3A0R

Crystal structure of histidine kinase ThkA (TM1359) in complex with response regulator protein TrrA (TM1360)

Entity

Entity ID	Chain ID	Description	Type	Chain length	Formula weight	Number of molecules	DB Name (Accession)	Biological source	Descriptive keywords
1	A (A)	Sensor protein	polymer	349	40999.0	1	UniProt (Q9X180) Pfam (PF00989) Pfam (PF00512) Pfam (PF02518)	Thermotoga maritima	Histidine kinase ThkA
2	B (B)	Response regulator	polymer	116	13521.0	1	UniProt (Q9X181) Pfam (PF00072)	Thermotoga maritima	TrrA
3	C (A)	MERCURY (II) ION	non-polymer		200.6	1	Chemie (HG)

Sequence modifications

A: 408 - 755 (UniProt: Q9X180)

PDB	External Database	Details
Met 407	-	expression tag

B: 1 - 116 (UniProt: Q9X181)

PDB	External Database	Details
Mse 89	Leu 89	engineered mutation

Contents of the asymmetric unit

Polymers	Number of chains	2
	Total formula weight	54520.0
Non-Polymers*	Number of molecules	1
	Total formula weight	200.6
All*	Total formula weight	54720.6

*Water molecules are not included.