title: Cloning, expression, purification and preliminary X-ray crystallographic studies of Escherichia coli Hsp100 nucleotide-binding domain 2 (NBD2).
abstract: Escherichia coli Hsp100 ClpB has been identified recently as playing critical roles in multi-chaperone systems. ClpB binds and disaggregates denatured polypeptides by employing ATP hydrolysis and allows other molecular chaperones such as Hsp70 DnaK and Hsp40 DnaJ to refold the non-native polypeptides. ClpB contains two nucleotide-binding domains (NBD1 and NBD2) in its primary sequence. Walker A and Walker B motifs exist in both nucleotide-binding domains. Therefore, ClpB belongs to the large ATPase family known as ATPase associated with various cellular activities (AAA). The mechanisms by which NBD1 and NBD2 function to support the ClpB molecular-chaperone activity are currently unknown. To investigate how NBD2 participates in ClpB function to disaggregate denatured proteins, ClpB NBD2 has been cloned and crystallized. The ClpB NBD2 crystals diffract X-rays to 2.5 A using synchrotron X-ray sources. The crystals belong to space group P2(1)2(1)2(1), with unit-cell parameters a = 99.57, b = 149.34, c = 164.69 A.
authors.affiliation: Department of Cell Biology, University of Alabama at Birmingham Center for Biophysical Sciences and Engineering, Birmingham, AL 35294-0005, USA.
authors.forename: Jingzhi
authors.initials: J
authors.lastname: Li
authors.forename: Bingdong
authors.initials: B
authors.lastname: Sha
mesh_terms: D001426:Bacterial Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D003001:Cloning, Molecular; D003460:Crystallization; D018360:Crystallography, X-Ray; D049071:Endopeptidase Clp; D004926:Escherichia coli / Q000737:chemistry*; D015870:Gene Expression; D006360:Heat-Shock Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism; D009711:Nucleotides / Q000378:metabolism; D011487:Protein Conformation; D017434:Protein Structure, Tertiary; D015800:Protozoan Proteins / Q000737:chemistry* / Q000235:genetics / Q000302:isolation & purification / Q000378:metabolism
chemical_list: D001426:Bacterial Proteins; D006360:Heat-Shock Proteins; D009711:Nucleotides; D015800:Protozoan Proteins; D049071:Endopeptidase Clp; C095049:ClpB protein, Leishmania