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4caa

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CLEAVED ANTICHYMOTRYPSIN T345R

Structural highlights

4caa is a 2 chain structure with sequence from Homo sapiens. This structure supersedes the now removed PDB entry 1ct3. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:	X-ray diffraction, Resolution 2.9Å
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

AACT_HUMAN Although its physiological function is unclear, it can inhibit neutrophil cathepsin G and mast cell chymase, both of which can convert angiotensin-1 to the active angiotensin-2.^[1]

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

Expressed in a kinetically trapped folding state, a serpin couples the thermodynamic driving force of a massive beta-sheet rearrangement to the inhibition of a target protease. Hence, the serpin-protease interaction is the premier example of a "spring-loaded" protein-protein interaction. Amino acid substitutions in the hinge region of a serpin reactive loop can weaken the molecular spring, which converts the serpin from an inhibitor into a substrate. To probe the molecular basis of this conversion, we report the crystal structure of A349R antichymotrypsin in the reactive loop cleaved state at 2.1 A resolution. This amino acid substitution does not block the beta-sheet rearrangement despite the burial of R349 in the hydrophobic core of the cleaved serpin along with a salt-linked acetate ion. The inhibitory activity of this serpin variant is not obliterated; remarkably, its inhibitory properties are anion-dependent due to the creation of an anion-binding cavity in the cleaved serpin.

Engineering an anion-binding cavity in antichymotrypsin modulates the "spring-loaded" serpin-protease interaction.,Lukacs CM, Rubin H, Christianson DW Biochemistry. 1998 Mar 10;37(10):3297-304. PMID:9521649^[2]

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

References

↑ Rubin H, Wang ZM, Nickbarg EB, McLarney S, Naidoo N, Schoenberger OL, Johnson JL, Cooperman BS. Cloning, expression, purification, and biological activity of recombinant native and variant human alpha 1-antichymotrypsins. J Biol Chem. 1990 Jan 15;265(2):1199-207. PMID:2404007
↑ Lukacs CM, Rubin H, Christianson DW. Engineering an anion-binding cavity in antichymotrypsin modulates the "spring-loaded" serpin-protease interaction. Biochemistry. 1998 Mar 10;37(10):3297-304. PMID:9521649 doi:10.1021/bi972359e

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/4caa"

Categories: Homo sapiens | Large Structures | Christianson DW | Lukacs CM

@@ Line 3: / Line 3: @@
 <StructureSection load='4caa' size='340' side='right'caption='[[4caa]], [[Resolution|resolution]] 2.90&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[4caa]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Human Human]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1ct3 1ct3]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CAA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4CAA FirstGlance]. <br>
+<table><tr><td colspan='2'>[[4caa]] is a 2 chain structure with sequence from [https://en.wikipedia.org/wiki/Homo_sapiens Homo sapiens]. This structure supersedes the now removed PDB entry [http://oca.weizmann.ac.il/oca-bin/send-pdb?obs=1&id=1ct3 1ct3]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=4CAA OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=4CAA FirstGlance]. <br>
-</td></tr><tr id='gene'><td class="sblockLbl"><b>[[Gene|Gene:]]</b></td><td class="sblockDat">ACT ([https://www.ncbi.nlm.nih.gov/Taxonomy/Browser/wwwtax.cgi?mode=Info&srchmode=5&id=9606 HUMAN])</td></tr>
+</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">X-ray diffraction, [[Resolution|Resolution]] 2.9&#8491;</td></tr>
 <tr id='resources'><td class="sblockLbl"><b>Resources:</b></td><td class="sblockDat"><span class='plainlinks'>[https://proteopedia.org/fgij/fg.htm?mol=4caa FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=4caa OCA], [https://pdbe.org/4caa PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=4caa RCSB], [https://www.ebi.ac.uk/pdbsum/4caa PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=4caa ProSAT]</span></td></tr>
 </table>
 == Function ==
-[[https://www.uniprot.org/uniprot/AACT_HUMAN AACT_HUMAN]] Although its physiological function is unclear, it can inhibit neutrophil cathepsin G and mast cell chymase, both of which can convert angiotensin-1 to the active angiotensin-2.<ref>PMID:2404007</ref>
+[https://www.uniprot.org/uniprot/AACT_HUMAN AACT_HUMAN] Although its physiological function is unclear, it can inhibit neutrophil cathepsin G and mast cell chymase, both of which can convert angiotensin-1 to the active angiotensin-2.<ref>PMID:2404007</ref>
 == Evolutionary Conservation ==
 [[Image:Consurf_key_small.gif|200px|right]]
@@ Line 35: / Line 35: @@
 __TOC__
 </StructureSection>
-[[Category: Human]]
+[[Category: Homo sapiens]]
 [[Category: Large Structures]]
-[[Category: Christianson, D W]]
+[[Category: Christianson DW]]
-[[Category: Lukacs, C M]]
+[[Category: Lukacs CM]]
-[[Category: Antichymotrypsin]]
-[[Category: Serine protease inhibitor]]
-[[Category: Serpin]]

4caa

From Proteopedia

Current revision

CLEAVED ANTICHYMOTRYPSIN T345R

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

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