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1f6r

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Revision as of 12:38, 10 September 2015

CRYSTAL STRUCTURE OF APO-BOVINE ALPHA-LACTALBUMIN

Structural highlights

1f6r is a 6 chain structure with sequence from Bovin. Full crystallographic information is available from OCA. For a guided tour on the structure components use FirstGlance.
Related:	1f6s, 1a4v, 1hfx, 1hfy, 1hfz, 1alc
Resources:	FirstGlance, OCA, PDBe, RCSB, PDBsum

Function

[LALBA_BOVIN] Regulatory subunit of lactose synthase, changes the substrate specificity of galactosyltransferase in the mammary gland making glucose a good acceptor substrate for this enzyme. This enables LS to synthesize lactose, the major carbohydrate component of milk. In other tissues, galactosyltransferase transfers galactose onto the N-acetylglucosamine of the oligosaccharide chains in glycoproteins.

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

High affinity binding of Ca(2+) to alpha-lactalbumin (LA) stabilizes the native structure and is required for the efficient generation of native protein with correct disulfide bonds from the reduced denatured state. A progressive increase in affinity of LA conformers for Ca(2+) as they develop increasingly native structures can account for the tendency of the apo form to assume a molten globule state and the large acceleration of folding by Ca(2+). To investigate the effect of calcium on structure of bovine LA, x-ray structures have been determined for crystals of the apo and holo forms at 2.2-A resolution. In both crystal forms, which were grown at high ionic strength, the protein is in a similar global native conformation consisting of alpha-helical and beta-subdomains separated by a cleft. Even though alternative cations and Ca(2+) liganding solvent molecules are absent, removal of Ca(2+) has only minor effects on the structure of the metal-binding site and a structural change was observed in the cleft on the opposite face of the molecule adjoining Tyr(103) of the helical lobe and Gln(54) of the beta-lobe. Changes include increased separation of the lobes, loss of a buried solvent molecule near the Ca(2+)-binding site, and the replacement of inter- and intra-lobe H-bonds of Tyr(103) by interactions with new immobilized water molecules. The more open cleft structure in the apo protein appears to be an effect of calcium binding transmitted via a change in orientation of helix H3 relative to the beta-lobe to the inter-lobe interface. Calcium is well known to promote the folding of LA. The results from the comparison of apo and holo structures of LA provide high resolution structural evidence that the acceleration of folding by Ca(2+) is mediated by an effect on interactions between the two subdomains.

Crystal structures of apo- and holo-bovine alpha-lactalbumin at 2. 2-A resolution reveal an effect of calcium on inter-lobe interactions.,Chrysina ED, Brew K, Acharya KR J Biol Chem. 2000 Nov 24;275(47):37021-9. PMID:10896943^[1]

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

References

↑ Chrysina ED, Brew K, Acharya KR. Crystal structures of apo- and holo-bovine alpha-lactalbumin at 2. 2-A resolution reveal an effect of calcium on inter-lobe interactions. J Biol Chem. 2000 Nov 24;275(47):37021-9. PMID:10896943 doi:10.1074/jbc.M004752200

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/1f6r"

@@ Line 2: / Line 2: @@
 <StructureSection load='1f6r' size='340' side='right' caption='[[1f6r]], [[Resolution|resolution]] 2.20&Aring;' scene=''>
 == Structural highlights ==
-<table><tr><td colspan='2'>[[1f6r]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F6R OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1F6R FirstGlance]. <br>
+<table><tr><td colspan='2'>[[1f6r]] is a 6 chain structure with sequence from [http://en.wikipedia.org/wiki/Bovin Bovin]. Full crystallographic information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1F6R OCA]. For a <b>guided tour on the structure components</b> use [http://oca.weizmann.ac.il/oca-docs/fgij/fg.htm?mol=1F6R FirstGlance]. <br>
 </td></tr><tr id='related'><td class="sblockLbl"><b>[[Related_structure|Related:]]</b></td><td class="sblockDat">[[1f6s|1f6s]], [[1a4v|1a4v]], [[1hfx|1hfx]], [[1hfy|1hfy]], [[1hfz|1hfz]], [[1alc|1alc]]</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=1f6r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f6r OCA], [http://www.rcsb.org/pdb/explore.do?structureId=1f6r RCSB], [http://www.ebi.ac.uk/pdbsum/1f6r 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=1f6r FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1f6r OCA], [http://pdbe.org/1f6r PDBe], [http://www.rcsb.org/pdb/explore.do?structureId=1f6r RCSB], [http://www.ebi.ac.uk/pdbsum/1f6r PDBsum]</span></td></tr>
 </table>
 == Function ==
@@ Line 26: / Line 26: @@
 From MEDLINE&reg;/PubMed&reg;, a database of the U.S. National Library of Medicine.<br>
 </div>
+<div class="pdbe-citations 1f6r" style="background-color:#fffaf0;"></div>
 ==See Also==
@@ Line 33: / Line 34: @@
 __TOC__
 </StructureSection>
-[[Category: Bos taurus]]
+[[Category: Bovin]]
 [[Category: Acharya, K R]]
 [[Category: Brew, K]]

1f6r

From Proteopedia

Revision as of 12:38, 10 September 2015

CRYSTAL STRUCTURE OF APO-BOVINE ALPHA-LACTALBUMIN

Structural highlights

Function

Evolutionary Conservation

Publication Abstract from PubMed

See Also

References

Contents

Proteopedia Page Contributors and Editors (what is this?)

Views

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