Structural stability of beta-lactoglobulin in the presence of kosmotropic salts. A kinetic and thermodynamic study.


Abstract

The thiol group of beta-lactoglobulin reacted very sluggishly with dithio-bis-nitro-benzoic acid as compared to that of glutathione at pH 6.85. The pKapp value of the thiol group of the protein was 9.35. In the presence of 3 M urea, the thiol group reacted completely with dithio-bis-nitrobenzoic acid at pH 6.85. Heating (from 50 degrees to 80 degrees) increased the exposure of the thiol by dissociating the dimer unit. From the pseudo-first order rate constants of heat-exposure of thiol, thermodynamic activation parameters, delta G++, delta H++, and delta S++, for the heat-dissociation of beta-lactoglobulin dimer were estimated to be 23,290 cal/mol, 31,160 cal/mol, and 22.9 e.u. (at 70 degrees), respectively. Addition of kosmotropic salts, chloride, tartrate, sulfate, phosphate, and citrate (0.2 M) decreased the heat-induced exposure of the thiol group (at 70 degrees), probably by decreasing the dissociation of the dimer at pH 6.85. The relative change in free energy of activation for the dissociation of the dimer, delta(delta G++dimer), in the presence of the salts was positive, suggesting that these additives increase the stability of the dimer against heat. These salts also increased the conformational stability of beta-lactoglobulin as revealed by an increase in -delta(delta G0conf) values in their presence. Both delta(delta G++dimer) and -delta(delta G0conf) values followed the order, chloride less than tartrate less than sulfate less than phosphate less than citrate. These salts seem to manifest their structure-stabilizing effect by increasing both inter- and intramolecular hydrophobic interactions via changes in structure of water. Study holds ProTherm entries: 10375, 10376, 10377, 10378, 10379, 10380 Extra Details: 10 mM EDTA added in the experiment. beta-lactoglobulin; hydrophobic interactions; salt effect;,structural stability; thermodynamic stability; thiol reactivity

Submission Details

ID: FGo3NjPE4

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:40 p.m.

Version: 1

Publication Details
Kella NK;Kinsella JE,Int. J. Pept. Protein Res. (1988) Structural stability of beta-lactoglobulin in the presence of kosmotropic salts. A kinetic and thermodynamic study. PMID:3209354
Additional Information

Structure view and single mutant data analysis

Study data

No weblogo for data of varying length.
Colors: D E R H K S T N Q A V I L M F Y W C G P
 

Data Distribution

Studies with similar sequences (approximate matches)

Correlation with other assays (exact sequence matches)


Relevant PDB Entries

Structure ID Release Date Resolution Structure Title
1CJ5 2000-04-26 BOVINE BETA-LACTOGLOBULIN A
1DV9 2000-02-09 STRUCTURAL CHANGES ACCOMPANYING PH-INDUCED DISSOCIATION OF THE B-LACTOGLOBULIN DIMER
4CK4 2014-10-08 1.12 Ovine beta-Lactoglobulin at Atomic Resolution
4TLJ 2014-06-18 1.17 Ultra-high resolution crystal structure of caprine Beta-lactoglobulin
4NLJ 2014-03-12 1.4 Crystal structure of sheep beta-lactoglobulin (space group P1)
4GNY 2013-02-13 1.64 Bovine beta-lactoglobulin complex with dodecyl sulfate
5NUK 2018-04-04 1.7 Engineered beta-lactoglobulin: variant I56F-L39A-M107F in complex with chlorpromazine (LG-FAF-CLP)
1BEB 1997-05-15 1.8 BOVINE BETA-LACTOGLOBULIN, LATTICE X
4KII 2013-09-04 1.85 Beta-lactoglobulin in complex with Cp*Rh(III)Cl N,N-di(pyridin-2-yl)dodecanamide
3UEV 2011-11-09 1.9 Bovine beta-lactoglobulin complex with myristic acid
4NLI 2014-03-12 1.9 Crystal structure of sheep beta-lactoglobulin (space group P3121)
3NQ3 2010-07-14 1.9 Bovine beta-lactoglobulin complex with capric acid
3NQ9 2010-07-14 1.9 Bovine beta-lactoglobulin complex with caprylic acid
4Y0S 2015-07-01 1.9 Goat beta-lactoglobulin complex with pramocaine (GLG-PRM)
6GHH 2018-06-20 1.9 Thermodynamic, Crystallographic and Computational Studies of Non Mammalian Fatty Acid Binding to Bovine b-Lactoglobulin
5NUN 2018-04-04 1.95 Engineered beta-lactoglobulin: variant F105L-L39A-M107F in complex with chlorpromazine (LG-LAF-CLP)
1B8E 2001-05-02 1.95 HIGH RESOLUTION CRYSTAL STRUCTURE OF THE BOVINE BETA-LACTOGLOBULIN (ISOFORMS A AND B) IN ORTHOROMBIC SPACE GROUP
5EEE 2016-11-09 1.95 Bovine lactoglobulin complex with decanol
1UZ2 2004-05-20 1.95 The Cys121Ser Mutant of Beta-Lactoglobulin
6QPD 2019-02-27 2.0 Engineered beta-lactoglobulin: variant I56F
5EED 2016-10-26 2.0 Ovine lactoglobulin complex with decanol
6GFS 2018-06-20 2.0 Thermodynamic, Crystallographic and Computational Studies of Non Mammalian Fatty Acid Binding to Bovine b-Lactoglobulin
6QI6 2019-01-30 2.0 Trigonal form of WT recombinant bovine beta-lactoglobulin
6FXB 2018-05-23 2.0 Bovine beta-lactoglobulin variant A at pH 4.0
1QG5 2001-04-21 2.0 HIGH RESOLUTION CRYSTAL STRUCTURE OF THE BOVINE BETA-LACTOGLOBULIN (ISOFORM A)
3UEW 2011-11-09 2.0 Bovine beta-lactoglobulin complex with palmitic acid
3KZA 2010-12-22 2.0 Crystal structure of Gyuba, a patched chimera of b-lactglobulin
4Y0Q 2015-07-01 2.0 Bovine beta-lactoglobulin complex with pramocaine crystallized from sodium citrate (BLG-PRM1)
6RWQ 2019-06-19 2.05 Engineered beta-lactoglobulin: variant F105L in complex with myristic acid
3UEU 2011-11-09 2.1 Bovine beta-lactoglobulin complex with lauric acid
4DQ4 2012-02-29 2.1 Bovine beta-lactoglobulin complex with linoleic acid
6GF9 2018-06-20 2.1 Thermodynamic, Crystallographic and Computational Studies of Non Mammalian Fatty Acid Binding to Bovine b-Lactoglobulin
6RWR 2019-06-19 2.1 Engineered beta-lactoglobulin: variant M107L in complex with myristic acid
2Q2M 2008-02-26 2.1 Beta-lactoglobulin (native)
6RWP 2019-06-19 2.1 Engineered beta-lactoglobulin: variant L58F in complex with myristic acid
4DQ3 2012-02-29 2.1 Bovine beta-lactoglobulin complex with oleic acid
6RYT 2019-06-26 2.1 Engineered beta-lactoglobulin: variant M107L
3UEX 2011-11-09 2.1 Bovine beta-lactoglobulin complex with stearic acid
6RYS 2019-06-26 2.15 Engineered beta-lactoglobulin: variant F105L
4IB7 2013-06-26 2.2 Bovine beta-lactoglobulin (isoform A) in complex with dodecyltrimethylammonium (DTAC)
4Y0P 2015-07-01 2.2 Bovine beta-lactoglobulin complex with tetracaine (BLG-TET)
6QPE 2019-02-27 2.2 Engineered beta-lactoglobulin: variant L58F
3NPO 2010-07-14 2.2 Bovine beta lactoglobulin unliganded form
4IB9 2013-06-26 2.2 Bovine beta-lactoglobulin (isoform B) in complex with dodecyltrimethylammonium (DTAC)
4IB6 2013-06-26 2.2 Bovine beta-lactoglobulin (isoform A) in complex with lauric acid (C12)
1BSQ 1998-09-02 2.22 STRUCTURAL AND FUNCTIONAL CONSEQUENCES OF POINT MUTATIONS OF VARIANTS A AND B OF BOVINE BETA-LACTOGLOBULIN
1BSO 1999-09-02 2.23 12-BROMODODECANOIC ACID BINDS INSIDE THE CALYX OF BOVINE BETA-LACTOGLOBULIN
1BSY 1999-01-27 2.24 STRUCTURAL BASIS OF THE TANFORD TRANSITION OF BOVINE BETA-LACTOGLOBULIN FROM CRYSTAL STRUCTURES AT THREE PH VALUES; PH 7.1
4Y0R 2015-07-01 2.3 Bovine beta-lactoglobulin complex with pramocaine crystallized from ammonium sulphate (BLG-PRM2)
6GE7 2018-06-20 2.3 Thermodynamic, Crystallographic and Computational Studies of Non Mammalian Fatty Acid Binding to Bovine b-Lactoglobulin
6NKQ 2019-01-23 2.3 The structure of bovine beta-lactoglobulin in novel crystals grown at pH 3.8
4IBA 2013-06-26 2.3 Bovine beta-lactoglobulin (isoform B) in complex with dodecyl sulphate (SDS)
4OMX 2014-11-19 2.3 Crystal structure of goat beta-lactoglobulin (trigonal form)
4IB8 2013-06-26 2.3 Bovine beta-lactoglobulin (isoform A) in complex with dodecyl sulphate (SDS)
5NUM 2018-04-04 2.3 Engineered beta-lactoglobulin: variant F105L-L39A in complex with chlorpromazine (LG-LA-CLP)
4OMW 2014-11-19 2.3 Crystal structure of goat beta-lactoglobulin (orthorhombic form)
1GX9 2002-06-13 2.34 BOVINE BETA-LACTOGLOBULIN COMPLEXED WITH RETINOIC ACID, TRIGONAL LATTICE Z
1GXA 2002-06-13 2.35 BOVINE BETA-LACTOGLOBULIN COMPLEXED WITH RETINOL AND PALMITIC ACID, TRIGONAL LATTICE Z
3PH5 2011-09-21 2.4 Bovine beta lactoglobulin crystallized through ligandation of yttrium cations
5HTE 2016-07-20 2.4 Recombinant bovine beta-lactoglobulin variant L1A/I2S (sBlgB#2)
4LZU 2014-08-06 2.4 Bovine beta-lactoglobulin crystallized in the presence of 2 mM zinc chloride
2GJ5 2007-10-02 2.4 Crystal structure of a secondary vitamin D3 binding site of milk beta-lactoglobulin
1GX8 2002-06-13 2.4 BOVINE BETA-LACTOGLOBULIN COMPLEXED WITH RETINOL, TRIGONAL LATTICE Z
4LZV 2014-08-06 2.44 Bovine beta-lactoglobulin crystallized in the presence of 20 mM zinc chloride
2BLG 1999-01-27 2.46 STRUCTURAL BASIS OF THE TANFORD TRANSITION OF BOVINE BETA-LACTOGLOBULIN FROM CRYSTAL STRUCTURES AT THREE PH VALUES; PH 8.2
5LKF 2016-08-17 2.5 Bovine beta-lactoglobulin complex with myristic acid at high pressure (0.55 GPa)
5HTD 2016-07-20 2.5 Recombinant bovine beta-lactoglobulin variant L1A/I2S with endogenous ligand (sBlgB#1)
2Q39 2008-02-26 2.5 Beta-lactoglobulin (low humidity)
5K06 2016-07-20 2.5 Recombinant bovine beta-lactoglobulin with uncleaved N-terminal methionine (rBlgB)
1B0O 1999-02-02 2.5 BOVINE BETA-LACTOGLOBULIN COMPLEXED WITH PALMITATE, LATTICE Z
6QI7 2019-01-30 2.5 Engineered beta-lactoglobulin: variant L39Y in complex with endogenous ligand
3PH6 2011-09-21 2.53 Bovine beta lactoglobulin crytsallized through ligandation of yttrium
3BLG 1999-01-27 2.56 STRUCTURAL BASIS OF THE TANFORD TRANSITION OF BOVINE BETA-LACTOGLOBULIN FROM CRYSTAL STRUCTURES AT THREE PH VALUES; PH 6.2
5NUJ 2018-04-04 2.6 Engineered beta-lactoglobulin: variant I56F-L39A in complex with chlorpromazine (LG-FA-CLP)
5Y5C 2018-08-08 2.61 Crystal structure of dha bind to bovine beta-lactoglobulin
5LKE 2016-08-10 2.8 Bovine beta-lactoglobulin complex with myristic acid, ambient pressure
2R56 2007-11-13 2.8 Crystal Structure of a Recombinant IgE Fab Fragment in Complex with Bovine Beta-Lactoglobulin Allergen
5IO5 2016-03-16 2.85 Unliganded form of bovine beta-lactoglobulin, ambient pressure
5IO7 2016-03-16 2.85 Bovine beta-lactoglobulin complex with dodecane at high pressure (0.43 GPa)
2Q2P 2008-02-26 2.96 Beta-lactoglobulin (reverse native)
2AKQ 2005-08-16 3.0 The structure of bovine B-lactoglobulin A in crystals grown at very low ionic strength

Relevant UniProtKB Entries

Percent Identity Matching Chains Protein Accession Entry Name
95.7 Beta-lactoglobulin P67975 LACB_OVIMU
95.7 Beta-lactoglobulin P67976 LACB_SHEEP
96.3 Beta-lactoglobulin P02756 LACB_CAPHI
98.8 Beta-lactoglobulin P02755 LACB_BUBBU
100.0 Beta-lactoglobulin P02754 LACB_BOVIN