Kdo hydroxylase is an inner core assembly enzyme in the Ko-containing lipopolysaccharide biosynthesis.

Journal Article (Journal Article)

The lipopolysaccharide (LPS) isolated from certain important Gram-negative pathogens including a human pathogen Yersinia pestis and opportunistic pathogens Burkholderia mallei and Burkholderia pseudomallei contains d-glycero-d-talo-oct-2-ulosonic acid (Ko), an isosteric analog of 3-deoxy-d-manno-oct-2-ulosonic acid (Kdo). Kdo 3-hydroxylase (KdoO), a Fe(2+)/α-KG/O2 dependent dioxygenase from Burkholderia ambifaria and Yersinia pestis is responsible for Ko formation with Kdo2-lipid A as a substrate, but in which stage KdoO functions during the LPS biosynthesis has not been established. Here we purify KdoO from B. ambifaria (BaKdoO) to homogeneity for the first time and characterize its substrates. BaKdoO utilizes Kdo2-lipid IVA or Kdo2-lipid A as a substrate, but not Kdo-lipid IVAin vivo as well as in vitro and Kdo-(Hep)kdo-lipid A in vitro. These data suggest that KdoO is an inner core assembly enzyme that functions after the Kdo-transferase KdtA but before the heptosyl-transferase WaaC enzyme during the Ko-containing LPS biosynthesis.

Full Text

Duke Authors

Cited Authors

  • Chung, HS; Yang, EG; Hwang, D; Lee, JE; Guan, Z; Raetz, CRH

Published Date

  • September 26, 2014

Published In

Volume / Issue

  • 452 / 3

Start / End Page

  • 789 - 794

PubMed ID

  • 25204504

Pubmed Central ID

  • PMC4282518

Electronic International Standard Serial Number (EISSN)

  • 1090-2104

Digital Object Identifier (DOI)

  • 10.1016/j.bbrc.2014.08.153


  • eng

Conference Location

  • United States