Ca(2+)-induced folding of a family I.3 lipase with repetitive Ca(2+) binding motifs at the C-terminus.
In order to understand a role of the Ca(2+) ion on the structure and function of a Ca(2+)-dependent family I.3 lipase from Pseudomonas sp. MIS38, apo-PML, holo-PML, holo-PML*, and the N-terminal domain alone (N-fragment) were prepared and biochemically characterized. Apo-PML and holo-PML represent refolded proteins in the absence and presence of the Ca(2+) ion, respectively. Holo-PML* represents a holo-PML dialyzed against 20 mM Tris-HCl (pH 7.5). The results suggest that the C-terminal domain of PML is almost fully unfolded in the apo-form and its folding is induced by Ca(2+) binding. The folding of this C-terminal domain may be required to make a conformation of the N-terminal catalytic domain functional.
Amada
K
K
Department of Material and Life Science, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, 565-0871, Osaka, Japan.
Kwon
H J
HJ
Haruki
M
M
Morikawa
M
M
Kanaya
S
S
D020816:Amino Acid Motifs; D001665:Binding Sites; D002118:Calcium / Q000378:metabolism*; D002122:Calcium Chloride / Q000494:pharmacology; D020134:Catalytic Domain; D002942:Circular Dichroism; D004305:Dose-Response Relationship, Drug; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000378:metabolism; D006863:Hydrogen-Ion Concentration; D008049:Lipase / Q000737:chemistry*; D010957:Plasmids / Q000378:metabolism; D011485:Protein Binding; D011487:Protein Conformation; D017510:Protein Folding; D017434:Protein Structure, Tertiary; D011549:Pseudomonas / Q000201:enzymology*; D011994:Recombinant Proteins / Q000737:chemistry / Q000378:metabolism; D013050:Spectrometry, Fluorescence; D013997:Time Factors
D011994:Recombinant Proteins; D008049:Lipase; D002122:Calcium Chloride; D002118:Calcium