Extensins

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Extensins are a group of structural proteins in the cell wall of plant cells.

properties

Extensins form a network in the plant cell wall and are presumably involved in plant cell growth (synonym cell extension). They consist of a repetitive hydrophilic and a hydrophobic part and are therefore amphiphilic and therefore tend to agglomerate in aqueous solutions. The hydrophilic area has the structural motif Ser - Hyp -Hyp-Hyp-Hyp. The motif is O -glycosylated on the serine and the hydroxyprolines . The glycosylation consists of a short arabinose chain on the hydroxyproline and a galactose on the serine. After the secretion of extensins in the apoplast the network of bonds between the contained tyrosines intra- and intermolecularly cross-linked . About 20 extensins are described in Arabidopsis thaliana . Extensins make up to 20% of the dry matter in the cell wall.

literature

  • PB Kavi Kishor, P. Hima Kumari, MS Sunita, N. Sreenivasulu: Role of proline in cell wall synthesis and plant development and its implications in plant ontogeny. In: Frontiers in plant science. Volume 6, 2015, p. 544, doi : 10.3389 / fpls.2015.00544 , PMID 26257754 , PMC 4507145 (free full text).

Individual evidence

  1. ↑ DT Lamport: Oxygen fixation into hydroxyproline of plant cell wall protein. In: Journal of Biological Chemistry . Volume 238, April 1963, pp. 1438-1440, PMID 13928345 .
  2. ↑ Hanna Rapaport: Ordered Peptide Assemblies at Interfaces. In: Supramolecular Chemistry. 18, 2006, p. 445, doi : 10.1080 / 10610270600665905 .
  3. ↑ E. Nguema-Ona, M. Vicré-Gibouin, M. Gotté, B. Plancot, P. Lerouge, M. Bardor, A. Driouich: Cell wall O-glycoproteins and N-glycoproteins: aspects of biosynthesis and function. In: Frontiers in plant science. Volume 5, 2014, p. 499, doi : 10.3389 / fpls.2014.00499 , PMID 25324850 , PMC 4183102 (free full text).
  4. Jump up ↑ E. Marzol, C. Borassi, M. Bringas, A. Sede, DR Rodríguez Garcia, L. Capece, JM Estevez: Filling the Gaps to Solve the Extensin Puzzle. In: Molecular plant. [electronic publication before printing] March 2018, doi : 10.1016 / j.molp.2018.03.003 , PMID 29530817 .