In molecular biology, Yce-I protein domain is a putative periplasmic protein. This entry represents the lipid-binding protein YceI from Escherichia coli [1] and the polyisoprenoid-binding protein TTHA0802 from Thermus thermophilus.[2] Its role is to help aid the biosynthesis of isoprenoid, an important molecule found in all living organisms.
| YceI | |||||||||
|---|---|---|---|---|---|---|---|---|---|
 Crystal structure of the polyisoprenoid-binding protein, TT1927B, from Thermus thermophilus hb8 | |||||||||
| Identifiers | |||||||||
| Symbol | YceI | ||||||||
| Pfam | PF04264 | ||||||||
| InterPro | IPR007372 | ||||||||
| SCOP2 | 1uf6 / SCOPe / SUPFAM | ||||||||
| OPM superfamily | 101 | ||||||||
| OPM protein | 3hpe | ||||||||
| |||||||||
Structure
editBoth of these proteins share a common domain with an 8-stranded beta-barrel fold. This resembles the lipocalin fold, although no sequence homology exists with lipocalins. In TTHA0802, the protein binds the polyisoprenoid chain within the pore of the barrel via hydrophobic interactions.[2] Sequence homologues of this core structure are present in a wide range of bacteria and archaea.
Function
editThe crystal structures suggests that this family of proteins plays an important role in isoprenoid quinone metabolism or in transport or storage. In both cases, the protein is a homodimer, each monomer being characterized by a lipocalin fold.[2]
References
edit- ^ Stancik LM, Stancik DM, Schmidt B, Barnhart DM, Yoncheva YN, Slonczewski JL (August 2002). "pH-dependent expression of periplasmic proteins and amino acid catabolism in Escherichia coli". J. Bacteriol. 184 (15): 4246–58. doi:10.1128/jb.184.15.4246-4258.2002. PMC 135203. PMID 12107143.
- ^ a b c Handa N, Terada T, Doi-Katayama Y, Hirota H, Tame JR, Park SY, Kuramitsu S, Shirouzu M, Yokoyama S (April 2005). "Crystal structure of a novel polyisoprenoid-binding protein from Thermus thermophilus HB8". Protein Sci. 14 (4): 1004–10. doi:10.1110/ps.041183305. PMC 2253440. PMID 15741337.