Calcium/calmodulin-dependent protein kinase kinase

Identification of regulatory domains

Hiroshi Tokumitsu, Gary A. Wayman, Masaaki Muramatsu, Thomas R. Soderling

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

We recently cloned a calmodulin-dependent protein kinase kinase (CaM- KK) which phosphorylates and activates CaM-KI and CaM-KIV [Tokumitsu, H., Enslen, H., and Soderling, T. R. (1995) J. Biol. Chem. 270, 19320-19324]. In the present study, we have identified its regulatory CaM-binding and autoinhibitory domains (CBD and AID, respectively) using a series of COOH- terminal truncations and site-directed mutants expressed in COS-7 cells. Truncation mutant CaM-KK1-463 activated CaM-KIV and bound CaM similar to wild-type enzyme (CaM-KK1-505); CaM-KK1-448 did not bind CaM and was largely inactive; and CaM-KK1-434 also did not bind CaM but activated a CaM-independent mutant of CaM-KIV in the absence of Ca2+/CaM. Substitution of triple negative charges (Asp) at positions 455RKR, 448ILV, or 443SWT blocked CaM binding and suppressed by 70-90% CaM-KK activities. Mutants 438VKL and 435KNS to DDD exhibited partial Ca2+/CaM-independent activities. These results identify overlapping AID and CBD between residues 430 and 460 in CaM-KK, similar to other CaM-Ks. Consistent with this assignment, the synthetic peptide corresponding to residues 438-463 bound CaM in a Ca2+dependent manner with a K(d) in the low nanomolar range. Furthermore, phosphorylation by cAMP-kinase of Ser458 at the COOH-terminus of the CBD in CaM-KK, which suppresses subsequent CaM binding [Wayman, G., Tokumitsu, H., and Soderling, T. R. (1997) J. Biol. Chem. 272, 16073-16076], was blocked by prior binding of Ca2+/CaM to CaM- KK.

Original languageEnglish
Pages (from-to)12823-12827
Number of pages5
JournalBiochemistry
Volume36
Issue number42
DOIs
Publication statusPublished - Oct 21 1997
Externally publishedYes

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Calcium-Calmodulin-Dependent Protein Kinase Kinase
Calcium-Calmodulin-Dependent Protein Kinases
Phosphotransferases
Dichlorodiphenyldichloroethane
Phosphorylation
COS Cells
Viperidae
Substitution reactions
Peptides
Enzymes

ASJC Scopus subject areas

  • Biochemistry

Cite this

Calcium/calmodulin-dependent protein kinase kinase : Identification of regulatory domains. / Tokumitsu, Hiroshi; Wayman, Gary A.; Muramatsu, Masaaki; Soderling, Thomas R.

In: Biochemistry, Vol. 36, No. 42, 21.10.1997, p. 12823-12827.

Research output: Contribution to journalArticle

Tokumitsu, Hiroshi ; Wayman, Gary A. ; Muramatsu, Masaaki ; Soderling, Thomas R. / Calcium/calmodulin-dependent protein kinase kinase : Identification of regulatory domains. In: Biochemistry. 1997 ; Vol. 36, No. 42. pp. 12823-12827.
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abstract = "We recently cloned a calmodulin-dependent protein kinase kinase (CaM- KK) which phosphorylates and activates CaM-KI and CaM-KIV [Tokumitsu, H., Enslen, H., and Soderling, T. R. (1995) J. Biol. Chem. 270, 19320-19324]. In the present study, we have identified its regulatory CaM-binding and autoinhibitory domains (CBD and AID, respectively) using a series of COOH- terminal truncations and site-directed mutants expressed in COS-7 cells. Truncation mutant CaM-KK1-463 activated CaM-KIV and bound CaM similar to wild-type enzyme (CaM-KK1-505); CaM-KK1-448 did not bind CaM and was largely inactive; and CaM-KK1-434 also did not bind CaM but activated a CaM-independent mutant of CaM-KIV in the absence of Ca2+/CaM. Substitution of triple negative charges (Asp) at positions 455RKR, 448ILV, or 443SWT blocked CaM binding and suppressed by 70-90{\%} CaM-KK activities. Mutants 438VKL and 435KNS to DDD exhibited partial Ca2+/CaM-independent activities. These results identify overlapping AID and CBD between residues 430 and 460 in CaM-KK, similar to other CaM-Ks. Consistent with this assignment, the synthetic peptide corresponding to residues 438-463 bound CaM in a Ca2+dependent manner with a K(d) in the low nanomolar range. Furthermore, phosphorylation by cAMP-kinase of Ser458 at the COOH-terminus of the CBD in CaM-KK, which suppresses subsequent CaM binding [Wayman, G., Tokumitsu, H., and Soderling, T. R. (1997) J. Biol. Chem. 272, 16073-16076], was blocked by prior binding of Ca2+/CaM to CaM- KK.",
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