Crystal structure of HPr kinase/phosphatase from Mycoplasma pneumoniae.

Published

Journal Article

HPr kinase/phosphatase (HPrK/P) modifies serine 46 of histidine-containing protein (HPr), the phosphorylation state of which is the control point of carbon catabolite repression in low G+C Gram-positive bacteria. To understand the structural mechanism by which HPrK/P carries out its dual, competing activities we determined the structure of full length HPrK/P from Mycoplasma pneumoniae (PD8 ID, 1KNX) to 2.5A resolution. The enzyme forms a homo-hexamer with each subunit containing two domains connected by a short loop. The C-terminal domain contains the well-described P-loop (Walker A box) ATP binding motif and takes a fold similar to phosphoenolpyruvate carboxykinase (PEPCK) from Escherichia coli as recently described in other HPrK/P structures. As expected, the C-terminal domain is very similar to the C-terminal fragment of Lactobacillus casei HPrK/P and the C-terminal domain of Staphylococcus xylosus HPrK/P; the N-terminal domain is very similar to the N-terminal domain of S.xylosus HPrK/P. Unexpectedly, the N-terminal domain resembles UDP-N-acetylmuramoyl-L-alanyl-D-glutamate:meso-diaminopimelate ligase (MurE), yet the function of this domain is unclear. We discuss these observations as well as the structural significance of mutations in the P-loop and HPrK/P family sequence motif.

Full Text

Duke Authors

Cited Authors

  • Allen, GS; Steinhauer, K; Hillen, W; Stülke, J; Brennan, RG

Published Date

  • February 28, 2003

Published In

Volume / Issue

  • 326 / 4

Start / End Page

  • 1203 - 1217

PubMed ID

  • 12589763

Pubmed Central ID

  • 12589763

International Standard Serial Number (ISSN)

  • 0022-2836

Digital Object Identifier (DOI)

  • 10.1016/s0022-2836(02)01378-5

Language

  • eng

Conference Location

  • England