As of late 2007, two structures have been solved for this class of enzymes, with PDB accession codes 1A2O and 1CHD.
Skerker JM, Prasol MS, Perchuk BS, Biondi EG, Laub MT (October 2005). "Two-component signal transduction pathways regulating growth and cell cycle progression in a bacterium: a system-level analysis". PLOS Biol. 3 (10): e334. doi:10.1371/journal.pbio.0030334. PMC 1233412. PMID 16176121. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1233412 ↩
Stock AM, Robinson VL, Goudreau PN (2000). "Two-component signal transduction". Annu. Rev. Biochem. 69: 183–215. doi:10.1146/annurev.biochem.69.1.183. PMID 10966457. /wiki/Doi_(identifier) ↩