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Title: Characterization of novel calmodulin-binding peptides with distinct inhibitory effects on calmodulin-dependent enzymes
Authors: Nevalainen, L.T.
Aoyama, T.
Ikura, M.
Crivici, A.
Yan, H. 
Chua, N.-H.
Nairn, A.C.
Issue Date: 1-Jan-1997
Citation: Nevalainen, L.T.,Aoyama, T.,Ikura, M.,Crivici, A.,Yan, H.,Chua, N.-H.,Nairn, A.C. (1997-01-01). Characterization of novel calmodulin-binding peptides with distinct inhibitory effects on calmodulin-dependent enzymes. Biochemical Journal 321 (1) : 107-115. ScholarBank@NUS Repository.
Abstract: We describe the isolation and interaction with calmodulin (CaM) of two 10-amino-acid peptides (termed peptides 1 and 2; AWDTVRISFG and AWPSLQAIRG respectively) derived from a phage random peptide display library. Both peptides are shorter than previously described CaM-binding peptides and lack certain features found in the sequences of CaM-binding domains present in CaM-activated enzymes. However, 1H NMR spectroscopy and fluorimetry indicate that both peptides interact with CaM in the presence of Ca2+. The two peptides differentially inhibited CaM-dependent kinases I and II (CaM kinases I and II) but did not affect CaM-dependent phosphodiesterase. Peptide 1 inhibited CaM kinase I but not CaM kinase II, whereas peptide 2 inhibited CaM kinase II, but only partially inhibited CaM kinase I at a more than 10-fold higher concentration. Peptide 1 also inhibited a plant calcium-dependent protein kinase, whereas peptide 2 did not. The ability of peptides 1 and 2 to differentially inhibit CaM-dependent kinases and CaM-dependent phosphodiesterase suggests that they may bind to distinct regions of CaM that are specifically responsible for activation of different CaM-dependent enzymes.
Source Title: Biochemical Journal
ISSN: 02646021
Appears in Collections:Staff Publications

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