2a05

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{{STRUCTURE_2a05| PDB=2a05 | SCENE= }}
{{STRUCTURE_2a05| PDB=2a05 | SCENE= }}
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'''The cysteine-rich secretory protein domain of Tpx-1 is related to ion channel toxins and regulates Ryanodine receptor Ca2+ signaling'''
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===The cysteine-rich secretory protein domain of Tpx-1 is related to ion channel toxins and regulates Ryanodine receptor Ca2+ signaling===
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==Overview==
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The cysteine-rich secretory proteins (Crisp) are predominantly found in the mammalian male reproductive tract as well as in the venom of reptiles. Crisps are two domain proteins with a structurally similar yet evolutionary diverse N-terminal domain and a characteristic cysteine-rich C-terminal domain, which we refer to as the Crisp domain. We presented the NMR solution structure of the Crisp domain of mouse Tpx-1, and we showed that it contains two subdomains, one of which has a similar fold to the ion channel regulators BgK and ShK. Furthermore, we have demonstrated for the first time that the ion channel regulatory activity of Crisp proteins is attributed to the Crisp domain. Specifically, the Tpx-1 Crisp domain inhibited cardiac ryanodine receptor (RyR) 2 with an IC(50) between 0.5 and 1.0 microM and activated the skeletal RyR1 with an AC(50) between 1 and 10 microM when added to the cytoplasmic domain of the receptor. This activity was nonvoltage-dependent and weakly voltage-dependent, respectively. Furthermore, the Tpx-1 Crisp domain activated both RyR forms at negative bilayer potentials and showed no effect at positive bilayer potentials when added to the luminal domain of the receptor. These data show that the Tpx-1 Crisp domain on its own can regulate ion channel activity and provide compelling evidence for a role for Tpx-1 in the regulation of Ca(2+) fluxes observed during sperm capacitation.
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(as it appears on PubMed at http://www.pubmed.gov), where 16339766 is the PubMed ID number.
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{{ABSTRACT_PUBMED_16339766}}
==About this Structure==
==About this Structure==
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2A05 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A05 OCA].
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2A05 is a [[Single protein]] structure of sequence from [http://en.wikipedia.org/wiki/Mus_musculus Mus musculus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=2A05 OCA].
==Reference==
==Reference==
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[[Category: 3 alpha helice]]
[[Category: 3 alpha helice]]
[[Category: 5 disulphide bond]]
[[Category: 5 disulphide bond]]
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sat May 3 18:26:40 2008''
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''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Sun Jul 27 22:46:26 2008''

Revision as of 19:46, 27 July 2008

Image:2a05.png

Template:STRUCTURE 2a05

The cysteine-rich secretory protein domain of Tpx-1 is related to ion channel toxins and regulates Ryanodine receptor Ca2+ signaling

Template:ABSTRACT PUBMED 16339766

About this Structure

2A05 is a Single protein structure of sequence from Mus musculus. Full experimental information is available from OCA.

Reference

The cysteine-rich secretory protein domain of Tpx-1 is related to ion channel toxins and regulates ryanodine receptor Ca2+ signaling., Gibbs GM, Scanlon MJ, Swarbrick J, Curtis S, Gallant E, Dulhunty AF, O'Bryan MK, J Biol Chem. 2006 Feb 17;281(7):4156-63. Epub 2005 Dec 9. PMID:16339766

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