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1tki

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{{STRUCTURE_1tki| PDB=1tki | SCENE= }}
{{STRUCTURE_1tki| PDB=1tki | SCENE= }}
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'''AUTOINHIBITED SERINE KINASE DOMAIN OF THE GIANT MUSCLE PROTEIN TITIN'''
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===AUTOINHIBITED SERINE KINASE DOMAIN OF THE GIANT MUSCLE PROTEIN TITIN===
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==Overview==
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The giant muscle protein titin (connectin) is essential in the temporal and spatial control of the assembly of the highly ordered sarcomeres (contractile units) of striated muscle. Here we present the crystal structure of titin's only catalytic domain, an autoregulated serine kinase (titin kinase). The structure shows how the active site is inhibited by a tyrosine of the kinase domain. We describe a dual mechanism of activation of titin kinase that consists of phosphorylation of this tyrosine and binding of calcium/calmodulin to the regulatory tail. The serine kinase domain of titin is the first known non-arginine-aspartate kinase to be activated by phosphorylation. The phosphorylated tyrosine is not located in the activation segment, as in other kinases, but in the P + 1 loop, indicating that this tyrosine is a binding partner of the titin kinase substrate. Titin kinase phosphorylates the muscle protein telethonin in early differentiating myocytes, indicating that this kinase may act in myofibrillogenesis.
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(as it appears on PubMed at http://www.pubmed.gov), where 9804419 is the PubMed ID number.
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{{ABSTRACT_PUBMED_9804419}}
==About this Structure==
==About this Structure==
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[[Category: Serine kinase]]
[[Category: Serine kinase]]
[[Category: Titin]]
[[Category: Titin]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 10:03:46 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Mon Jul 28 02:05:52 2008''

Revision as of 23:05, 27 July 2008

Image:1tki.png

Template:STRUCTURE 1tki

AUTOINHIBITED SERINE KINASE DOMAIN OF THE GIANT MUSCLE PROTEIN TITIN

Template:ABSTRACT PUBMED 9804419

About this Structure

1TKI is a Single protein structure of sequence from Homo sapiens. Full crystallographic information is available from OCA.

Reference

Structural basis for activation of the titin kinase domain during myofibrillogenesis., Mayans O, van der Ven PF, Wilm M, Mues A, Young P, Furst DO, Wilmanns M, Gautel M, Nature. 1998 Oct 29;395(6705):863-9. PMID:9804419

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