robert C
RC
Cornilescu
Gabriel
G
Tonelli
Marco
M
Lee
Min S
MS
Markley
John L
JL
D017360:Arabidopsis / Q000737:chemistry* / Q000378:metabolism; D002448:Cell Adhesion / Q000502:physiology; D002465:Cell Movement / Q000502:physiology; D003080:Cold Temperature; D005353:Fibronectins / Q000737:chemistry / Q000378:metabolism; D006358:Hot Temperature; D019906:Nuclear Magnetic Resonance, Biomolecular / Q000379:methods; D009997:Osmotic Pressure; D010940:Plant Proteins / Q000737:chemistry* / Q000378:metabolism; D017433:Protein Structure, Secondary; D017434:Protein Structure, Tertiary; D040681:Structural Homology, Protein
D005353:Fibronectins; D010940:Plant Proteins; C066246:late embryogenesis abundant protein, plant