Structural characteristics of the nucleotide-binding site of Escherichia coli primary replicative helicase DnaB protein. Studies with ribose and base-modified fluorescent nucleotide analogs.
Authors:Bujalowski W,Klonowska MM
Journal:Biochemistry
PubMed ID:8161526
Structural characteristics of the base- and ribose-binding regions of the high-affinity noninteracting nucleotide-binding site of Escherichia coli primary replicative helicase DnaB protein have been studied, using the base-modified fluorescent nucleotide analog 1, N6-ethenoadenosine diphosphate (epsilon ADP) and the ribose-modified fluorescent analogs 3'(2')-O-(N-methylantraniloyl)adenosine 5'-diphosphate (MANT-ADP), 3'-O-(N-methylantraniloyl)deoxyadenosine 5'-diphosphate (MANT-dADP), 3'-O-(N-methylantraniloyl)-deoxyadenosine 5'-triphosphate (MANT-dATP), ... More
A mechanistic model for Ncd directionality.
Authors:Foster KA, Mackey AT, Gilbert SP
Journal:J Biol Chem
PubMed ID:11278404
Ncd is a kinesin-related protein that drives movement to the minus-end of microtubules. Pre-steady-state kinetic experiments have been employed to investigate the cooperative interactions between the motor domains of the MC1 dimer and to establish the ATPase mechanism. Our results indicate that the active sites of dimeric Ncd free in ... More
Moving a microtubule may require two heads: a kinetic investigation of monomeric Ncd.
Authors:Mackey AT, Gilbert SP
Journal:Biochemistry
PubMed ID:10684615
'Ncd is a minus-end-directed microtubule motor and a member of the kinesin superfamily. The Ncd dimer contains two motor domains, and cooperative interactions between the heads influence the interactions of each respective motor domain with the microtubule. The approach we have taken to understand the cooperativity between the two motor ... More
Interactions of nucleotide cofactors with the Escherichia coli replication factor DnaC protein.
Authors:Galletto R, Rajendran S, Bujalowski W
Journal:Biochemistry
PubMed ID:11041861
'Quantitative analyses of the interactions of nucleotide cofactors with the Escherichia coli replicative factor DnaC protein have been performed using thermodynamically rigorous fluorescence titration techniques. This approach allowed us to obtain stoichiometries of the formed complexes and interaction parameters, without any assumptions about the relationship between the observed signal and ... More