User:Jing Liu/Sandbox 1: Difference between revisions
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=== DnaA function in Prokaryotes=== | === DnaA function in Prokaryotes=== | ||
DnaA is an AAA+ protein in prokaryotes for DNA replication initiation. To ensure correct timing of DNA replication, intracellular DnaA is under multi-level control, including changing expression/degradation level, regulator control and functional activation/inactivation by nucleotide-depedent conformational change. DnaA is a conserved protein in prokaryotes. In ''E. coli'', There are four regions in this protein: | DnaA is an AAA+ protein in prokaryotes for DNA replication initiation. To ensure correct timing of DNA replication, intracellular DnaA is under multi-level control, including changing expression/degradation level, regulator control and functional activation/inactivation by nucleotide-depedent conformational change. DnaA is a conserved protein in prokaryotes. In ''E. coli'', There are four regions in this protein[http://www.ncbi.nlm.nih.gov/pubmed/10572294]: | ||
I: residues 1-85. DnaB loading domain; | I: residues 1-85. DnaB loading domain; | ||
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=== DnaA Monomer Structure === | === DnaA Monomer Structure === | ||
The DnaA monomeric state of | |||
=== Distinct Assembly State of DnaA === | === Distinct Assembly State of DnaA === | ||
=== Reference === | === Reference === | ||
Revision as of 15:52, 13 May 2012
One of the CBI Molecules being studied in the University of Massachusetts Amherst Chemistry-Biology Interface Program at UMass Amherst and on display at the Molecular Playground.
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DnaA function in ProkaryotesDnaA function in Prokaryotes
DnaA is an AAA+ protein in prokaryotes for DNA replication initiation. To ensure correct timing of DNA replication, intracellular DnaA is under multi-level control, including changing expression/degradation level, regulator control and functional activation/inactivation by nucleotide-depedent conformational change. DnaA is a conserved protein in prokaryotes. In E. coli, There are four regions in this protein[1]:
I: residues 1-85. DnaB loading domain; II: residues 86-133. linker region; III: residues 134-372. ATPase domain; IV: residues 373-467. DNA binding domain;
DnaA function is regulated by different nucleotide binding state. In ATP bound state, DnaA can recognize more binding elements on the chromosome(called DnaA box), and initiate replication by unwinding specific region in the DNA and recruit DnaB helicase. However, after the ATP hydrolysis, DnaA-ADP becomes an inactive protein. This activity change was shown to be associated with its oligomeric assembly state.
DnaA Monomer StructureDnaA Monomer Structure
The DnaA monomeric state of