Catalytic properties of ADAM12 and its domain deletion mutants.
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Catalytic properties of ADAM12 and its domain deletion mutants. / Jacobsen, Jonas; Visse, Robert; Sørensen, Hans Peter; Enghild, Jan J; Brew, Keith; Wewer, Ulla M; Nagase, Hideaki.
In: Biochemistry, Vol. 47, No. 2, 2008, p. 537-547.Research output: Contribution to journal › Journal article › Research › peer-review
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TY - JOUR
T1 - Catalytic properties of ADAM12 and its domain deletion mutants.
AU - Jacobsen, Jonas
AU - Visse, Robert
AU - Sørensen, Hans Peter
AU - Enghild, Jan J
AU - Brew, Keith
AU - Wewer, Ulla M
AU - Nagase, Hideaki
N1 - Keywords: ADAM Proteins; Amino Acid Sequence; Animals; Calcium; Catalysis; Electrophoresis, Polyacrylamide Gel; Guinea Pigs; Humans; Hydrogen-Ion Concentration; Kinetics; Membrane Proteins; Metals; Molecular Sequence Data; Mutant Proteins; Protein Isoforms; Protein Structure, Tertiary; Recombinant Proteins; Sequence Analysis, Protein; Sequence Deletion; Sodium Chloride; Substrate Specificity; Tissue Inhibitor of Metalloproteinases; Transferrin
PY - 2008
Y1 - 2008
N2 - Human ADAM12 (a disintegrin and metalloproteinase) is a multidomain zinc metalloproteinase expressed at high levels during development and in human tumors. ADAM12 exists as two splice variants: a classical type 1 membrane-anchored form (ADAM12-L) and a secreted splice variant (ADAM12-S) consisting of pro, catalytic, disintegrin, cysteine-rich, and EGF domains. Here we present a novel activity of recombinant ADAM12-S and its domain deletion mutants on S-carboxymethylated transferrin (Cm-Tf). Cleavage of Cm-Tf occurred at multiple sites, and N-terminal sequencing showed that the enzyme exhibits restricted specificity but a consensus sequence could not be defined as its subsite requirements are promiscuous. Kinetic analysis revealed that the noncatalytic C-terminal domains are important regulators of Cm-Tf activity and that ADAM12-PC consisting of the pro domain and catalytic domain is the most active on this substrate. It was also observed that NaCl inhibits ADAM12. Among the tissue inhibitors of metalloproteinases (TIMP) examined, the N-terminal domain of TIMP-3 (N-TIMP-3) inhibits ADAM12-S and ADAM12-PC with low nanomolar Ki(app) values while TIMP-2 inhibits them with a slightly lower affinity (9-44 nM). However, TIMP-1 is a much weaker inhibitor. N-TIMP-3 variants that lack MMP inhibitory activity but retained the ability to inhibit ADAM17/TACE failed to inhibit ADAM12. These results indicate unique enzymatic properties of ADAM12 among the members of the ADAM family of metalloproteinases.
AB - Human ADAM12 (a disintegrin and metalloproteinase) is a multidomain zinc metalloproteinase expressed at high levels during development and in human tumors. ADAM12 exists as two splice variants: a classical type 1 membrane-anchored form (ADAM12-L) and a secreted splice variant (ADAM12-S) consisting of pro, catalytic, disintegrin, cysteine-rich, and EGF domains. Here we present a novel activity of recombinant ADAM12-S and its domain deletion mutants on S-carboxymethylated transferrin (Cm-Tf). Cleavage of Cm-Tf occurred at multiple sites, and N-terminal sequencing showed that the enzyme exhibits restricted specificity but a consensus sequence could not be defined as its subsite requirements are promiscuous. Kinetic analysis revealed that the noncatalytic C-terminal domains are important regulators of Cm-Tf activity and that ADAM12-PC consisting of the pro domain and catalytic domain is the most active on this substrate. It was also observed that NaCl inhibits ADAM12. Among the tissue inhibitors of metalloproteinases (TIMP) examined, the N-terminal domain of TIMP-3 (N-TIMP-3) inhibits ADAM12-S and ADAM12-PC with low nanomolar Ki(app) values while TIMP-2 inhibits them with a slightly lower affinity (9-44 nM). However, TIMP-1 is a much weaker inhibitor. N-TIMP-3 variants that lack MMP inhibitory activity but retained the ability to inhibit ADAM17/TACE failed to inhibit ADAM12. These results indicate unique enzymatic properties of ADAM12 among the members of the ADAM family of metalloproteinases.
U2 - 10.1021/bi701629c
DO - 10.1021/bi701629c
M3 - Journal article
C2 - 18081311
VL - 47
SP - 537
EP - 547
JO - Biochemistry
JF - Biochemistry
SN - 0006-2960
IS - 2
ER -
ID: 4851891