1dv9: Difference between revisions

From Proteopedia
Jump to navigation Jump to search
← Older edit
No edit summary
No edit summary
 
(16 intermediate revisions by the same user not shown)
Line 1: Line 1:
[[Image:1dv9.gif|left|200px]]<br /><applet load="1dv9" size="350" color="white" frame="true" align="right" spinBox="true"
caption="1dv9" />
'''STRUCTURAL CHANGES ACCOMPANYING PH-INDUCED DISSOCIATION OF THE B-LACTOGLOBULIN DIMER'''<br />


==Overview==
==STRUCTURAL CHANGES ACCOMPANYING PH-INDUCED DISSOCIATION OF THE B-LACTOGLOBULIN DIMER==
We have used NMR spectroscopy to determine the three-dimensional (3D) structure, and to characterize the backbone dynamics, of a recombinant version of bovine beta-lactoglobulin (variant A) at pH 2. 6, where the protein is a monomer. The structure of this low-pH form of beta-lactoglobulin is very similar to that of a subunit within the dimer at pH 6.2. The root-mean-square deviation from the pH 6.2 (crystal) structure, calculated for backbone atoms of residues 6-160, is approximately 1.3 A. Differences arise from the orientation, with respect to the calyx, of the A-B and C-D loops, and of the flanking three-turn alpha-helix. The hydrophobic cavity within the calyx is retained at low pH. The E-F loop (residues 85-90), which moves to occlude the opening of the cavity over the pH range 7.2-6.2, is in the "closed" position at pH 2.6, and the side chain of Glu89 is buried. We also carried out measurements of (15)N T(1)s and T(2)s and (1)H-(15)N heteronuclear NOEs at pH 2.6 and 37 degrees C. Although the residues of the E-F loop (residues 86-89) have the highest crystallographic B-factors, the conformation of this loop is reasonably well defined by the NMR data, and its backbone is not especially mobile on the pico- to nanosecond time scale. Several residues (Ser21, Lys60, Ala67, Leu87, and Glu112) exhibit large ratios of T(1) to T(2), consistent with conformational exchange on a micro- to millisecond time scale. The positions of these residues in the 3D structure of beta-lactoglobulin are consistent with a role in modulating access to the hydrophobic cavity.
<StructureSection load='1dv9' size='340' side='right'caption='[[1dv9]]' scene=''>
== Structural highlights ==
<table><tr><td colspan='2'>[[1dv9]] is a 1 chain structure with sequence from [https://en.wikipedia.org/wiki/Bos_taurus Bos taurus]. Full experimental information is available from [http://oca.weizmann.ac.il/oca-bin/ocashort?id=1DV9 OCA]. For a <b>guided tour on the structure components</b> use [https://proteopedia.org/fgij/fg.htm?mol=1DV9 FirstGlance]. <br>
</td></tr><tr id='method'><td class="sblockLbl"><b>[[Empirical_models|Method:]]</b></td><td class="sblockDat" id="methodDat">Solution NMR</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=1dv9 FirstGlance], [http://oca.weizmann.ac.il/oca-bin/ocaids?id=1dv9 OCA], [https://pdbe.org/1dv9 PDBe], [https://www.rcsb.org/pdb/explore.do?structureId=1dv9 RCSB], [https://www.ebi.ac.uk/pdbsum/1dv9 PDBsum], [https://prosat.h-its.org/prosat/prosatexe?pdbcode=1dv9 ProSAT]</span></td></tr>
</table>
== Function ==
[https://www.uniprot.org/uniprot/LACB_BOVIN LACB_BOVIN] Primary component of whey, it binds retinol and is probably involved in the transport of that molecule.
== Evolutionary Conservation ==
[[Image:Consurf_key_small.gif|200px|right]]
Check<jmol>
  <jmolCheckbox>
    <scriptWhenChecked>; select protein; define ~consurf_to_do selected; consurf_initial_scene = true; script "/wiki/ConSurf/dv/1dv9_consurf.spt"</scriptWhenChecked>
    <scriptWhenUnchecked>script /wiki/extensions/Proteopedia/spt/initialview01.spt</scriptWhenUnchecked>
    <text>to colour the structure by Evolutionary Conservation</text>
  </jmolCheckbox>
</jmol>, as determined by [http://consurfdb.tau.ac.il/ ConSurfDB]. You may read the [[Conservation%2C_Evolutionary|explanation]] of the method and the full data available from [http://bental.tau.ac.il/new_ConSurfDB/main_output.php?pdb_ID=1dv9 ConSurf].
<div style="clear:both"></div>


==About this Structure==
==See Also==
1DV9 is a [http://en.wikipedia.org/wiki/Single_protein Single protein] structure of 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=1DV9 OCA].
*[[Beta-lactoglobulin 3D structures|Beta-lactoglobulin 3D structures]]
 
__TOC__
==Reference==
</StructureSection>
Structural changes accompanying pH-induced dissociation of the beta-lactoglobulin dimer., Uhrinova S, Smith MH, Jameson GB, Uhrin D, Sawyer L, Barlow PN, Biochemistry. 2000 Apr 4;39(13):3565-74. PMID:[http://ispc.weizmann.ac.il//pmbin/getpm?pmid=10736155 10736155]
[[Category: Bos taurus]]
[[Category: Bos taurus]]
[[Category: Single protein]]
[[Category: Large Structures]]
[[Category: Barlow, P N.]]
[[Category: Barlow PN]]
[[Category: Jameson, G B.]]
[[Category: Jameson GB]]
[[Category: Sawyer, L.]]
[[Category: Sawyer L]]
[[Category: Smith, M H.]]
[[Category: Smith MH]]
[[Category: Uhrin, D.]]
[[Category: Uhrin D]]
[[Category: Uhrinova, S.]]
[[Category: Uhrinova S]]
[[Category: beta-barrel]]
[[Category: beta-lactoglobulin]]
[[Category: low ph structure]]
[[Category: triple resonance experiments]]
 
''Page seeded by [http://oca.weizmann.ac.il/oca OCA ] on Thu Feb 21 12:20:48 2008''

Latest revision as of 12:54, 20 March 2024

STRUCTURAL CHANGES ACCOMPANYING PH-INDUCED DISSOCIATION OF THE B-LACTOGLOBULIN DIMERSTRUCTURAL CHANGES ACCOMPANYING PH-INDUCED DISSOCIATION OF THE B-LACTOGLOBULIN DIMER

Structural highlights

1dv9 is a 1 chain structure with sequence from Bos taurus. Full experimental information is available from OCA. For a guided tour on the structure components use FirstGlance.
Method:Solution NMR
Resources:FirstGlance, OCA, PDBe, RCSB, PDBsum, ProSAT

Function

LACB_BOVIN Primary component of whey, it binds retinol and is probably involved in the transport of that molecule.

Evolutionary Conservation

Check, as determined by ConSurfDB. You may read the explanation of the method and the full data available from ConSurf.

See Also

Drag the structure with the mouse to rotate

Proteopedia Page Contributors and Editors (what is this?)Proteopedia Page Contributors and Editors (what is this?)

OCA
Retrieved from "https://proteopedia.openfox.io/wiki/index.php?title=1dv9&oldid=4107469"