Expression of recombinant bovine beta-lactoglobulin in Escherichia coli.
Bovine beta-lactoglobulin A was expressed in Escherichia coli in its mature form. The gene was constructed using a cDNA clone which coded for amino acid residues Leu-11 to Ile-162 and a synthetic oligonucleotide coding for the initial 10 amino acids preceded by a translational start. The met-beta-lactoglobulin was expressed using a tac promoter vector, pTTQ18, and accounted for approximately 15% of the total cellular protein. The recombinant met-beta-lactoglobulin migrated with the same molecular weight as native beta-lactoglobulin A on SDS-PAGE. The majority of the met-beta-lactoglobulin produced was found in an insoluble form but could be solubilized using guanidine-HCl. The renatured preparation was greater than 80% pure and migrated similarly to purified beta-lactoglobulin A under nondenaturing conditions.
Batt
C A
CA
Department of Food Science, Cornell University, Ithaca, New York 14853.
Rabson
L D
LD
Wong
D W
DW
Kinsella
J E
JE
D000595:Amino Acid Sequence; D001483:Base Sequence; D015153:Blotting, Western; D004591:Electrophoresis, Polyacrylamide Gel; D004926:Escherichia coli / Q000378:metabolism*; D007782:Lactoglobulins / Q000096:biosynthesis* / Q000235:genetics / Q000302:isolation & purification; D008969:Molecular Sequence Data; D011994:Recombinant Proteins / Q000096:biosynthesis / Q000235:genetics / Q000302:isolation & purification
D007782:Lactoglobulins; D011994:Recombinant Proteins