This old version of Proteopedia is provided for student assignments while the new version is undergoing repairs. Content and edits done in this old version of Proteopedia after March 1, 2026 will eventually be lost when it is retired in about June of 2026.

Apply for new accounts at the new Proteopedia. Your logins will work in both the old and new versions.

1k5o

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 17:43, 24 December 2014

CPI-17(35-120) deletion mutant

Structural highlights

1k5o is a 1 chain structure with sequence from Sus scrofa. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Gene:	porcine aorta (Sus scrofa)
Resources:	FirstGlance, OCA, RCSB, PDBsum

Function

[PP14A_PIG] Inhibitor of PPP1CA. Has over 1000-fold higher inhibitory activity when phosphorylated, creating a molecular switch for regulating the phosphorylation status of PPP1CA substrates and smooth muscle contraction.^[1] ^[2] ^[3] ^[4]

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

Publication Abstract from PubMed

Contractility of vascular smooth muscle depends on phosphorylation of myosin light chains, and is modulated by hormonal control of myosin phosphatase activity. Signaling pathways activate kinases such as PKC or Rho-dependent kinases that phosphorylate the myosin phosphatase inhibitor protein called CPI-17. Phosphorylation of CPI-17 at Thr38 enhances its inhibitory potency 1000-fold, creating a molecular on/off switch for regulating contraction. We report the solution NMR structure of the CPI-17 inhibitory domain (residues 35-120), which retains the signature biological properties of the full-length protein. The final ensemble of 20 sets of NMR coordinates overlaid onto their mean structure with r.m.s.d. values of 0.84(+/-0.22) A for the backbone atoms. The protein forms a novel four-helix, V-shaped bundle comprised of a central anti-parallel helix pair (B/C helices) flanked by two large spiral loops formed by the N and C termini that are held together by another anti-parallel helix pair (A/D helices) stabilized by intercalated aromatic and aliphatic side-chains. Chemical shift perturbations indicated that phosphorylation of Thr38 induces a conformational change involving displacement of helix A, without significant movement of the other three helices. This conformational change seems to flex one arm of the molecule, thereby exposing new surfaces of the helix A and the nearby phosphorylation loop to form specific interactions with the catalytic site of the phosphatase. This phosphorylation-dependent conformational change offers new structural insights toward understanding the specificity of CPI-17 for myosin phosphatase and its function as a molecular switch.

Solution NMR structure of the myosin phosphatase inhibitor protein CPI-17 shows phosphorylation-induced conformational changes responsible for activation.,Ohki S, Eto M, Kariya E, Hayano T, Hayashi Y, Yazawa M, Brautigan D, Kainosho M J Mol Biol. 2001 Dec 7;314(4):839-49. PMID:11734001^[5]

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine.

References

↑ Eto M, Senba S, Morita F, Yazawa M. Molecular cloning of a novel phosphorylation-dependent inhibitory protein of protein phosphatase-1 (CPI17) in smooth muscle: its specific localization in smooth muscle. FEBS Lett. 1997 Jun 30;410(2-3):356-60. PMID:9237662
↑ Eto M, Ohmori T, Suzuki M, Furuya K, Morita F. A novel protein phosphatase-1 inhibitory protein potentiated by protein kinase C. Isolation from porcine aorta media and characterization. J Biochem. 1995 Dec;118(6):1104-7. PMID:8720121
↑ Hamaguchi T, Ito M, Feng J, Seko T, Koyama M, Machida H, Takase K, Amano M, Kaibuchi K, Hartshorne DJ, Nakano T. Phosphorylation of CPI-17, an inhibitor of myosin phosphatase, by protein kinase N. Biochem Biophys Res Commun. 2000 Aug 11;274(3):825-30. PMID:10924361 doi:http://dx.doi.org/10.1006/bbrc.2000.3225
↑ Koyama M, Ito M, Feng J, Seko T, Shiraki K, Takase K, Hartshorne DJ, Nakano T. Phosphorylation of CPI-17, an inhibitory phosphoprotein of smooth muscle myosin phosphatase, by Rho-kinase. FEBS Lett. 2000 Jun 23;475(3):197-200. PMID:10869555
↑ Ohki S, Eto M, Kariya E, Hayano T, Hayashi Y, Yazawa M, Brautigan D, Kainosho M. Solution NMR structure of the myosin phosphatase inhibitor protein CPI-17 shows phosphorylation-induced conformational changes responsible for activation. J Mol Biol. 2001 Dec 7;314(4):839-49. PMID:11734001 doi:http://dx.doi.org/10.1006/jmbi.2001.5200

1 Structural highlights
2 Function
3 Evolutionary Conservation
4 Publication Abstract from PubMed
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/1k5o"

@@ Line 3: / Line 3: @@
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1k5o]] is a 1 chain structure with sequence from [http://en.wikipedia.org/wiki/Sus_scrofa Sus scrofa]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1K5O OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1K5O FirstGlance]. <br>
-</td></tr><tr><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">porcine aorta ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9823 Sus scrofa])</td></tr>
+</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">porcine aorta ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9823 Sus scrofa])</td></tr>
-<tr><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1k5o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k5o OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1k5o RCSB], [http://www.ebi.ac.uk/pdbsum/1k5o PDBsum]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1k5o FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1k5o OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1k5o RCSB], [http://www.ebi.ac.uk/pdbsum/1k5o PDBsum]</span></td></tr>
-<table>
+</table>
+== Function ==
+[[http://www.uniprot.org/uniprot/PP14A_PIG PP14A_PIG]] Inhibitor of PPP1CA. Has over 1000-fold higher inhibitory activity when phosphorylated, creating a molecular switch for regulating the phosphorylation status of PPP1CA substrates and smooth muscle contraction.<ref>PMID:9237662</ref> <ref>PMID:8720121</ref> <ref>PMID:10924361</ref> <ref>PMID:10869555</ref>
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 29: / Line 31: @@
 </StructureSection>
 [[Category: Sus scrofa]]
-[[Category: Brautigan, D.]]
+[[Category: Brautigan, D]]
-[[Category: Eto, M.]]
+[[Category: Eto, M]]
-[[Category: Hayano, T.]]
+[[Category: Hayano, T]]
-[[Category: Hayashi, Y.]]
+[[Category: Hayashi, Y]]
-[[Category: Kainosho, M.]]
+[[Category: Kainosho, M]]
-[[Category: Kariya, E.]]
+[[Category: Kariya, E]]
-[[Category: Ohki, S.]]
+[[Category: Ohki, S]]
-[[Category: Yazawa, M.]]
+[[Category: Yazawa, M]]
 [[Category: Mlcp-inhibitor]]
 [[Category: Phosphorylation]]
 [[Category: Pp1-inhibitor]]
 [[Category: Protein binding]]

1k5o

From Proteopedia

Revision as of 17:43, 24 December 2014

CPI-17(35-120) deletion mutant

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox