YceI protein domain

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
| Available protein structures:

Pfam | structures / ECOD
PDB| RCSB PDB; PDBe; PDBj
PDBsum| structure summary

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.

## Structure

Both 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

The 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

1. ↑ "pH-dependent expression of periplasmic proteins and amino acid catabolism in Escherichia coli". J. Bacteriol. 184 (15): 4246–58. August 2002. doi:10.1128/jb.184.15.4246-4258.2002. PMID 12107143.
2. ↑ 2.0 2.1 2.2 "Crystal structure of a novel polyisoprenoid-binding protein from Thermus thermophilus HB8". Protein Sci. 14 (4): 1004–10. April 2005. doi:10.1110/ps.041183305. PMID 15741337.

This article incorporates text from the public domain Pfam and InterPro: IPR007372

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