Isolation and characterization of recombinant human casein kinase II subunits alpha and beta from bacteria

N Grankowski, B Boldyreff, O G Issinger

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

Resumé

Udgivelsesdato: 1991-May-23
OriginalsprogEngelsk
TidsskriftEuropean Journal of Biochemistry
Vol/bind198
Udgave nummer1
Sider (fra-til)25-30
Antal sider5
ISSN0014-2956
StatusUdgivet - 23. maj 1991

Fingeraftryk

Casein Kinase II
Holoenzymes
Enzymes
DEAE-Cellulose Chromatography
Agarose Chromatography
Peptides
Recombinant Proteins
Proteins
Complementary DNA
Salts
Ions

Citer dette

@article{3390c2c05a4211de839d000ea68e967b,
title = "Isolation and characterization of recombinant human casein kinase II subunits alpha and beta from bacteria",
abstract = "cDNA encoding the casein kinase II (CKII) subunits alpha and beta of human origin were expressed in Escherichia coli using expression vector pT7-7. Significant expression was obtained with E. coli BL21(DE3). The CKII subunits accounted for approximately 30{\%} of the bacterial protein; however, most of the expressed proteins were produced in an insoluble form. The recombinant CKII alpha subunit was purified by DEAE-cellulose chromatography, followed by phosphocellulose and heparin-agarose chromatography. The recombinant CKII beta subunit was extracted from the insoluble pellet and purified in a single step on phosphocellulose. From 10 g bacterial cells, the yield of soluble protein was 12 mg alpha subunit and 5 mg beta subunit. SDS/PAGE analysis of the purified recombinant proteins indicated molecular masses of 42 kDa and 26 kDa for the alpha and beta subunits, respectively, in agreement with the molecular masses determined for the subunits of the native enzyme. The recombinant alpha subunit exhibited protein kinase activity which was greatest in the absence of monovalent ions. With increasing amounts of salt, alpha subunit kinase activity declined rapidly. Addition of the beta subunit led to maximum stimulation at a 1:1 ratio of both subunits. Using a synthetic peptide (RRRDDDSDDD) as a substrate, the maximum protein kinase stimulation observed was fourfold under the conditions used. The Km of the reconstituted enzyme for the synthetic peptide (80 microM) was comparable to the mammalian enzyme (40-60 microM), whereas the alpha subunit alone had a Km of 240 microM. After sucrose density gradient analysis, the reconstituted holoenzyme sedimented at the same position as the mammalian CKII holoenzyme.",
keywords = "Animals, Base Sequence, Casein Kinases, Cloning, Molecular, DNA, Electrophoresis, Polyacrylamide Gel, Enzyme Activation, Escherichia coli, Gene Expression Regulation, Bacterial, Genes, Bacterial, Humans, Liver, Molecular Sequence Data, Protein Kinases, Rats, Recombinant Proteins",
author = "N Grankowski and B Boldyreff and Issinger, {O G}",
year = "1991",
month = "5",
day = "23",
language = "English",
volume = "198",
pages = "25--30",
journal = "European Journal of Biochemistry",
issn = "0014-2956",
publisher = "AAAI Press",
number = "1",

}

Isolation and characterization of recombinant human casein kinase II subunits alpha and beta from bacteria. / Grankowski, N; Boldyreff, B; Issinger, O G.

I: European Journal of Biochemistry, Bind 198, Nr. 1, 23.05.1991, s. 25-30.

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningpeer review

TY - JOUR

T1 - Isolation and characterization of recombinant human casein kinase II subunits alpha and beta from bacteria

AU - Grankowski, N

AU - Boldyreff, B

AU - Issinger, O G

PY - 1991/5/23

Y1 - 1991/5/23

N2 - cDNA encoding the casein kinase II (CKII) subunits alpha and beta of human origin were expressed in Escherichia coli using expression vector pT7-7. Significant expression was obtained with E. coli BL21(DE3). The CKII subunits accounted for approximately 30% of the bacterial protein; however, most of the expressed proteins were produced in an insoluble form. The recombinant CKII alpha subunit was purified by DEAE-cellulose chromatography, followed by phosphocellulose and heparin-agarose chromatography. The recombinant CKII beta subunit was extracted from the insoluble pellet and purified in a single step on phosphocellulose. From 10 g bacterial cells, the yield of soluble protein was 12 mg alpha subunit and 5 mg beta subunit. SDS/PAGE analysis of the purified recombinant proteins indicated molecular masses of 42 kDa and 26 kDa for the alpha and beta subunits, respectively, in agreement with the molecular masses determined for the subunits of the native enzyme. The recombinant alpha subunit exhibited protein kinase activity which was greatest in the absence of monovalent ions. With increasing amounts of salt, alpha subunit kinase activity declined rapidly. Addition of the beta subunit led to maximum stimulation at a 1:1 ratio of both subunits. Using a synthetic peptide (RRRDDDSDDD) as a substrate, the maximum protein kinase stimulation observed was fourfold under the conditions used. The Km of the reconstituted enzyme for the synthetic peptide (80 microM) was comparable to the mammalian enzyme (40-60 microM), whereas the alpha subunit alone had a Km of 240 microM. After sucrose density gradient analysis, the reconstituted holoenzyme sedimented at the same position as the mammalian CKII holoenzyme.

AB - cDNA encoding the casein kinase II (CKII) subunits alpha and beta of human origin were expressed in Escherichia coli using expression vector pT7-7. Significant expression was obtained with E. coli BL21(DE3). The CKII subunits accounted for approximately 30% of the bacterial protein; however, most of the expressed proteins were produced in an insoluble form. The recombinant CKII alpha subunit was purified by DEAE-cellulose chromatography, followed by phosphocellulose and heparin-agarose chromatography. The recombinant CKII beta subunit was extracted from the insoluble pellet and purified in a single step on phosphocellulose. From 10 g bacterial cells, the yield of soluble protein was 12 mg alpha subunit and 5 mg beta subunit. SDS/PAGE analysis of the purified recombinant proteins indicated molecular masses of 42 kDa and 26 kDa for the alpha and beta subunits, respectively, in agreement with the molecular masses determined for the subunits of the native enzyme. The recombinant alpha subunit exhibited protein kinase activity which was greatest in the absence of monovalent ions. With increasing amounts of salt, alpha subunit kinase activity declined rapidly. Addition of the beta subunit led to maximum stimulation at a 1:1 ratio of both subunits. Using a synthetic peptide (RRRDDDSDDD) as a substrate, the maximum protein kinase stimulation observed was fourfold under the conditions used. The Km of the reconstituted enzyme for the synthetic peptide (80 microM) was comparable to the mammalian enzyme (40-60 microM), whereas the alpha subunit alone had a Km of 240 microM. After sucrose density gradient analysis, the reconstituted holoenzyme sedimented at the same position as the mammalian CKII holoenzyme.

KW - Animals

KW - Base Sequence

KW - Casein Kinases

KW - Cloning, Molecular

KW - DNA

KW - Electrophoresis, Polyacrylamide Gel

KW - Enzyme Activation

KW - Escherichia coli

KW - Gene Expression Regulation, Bacterial

KW - Genes, Bacterial

KW - Humans

KW - Liver

KW - Molecular Sequence Data

KW - Protein Kinases

KW - Rats

KW - Recombinant Proteins

M3 - Journal article

C2 - 2040287

VL - 198

SP - 25

EP - 30

JO - European Journal of Biochemistry

JF - European Journal of Biochemistry

SN - 0014-2956

IS - 1

ER -