The interaction of DNA gyrase with the bacterial toxin CcdB: evidence for the existence of two gyrase-CcdB complexes
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The interaction of DNA gyrase with the bacterial toxin CcdB : evidence for the existence of two gyrase-CcdB complexes. / Kampranis, S C; Howells, A J; Maxwell, A.
In: Journal of Molecular Biology, Vol. 293, No. 3, 29.10.1999, p. 733-44.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - The interaction of DNA gyrase with the bacterial toxin CcdB
T2 - evidence for the existence of two gyrase-CcdB complexes
AU - Kampranis, S C
AU - Howells, A J
AU - Maxwell, A
N1 - Copyright 1999 Academic Press.
PY - 1999/10/29
Y1 - 1999/10/29
N2 - CcdB is a bacterial toxin that targets DNA gyrase. Analysis of the interaction of CcdB with gyrase reveals two distinct complexes. An initial complex (alpha) is formed by direct interaction between GyrA and CcdB; this complex can be detected by affinity column and gel-shift analysis, and has a proteolytic signature which is characterised by a 49 kDa fragment of GyrA. Surface plasmon resonance shows that CcdB binds to the N-terminal domain of GyrA with high affinity. In this mode of binding, CcdB does not affect the ability of gyrase to hydrolyse ATP or promote supercoiling. Incubation of this initial complex with ATP in the presence of GyrB and DNA slowly converts it to a second complex (beta), which has a lower rate of ATP hydrolysis and is unable to catalyse supercoiling. The efficiency of formation of this inactive complex is dependent on the concentrations of ATP and CcdB. We suggest that the conversion between the two complexes proceeds via an intermediate, whose formation is dependent on the rate of ATP hydrolysis.
AB - CcdB is a bacterial toxin that targets DNA gyrase. Analysis of the interaction of CcdB with gyrase reveals two distinct complexes. An initial complex (alpha) is formed by direct interaction between GyrA and CcdB; this complex can be detected by affinity column and gel-shift analysis, and has a proteolytic signature which is characterised by a 49 kDa fragment of GyrA. Surface plasmon resonance shows that CcdB binds to the N-terminal domain of GyrA with high affinity. In this mode of binding, CcdB does not affect the ability of gyrase to hydrolyse ATP or promote supercoiling. Incubation of this initial complex with ATP in the presence of GyrB and DNA slowly converts it to a second complex (beta), which has a lower rate of ATP hydrolysis and is unable to catalyse supercoiling. The efficiency of formation of this inactive complex is dependent on the concentrations of ATP and CcdB. We suggest that the conversion between the two complexes proceeds via an intermediate, whose formation is dependent on the rate of ATP hydrolysis.
KW - Adenosine Triphosphatases
KW - Adenosine Triphosphate
KW - Amino Acid Sequence
KW - Bacterial Proteins
KW - Bacterial Toxins
KW - Binding Sites
KW - Chromatography, Affinity
KW - DNA Topoisomerases, Type II
KW - DNA, Superhelical
KW - Dimerization
KW - Escherichia coli
KW - Hydrolysis
KW - Kinetics
KW - Models, Molecular
KW - Molecular Weight
KW - Mutation
KW - Peptide Fragments
KW - Protein Binding
KW - Protein Conformation
KW - Structure-Activity Relationship
KW - Surface Plasmon Resonance
KW - Topoisomerase II Inhibitors
KW - Trypsin
U2 - 10.1006/jmbi.1999.3182
DO - 10.1006/jmbi.1999.3182
M3 - Journal article
C2 - 10543963
VL - 293
SP - 733
EP - 744
JO - Journal of Molecular Biology
JF - Journal of Molecular Biology
SN - 0022-2836
IS - 3
ER -
ID: 159085481