HMM Summary Page: TIGR03473

Functionhopanoid biosynthesis associated protein HpnK
Gene SymbolhpnK
Trusted Cutoff232.60
Domain Trusted Cutoff232.60
Noise Cutoff190.85
Domain Noise Cutoff190.85
Isology Typehypoth_equivalog
HMM Length283
AuthorSelengut J
Entry DateAug 10 2007 1:03PM
Last ModifiedFeb 14 2011 3:27PM
CommentThe sequences represented by this model are members of the PF04794 "YdjC-like" family of uncharacterized proteins. The member of this clade from Acidithiobacillus ferrooxidans ATCC 23270 (AFE_0976) is found in the same locus as squalene-hopene cyclase (SHC, TIGR01507) and other genes associated with the biosynthesis of hopanoid natural products. Similarly, in Ralstonia eutropha JMP134 (Reut_B4902) this gene is adjacent to HpnAB, IspH and HpnH (TIGR03470), although SHC itself is elsewhere in the genome. Notably, this gene (here named HpnK) and three others form a conserved set (HpnIJKL) which occur in a subset of all genomes containing the SHC enzyme. This relationship was discerned using the method of partial phylogenetic profiling [1]. This group includes Zymomonas mobilis, the organism where the initial hopanoid biosynthesis locus was described consisting of the genes HpnA-E and SHC (HpnF) [2]. Continuing past SHC are found a phosphorylase enzyme (ZMO0873, i.e. HpnG, TIGR03468) and a radical SAM enzyme (ZMO0874), HpnH. Although discontinuous in Z. mobilis, we continue the gene symbol sequence with HpnIJKL.
ReferencesRN [1] RM PMID:16930487 RT Exopolysaccharide-associated protein sorting in environmental organisms: the PEP-CTERM/EpsH system. Application of a novel phylogenetic profiling heuristic. RA Haft DH, Paulsen IT, Ward N, Selengut JD RL BMC Biol. 2006 Aug 24;4:29. RN [2] RM PMID:9714766 RT Cloning of conserved genes from Zymomonas mobilis and Bradyrhizobium japonicum that function in the biosynthesis of hopanoid lipids. RA Perzl M, Reipen IG, Schmitz S, Poralla K, Sahm H, Sprenger GA, Kannenberg EL RL Biochim Biophys Acta. 1998 Jul 31;1393(1):108-18.
Genome PropertyGenProp0761: hopanoid lipid biosynthesis (HMM)