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.

1rst

From Proteopedia

(Difference between revisions)

Jump to: navigation, search

Revision as of 07:17, 8 March 2018

COMPLEX BETWEEN STREPTAVIDIN AND THE STREP-TAG PEPTIDE

Structural highlights

1rst is a 2 chain structure with sequence from As 4.1583. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

[SAV_STRAV] The biological function of streptavidin is not known. Forms a strong non-covalent specific complex with biotin (one molecule of biotin per subunit of streptavidin).

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

The Strep-tag is a selected nine-amino acid peptide (AWRHPQFGG) that displays intrinsic binding affinity towards streptavidin and has been used as an affinity tag for recombinant proteins. In order to elucidate the molecular mechanism underlying this type of artificial protein-peptide recognition, X-ray crystallographic analyses and binding measurements were carried out. The crystal structure of the complex between recombinant core streptavidin and the synthesized peptide was solved and refined at 1.7 A resolution (space group I4(1)22; unit cell dimensions a = b = 58.3 A, c = 176.9 A). The Strep-tag was bound at the same surface pocket where biotin, the natural ligand of streptavidin, gets complexed. The peptide backbone exhibited 3(10)-helical conformation, with eight of the residues involved in protein contacts. The C-terminal Gly-Gly moiety of the Strep-tag participated in a salt bridge to Arg84 of streptavidin with its free carboxylate group. This finding explained why the use of the Strep-tag in fusions with recombinant proteins was restricted to their carboxyl end. Employing a synthetic peptide spot assay, the variant Strep-tag II was screened, which did not have this limitation. The isomorphous crystal structure of its complex with streptavidin revealed that a glutamate side-chain provided the salt bridge in this case, with an otherwise almost unchanged mode of binding. Affinity constants between the peptides and streptavidin were measured by isothermal titration calorimetry. A value of 2.7 x 10(4) M-1 was determined for the Strep-tag peptide, and slightly tighter binding was seen when the Strep-tag was applied as part of a bacterially produced fusion protein. This affinity is significantly higher, compared with values previously reported for shorter streptavidin-binding peptides, and agrees well with the remarkable selectivity observed in recombinant protein purification applications.

Molecular interaction between the Strep-tag affinity peptide and its cognate target, streptavidin.,Schmidt TG, Koepke J, Frank R, Skerra A J Mol Biol. 1996 Feb 9;255(5):753-66. PMID:8636976^[1]

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

References

↑ Schmidt TG, Koepke J, Frank R, Skerra A. Molecular interaction between the Strep-tag affinity peptide and its cognate target, streptavidin. J Mol Biol. 1996 Feb 9;255(5):753-66. PMID:8636976 doi:10.1006/jmbi.1996.0061

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

Proteopedia Page Contributors and Editors (what is this?)

OCA

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

Categories: As 4 1583 | Koepke, J | Schmidt, T | Skerra, A | Signal protein

@@ Line 1: / Line 1: @@
 ==COMPLEX BETWEEN STREPTAVIDIN AND THE STREP-TAG PEPTIDE==
 <StructureSection load='1rst' size='340' side='right' caption='[[1rst]], [[Resolution|resolution]] 1.70&Aring;' scene=''>
 == Structural highlights ==
 <table><tr><td colspan='2'>[[1rst]] is a 2 chain structure with sequence from [http://en.wikipedia.org/wiki/As_4.1583 As 4.1583]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1RST OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1RST FirstGlance]. <br>
-</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=1rst FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rst OCA], [http://pdbe.org/1rst PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1rst RCSB], [http://www.ebi.ac.uk/pdbsum/1rst PDBsum]</span></td></tr>
+</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=1rst FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1rst OCA], [http://pdbe.org/1rst PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1rst RCSB], [http://www.ebi.ac.uk/pdbsum/1rst PDBsum], [http://prosat.h-its.org/prosat/prosatexe?pdbcode=1rst ProSAT]</span></td></tr>
 </table>
 == Function ==
@@ Line 11: / Line 12: @@
 Check<jmol>
   <jmolCheckbox>
-    <scriptWhenChecked>select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/rs/1rst_consurf.spt"</scriptWhenChecked>
+    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/rs/1rst_consurf.spt"</scriptWhenChecked>
     <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
     <text>to colour the structure by Evolutionary Conservation</text>

1rst

From Proteopedia

Revision as of 07:17, 8 March 2018

COMPLEX BETWEEN STREPTAVIDIN AND THE STREP-TAG PEPTIDE

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

Personal tools

Navigation

Search

Toolbox