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.

4u7e

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 12:06, 6 November 2017

The crystal structure of the complex of LIP5 NTD and IST1 MIM

Structural highlights

4u7e is a 2 chain structure with sequence from Human. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	4u7i, 4u7y
Gene:	VTA1, C6orf55, HSPC228, My012 (HUMAN), IST1, KIAA0174 (HUMAN)
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[VTA1_HUMAN] Involved in the endosomal multivesicular bodies (MVB) pathway. MVBs contain intraluminal vesicles (ILVs) that are generated by invagination and scission from the limiting membrane of the endosome and mostly are delivered to lysosomes enabling degradation of membrane proteins, such as stimulated growth factor receptors, lysosomal enzymes and lipids. Thought to be a cofactor of VPS4A/B, which catalyzes disassembles membrane-associated ESCRT-III assemblies. Involved in the sorting and down-regulation of EGFR (By similarity). Involved in HIV-1 budding.^[1] [IST1_HUMAN] Proposed to be involved in specific functions of the ESCRT machinery. Is required for efficient abscission during cytokinesis, but not for HIV-1 budding. The involvement in the MVB pathway is not established. Involved in recruiting VPS4A and/or VPS4B to the midbody of dividing cells.^[2] ^[3]

Publication Abstract from PubMed

The endosomal sorting complex required for transport (ESCRT) machinery is responsible for membrane remodeling in a number of biological processes including multi-vesicular body biogenesis, cytokinesis, and enveloped virus budding. In mammalian cells, efficient abscission during cytokinesis requires proper function of the ESCRT-III protein IST1, which binds to the Microtubule Interacting and Trafficking (MIT) domains of VPS4, LIP5, and Spartin via its C-terminal MIT-Interacting Motif (MIM). Here, we studied the molecular interactions between IST1 and the three MIT domain-containing proteins to understand the structural basis that governs pairwise MIT-MIM interaction. Crystal structures of the three molecular complexes revealed that IST1 binds to the MIT domains of VPS4, LIP5 and Spartin using two different mechanisms (MIM1 mode versus MIM3 mode). Structural comparison revealed that structural features in both MIT and MIM contribute to determine the specific binding mechanism. Within the IST1 MIM sequence, two phenylalanine residues were shown to be important in discriminating MIM1 versus MIM3 binding. These observations enabled us to deduce a preliminary binding code, which we applied to provide CHMP2A, a protein that normally only binds the MIT domain in the MIM1 mode, the additional ability to bind the MIT domain of Spartin in the MIM3 mode.

Distinct Mechanisms of Recognizing Endosomal Sorting Complex Required for Transport (ESCRT)-III Protein IST1 by Different Microtubule Interacting and Trafficking (MIT) Domains.,Guo EZ, Xu Z J Biol Chem. 2015 Feb 5. pii: jbc.M114.607903. PMID:25657007^[4]

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

References

↑ Ward DM, Vaughn MB, Shiflett SL, White PL, Pollock AL, Hill J, Schnegelberger R, Sundquist WI, Kaplan J. The role of LIP5 and CHMP5 in multivesicular body formation and HIV-1 budding in mammalian cells. J Biol Chem. 2005 Mar 18;280(11):10548-55. Epub 2005 Jan 11. PMID:15644320 doi:http://dx.doi.org/M413734200
↑ Bajorek M, Morita E, Skalicky JJ, Morham SG, Babst M, Sundquist WI. Biochemical analyses of human IST1 and its function in cytokinesis. Mol Biol Cell. 2009 Mar;20(5):1360-73. doi: 10.1091/mbc.E08-05-0475. Epub 2009, Jan 7. PMID:19129479 doi:http://dx.doi.org/10.1091/mbc.E08-05-0475
↑ Agromayor M, Carlton JG, Phelan JP, Matthews DR, Carlin LM, Ameer-Beg S, Bowers K, Martin-Serrano J. Essential role of hIST1 in cytokinesis. Mol Biol Cell. 2009 Mar;20(5):1374-87. doi: 10.1091/mbc.E08-05-0474. Epub 2009, Jan 7. PMID:19129480 doi:http://dx.doi.org/10.1091/mbc.E08-05-0474
↑ Guo EZ, Xu Z. Distinct Mechanisms of Recognizing Endosomal Sorting Complex Required for Transport (ESCRT)-III Protein IST1 by Different Microtubule Interacting and Trafficking (MIT) Domains. J Biol Chem. 2015 Feb 5. pii: jbc.M114.607903. PMID:25657007 doi:http://dx.doi.org/10.1074/jbc.M114.607903

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

Retrieved from "http://52.214.119.220/wiki/index.php/4u7e"

@@ Line 3: / Line 3: @@
 <StructureSection load='4u7e' size='340' side='right' caption='[[4u7e]], [[Resolution|resolution]] 1.60&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[4u7e]] is a 2 chain structure. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4U7E OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4U7E FirstGlance]. <br>
+<table><tr><td colspan='2'>[[4u7e]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/Human Human]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4U7E OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=4U7E FirstGlance]. <br>
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[4u7i|4u7i]], [[4u7y|4u7y]]</td></tr>
+<tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">VTA1, C6orf55, HSPC228, My012 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN]), IST1, KIAA0174 ([http://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</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=4u7e FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4u7e OCA], [http://pdbe.org/4u7e PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=4u7e RCSB], [http://www.ebi.ac.uk/pdbsum/4u7e PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=4u7e ProSAT]</span></td></tr>
 </table>
@@ Line 22: / Line 23: @@
 __TOC__
 </StructureSection>
+[[Category: Human]]
 [[Category: Guo, E Z]]
 [[Category: Xu, Z]]
 [[Category: Complex]]
 [[Category: Mim1]]
+[[Category: Protein transport]]

4u7e

From Proteopedia

Revision as of 12:06, 6 November 2017

The crystal structure of the complex of LIP5 NTD and IST1 MIM

Structural highlights

Function

Publication Abstract from PubMed

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox