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6c5x

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Revision as of 08:54, 11 November 2020

Crystal Structure of SOCS1 in complex with ElonginB and ElonginC

Structural highlights

6c5x is a 7 chain structure. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
NonStd Res:
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[ELOB_HUMAN] SIII, also known as elongin, is a general transcription elongation factor that increases the RNA polymerase II transcription elongation past template-encoded arresting sites. Subunit A is transcriptionally active and its transcription activity is strongly enhanced by binding to the dimeric complex of the SIII regulatory subunits B and C (elongin BC complex).^[1] ^[2] The elongin BC complex seems to be involved as an adapter protein in the proteasomal degradation of target proteins via different E3 ubiquitin ligase complexes, including the von Hippel-Lindau ubiquitination complex CBC(VHL). By binding to BC-box motifs it seems to link target recruitment subunits, like VHL and members of the SOCS box family, to Cullin/RBX1 modules that activate E2 ubiquitination enzymes.^[3] ^[4] [ELOC_HUMAN] SIII, also known as elongin, is a general transcription elongation factor that increases the RNA polymerase II transcription elongation past template-encoded arresting sites. Subunit A is transcriptionally active and its transcription activity is strongly enhanced by binding to the dimeric complex of the SIII regulatory subunits B and C (elongin BC complex).^[5] The elongin BC complex seems to be involved as an adapter protein in the proteasomal degradation of target proteins via different E3 ubiquitin ligase complexes, including the von Hippel-Lindau ubiquitination complex CBC(VHL). By binding to BC-box motifs it seems to link target recruitment subunits, like VHL and members of the SOCS box family, to Cullin/RBX1 modules that activate E2 ubiquitination enzymes.^[6]

Publication Abstract from PubMed

The SOCS family of proteins are negative-feedback inhibitors of signalling induced by cytokines that act via the JAK/STAT pathway. SOCS proteins can act as ubiquitin ligases by recruiting Cullin5 to ubiquitinate signalling components; however, SOCS1, the most potent member of the family, can also inhibit JAK directly. Here we determine the structural basis of both these modes of inhibition. Due to alterations within the SOCS box domain, SOCS1 has a compromised ability to recruit Cullin5; however, it is a direct, potent and selective inhibitor of JAK catalytic activity. The kinase inhibitory region of SOCS1 targets the substrate binding groove of JAK with high specificity and thereby blocks any subsequent phosphorylation. SOCS1 is a potent inhibitor of the interferon gamma (IFNgamma) pathway, however, it does not bind the IFNgamma receptor, making its mode-of-action distinct from SOCS3. These findings reveal the mechanism used by SOCS1 to inhibit signalling by inflammatory cytokines.

The molecular basis of JAK/STAT inhibition by SOCS1.,Liau NPD, Laktyushin A, Lucet IS, Murphy JM, Yao S, Whitlock E, Callaghan K, Nicola NA, Kershaw NJ, Babon JJ Nat Commun. 2018 Apr 19;9(1):1558. doi: 10.1038/s41467-018-04013-1. PMID:29674694^[7]

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

References

↑ Garrett KP, Aso T, Bradsher JN, Foundling SI, Lane WS, Conaway RC, Conaway JW. Positive regulation of general transcription factor SIII by a tailed ubiquitin homolog. Proc Natl Acad Sci U S A. 1995 Aug 1;92(16):7172-6. PMID:7638163
↑ Kario E, Marmor MD, Adamsky K, Citri A, Amit I, Amariglio N, Rechavi G, Yarden Y. Suppressors of cytokine signaling 4 and 5 regulate epidermal growth factor receptor signaling. J Biol Chem. 2005 Feb 25;280(8):7038-48. Epub 2004 Dec 7. PMID:15590694 doi:10.1074/jbc.M408575200
↑ Garrett KP, Aso T, Bradsher JN, Foundling SI, Lane WS, Conaway RC, Conaway JW. Positive regulation of general transcription factor SIII by a tailed ubiquitin homolog. Proc Natl Acad Sci U S A. 1995 Aug 1;92(16):7172-6. PMID:7638163
↑ Kario E, Marmor MD, Adamsky K, Citri A, Amit I, Amariglio N, Rechavi G, Yarden Y. Suppressors of cytokine signaling 4 and 5 regulate epidermal growth factor receptor signaling. J Biol Chem. 2005 Feb 25;280(8):7038-48. Epub 2004 Dec 7. PMID:15590694 doi:10.1074/jbc.M408575200
↑ Kario E, Marmor MD, Adamsky K, Citri A, Amit I, Amariglio N, Rechavi G, Yarden Y. Suppressors of cytokine signaling 4 and 5 regulate epidermal growth factor receptor signaling. J Biol Chem. 2005 Feb 25;280(8):7038-48. Epub 2004 Dec 7. PMID:15590694 doi:10.1074/jbc.M408575200
↑ Kario E, Marmor MD, Adamsky K, Citri A, Amit I, Amariglio N, Rechavi G, Yarden Y. Suppressors of cytokine signaling 4 and 5 regulate epidermal growth factor receptor signaling. J Biol Chem. 2005 Feb 25;280(8):7038-48. Epub 2004 Dec 7. PMID:15590694 doi:10.1074/jbc.M408575200
↑ Liau NPD, Laktyushin A, Lucet IS, Murphy JM, Yao S, Whitlock E, Callaghan K, Nicola NA, Kershaw NJ, Babon JJ. The molecular basis of JAK/STAT inhibition by SOCS1. Nat Commun. 2018 Apr 19;9(1):1558. doi: 10.1038/s41467-018-04013-1. PMID:29674694 doi:http://dx.doi.org/10.1038/s41467-018-04013-1

1 Structural highlights
2 Function
3 Publication Abstract from PubMed
4 See Also
5 References

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/6c5x"

@@ Line 1: / Line 1: @@
 ==Crystal Structure of SOCS1 in complex with ElonginB and ElonginC==
-<StructureSection load='6c5x' size='340' side='right' caption='[[6c5x]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
+<StructureSection load='6c5x' size='340' side='right'caption='[[6c5x]], [[Resolution|resolution]] 3.10&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[6c5x]] is a 7 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6C5X OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=6C5X FirstGlance]. <br>
+<table><tr><td colspan='2'>[[6c5x]] is a 7 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=6C5X OCA]. For a <b>guided tour on the structure components</b> use [http://proteopedia.org/fgij/fg.htm?mol=6C5X FirstGlance]. <br>
 </td></tr><tr id='NonStdRes'><td class="sblockLbl"><b>[[Non-Standard_Residue|NonStd Res:]]</b></td><td class="sblockDat"><scene name='pdbligand=PTR:O-PHOSPHOTYROSINE'>PTR</scene></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=6c5x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6c5x OCA], [http://pdbe.org/6c5x PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6c5x RCSB], [http://www.ebi.ac.uk/pdbsum/6c5x PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6c5x ProSAT]</span></td></tr>
+<tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[http://proteopedia.org/fgij/fg.htm?mol=6c5x FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=6c5x OCA], [http://pdbe.org/6c5x PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=6c5x RCSB], [http://www.ebi.ac.uk/pdbsum/6c5x PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=6c5x ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 18: / Line 18: @@
 </div>
 <div class="pdbe-citations 6c5x" style="background-color:#fffaf0;"></div>
+==See Also==
+*[[Elongation factor 3D structures|Elongation factor 3D structures]]
 == References ==
 <references/>
 __TOC__
 </StructureSection>
+[[Category: Large Structures]]
 [[Category: Babon, J J]]
 [[Category: Kershaw, N J]]

6c5x

From Proteopedia

Revision as of 08:54, 11 November 2020

Crystal Structure of SOCS1 in complex with ElonginB and ElonginC

Structural highlights

Function

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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