Pcp4l1 contains an auto-inhibitory element that prevents its IQ motif from binding to calmodulin.
Pcp4l1 contains an auto-inhibitory element that prevents its IQ motif from binding to calmodulin.
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DOI:
10.1111/j.1471-4159.2012.07745.x
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发表时间:
2012-06
影响因子:
4.7
通讯作者:
Morgan JI
中科院分区:
文献类型:
--
作者:
Morgan MA;Morgan JI
Purkinje cell protein 4-like 1 (Pcp4l1) is a small neuronal IQ motif protein closely related to the calmodulin binding protein Pcp4/PEP-19. PEP-19 interacts with calmodulin via its IQ motif to inhibit calmodulin-dependent enzymes and we hypothesized Pcp4l1 would have similar properties. Surprisingly, full length Pcp4l1 does not interact with calmodulin in yeast two-hybrid or pulldown experiments yet a synthetic peptide constituting only the IQ motif of Pcp4l1 binds calmodulin and inhibits calmodulin-dependent kinase II. A nine-residue glutamic acid rich sequence in Pcp4l1 confers these unexpected properties. This element lies outside the IQ motif and its deletion or exchange with the homologous region of PEP-19 restores calmodulin binding. Conversion of a single isoleucine (Ile36) within this motif to phenylalanine, the residue present in PEP-19, imparts calmodulin binding onto Pcp4l1. Moreover, only aromatic amino acid substitutions at position 36 in Pcp4l1 allow binding. Thus, despite their sequence similarities PEP-19 and Pcp4l1 have distinct properties with the latter harboring an element that can functionally suppress an IQ motif. We speculate Pcp4l1 may be a latent calmodulin inhibitor regulated by post-translational modification and/or co-factor interactions.
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影响因子:
4.8
作者:
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通讯作者:
Putkey, John A.
影响因子:
11.4
作者:
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通讯作者:
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作者:
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作者:
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通讯作者:
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DOI:
10.1159/000134623
发表时间:
1997-01-01
期刊:
CYTOGENETICS AND CELL GENETICS
影响因子:
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作者:
Hubert, RS;Korenberg, JR
通讯作者:
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