1FR0

SOLUTION STRUCTURE OF THE HISTIDINE-CONTAINING PHOSPHOTRANSFER DOMAIN OF ANAEROBIC SENSOR KINASE ARCB FROM ESCHERICHIA COLI.


Experimental Data Snapshot

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the lowest energy 

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This is version 1.2 of the entry. See complete history


Literature

Solution structure and dynamic character of the histidine-containing phosphotransfer domain of anaerobic sensor kinase ArcB from Escherichia coli.

Ikegami, T.Okada, T.Ohki, I.Hirayama, J.Mizuno, T.Shirakawa, M.

(2001) Biochemistry 40: 375-386

  • DOI: 10.1021/bi001619g
  • Primary Citation of Related Structures:  
    1FR0

  • PubMed Abstract: 
  • An Escherichia coli sensor kinase, ArcB, transfers a phosphoryl group to a partner response regulator in response to anaerobic conditions. Multidimensional NMR techniques were applied to determine the solution structure of the histidine-containing phosphotransfer signaling domain of ArcB (HPt(ArcB)), which has a phosphorylation site, His717 ...

    An Escherichia coli sensor kinase, ArcB, transfers a phosphoryl group to a partner response regulator in response to anaerobic conditions. Multidimensional NMR techniques were applied to determine the solution structure of the histidine-containing phosphotransfer signaling domain of ArcB (HPt(ArcB)), which has a phosphorylation site, His717. The backbone dynamics were also investigated by analyses of the (15)N relaxation data and amide hydrogen exchange rates. Furthermore, the protonation states of the histidine imidazole rings were characterized by means of (1)H and (15)N chemical shifts at various pHs. The determined solution structure of HPt(ArcB) contains five helices and forms a four-helix bundle motif like other HPt domains. The obtained order parameters, S (2), [(1)H]-(15)N heteronuclear NOE values, and chemical exchange parameters, R(ex), showed that the alpha-helical regions of HPt(ArcB) are rigid on both picosecond to nanosecond and microsecond to millisecond time scales. On the other hand, helix D, which contains His717, exhibited low protection factors of less than 4000, indicating the presence of fluctuations on a slower time scale in helix D. These results suggest that HPt(ArcB) may undergo a small conformational change in helix D upon phosphorylation. It was also shown that the imidazole ring of His717 has a pK(a) value of 6.76, which is similar to that of a solvent-exposed histidine imidazole ring, and that a pair of deprotonated neutral tautomers are rapidly exchanged with each other. This is consistent with the solution structure of HPt(ArcB), in which the imidazole ring of His717 is exposed to the solvent.


    Organizational Affiliation

    Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5 Takayama, Ikoma, Nara 630-0101, Japan.



Macromolecules
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Entity ID: 1
MoleculeChainsSequence LengthOrganismDetailsImage
ARCBA125Escherichia coliMutation(s): 0 
EC: 2.7.3 (PDB Primary Data), 2.7.13.3 (UniProt)
UniProt
Find proteins for P0AEC3 (Escherichia coli (strain K12))
Explore P0AEC3 
Go to UniProtKB:  P0AEC3
Protein Feature View
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  • Reference Sequence
Experimental Data & Validation

Experimental Data

  • Method: SOLUTION NMR
  • Conformers Calculated: 100 
  • Conformers Submitted: 30 
  • Selection Criteria: structures with the lowest energy 
  • OLDERADO: 1FR0 Olderado

Structure Validation

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Entry History 

Deposition Data

Revision History  (Full details and data files)

  • Version 1.0: 2001-03-14
    Type: Initial release
  • Version 1.1: 2008-04-27
    Changes: Version format compliance
  • Version 1.2: 2011-07-13
    Changes: Version format compliance