Vitelline membrane outer layer protein I (VMO-I)

Last updated
VOMI
PDB 1vmo EBI.jpg
crystal structure of vitelline membrane outer layer protein i (vmo-i): a folding motif with homologous greek key structures related by an internal three-fold symmetry
Identifiers
SymbolVOMI
Pfam PF03762
InterPro IPR005515
SCOP2 1vmo / SCOPe / SUPFAM
Available protein structures:
Pfam   structures / ECOD  
PDB RCSB PDB; PDBe; PDBj
PDBsum structure summary

In molecular biology, this entry refers to a protein domain called, the Vitelline membrane outer layer protein I (VMO-I). It is a structure found on the outside of an egg, in the vitelline membrane.

Contents

Function

The major role of the vitelline membrane is to prevent the mixing of the yolk and albumen and also act as an important anti-microbial barrier, as indicated by the high content of lysozyme in the outer layer [1] Vitelline membrane outer layer protein I (VMO-I) binds tightly to ovomucin fibrils, which construct the backbone of the outer layer membrane. VMO-I has considerable activity to synthesize N-acetylchito-oligosaccharide from N-acetylglucosamine hexasaccharides but no hydrolysis activity. VMO-I is composed of 163 aa [2]

Structure

The structure [3] consists of three beta-sheets forming Greek key motifs, which are related by an internal pseudo three-fold symmetry. Furthermore, the structure of VOMI has strong similarity to the structure of the delta-endotoxin, as well as a carbohydrate-binding site in the top region of the common fold. [4] VMO-I revealed a unique structure of the P-prism fold, a new type of multi-sheet assembly.

References

  1. Sricharoen S, Kim JJ, Tunkijjanukij S, Söderhäll I (2005). "Exocytosis and proteomic analysis of the vesicle content of granular hemocytes from a crayfish". Dev Comp Immunol. 29 (12): 1017–31. doi:10.1016/j.dci.2005.03.010. PMID   15975654.
  2. Kido S, Doi Y, Kim F, Morishita E, Narita H, Kanaya S, et al. (1995). "Characterization of vitelline membrane outer layer protein I, VMO-I: amino acid sequence and structural stability". J Biochem. 117 (6): 1183–91. doi:10.1093/oxfordjournals.jbchem.a124842. PMID   7490258.
  3. Shimizu T, Vassylyev DG, Kido S, Doi Y, Morikawa K (March 1994). "Crystal structure of vitelline membrane outer layer protein I (VMO-I): a folding motif with homologous Greek key structures related by an internal three-fold symmetry". EMBO J. 13 (5): 1003–10. doi:10.1002/j.1460-2075.1994.tb06348.x. PMC   394907 . PMID   8131734.
  4. Shimizu T, Morikawa K (January 1996). "The beta-prism: a new folding motif". Trends Biochem. Sci. 21 (1): 3–6. doi:10.1016/s0968-0004(06)80018-6. PMID   8848836.
This article incorporates text from the public domain Pfam and InterPro: IPR005515