Large increases in general stability for subtilisin BPN' through incremental changes in the free energy of unfolding.


Abstract

Six individual amino acid substitutions at separate positions in the tertiary structure of subtilisin BPN' (EC 3.4.21.14) were found to increase the stability of this enzyme, as judged by differential scanning calorimetry and decreased rates of thermal inactivation. These stabilizing changes, N218S, G169A, Y217K, M50F, Q206C, and N76D, were discovered through the use of five different investigative approaches: (1) random mutagenesis; (2) design of buried hydrophobic side groups; (3) design of electrostatic interactions at Ca2+ binding sites; (4) sequence homology consensus; and (5) serendipity. Individually, the six amino acid substitutions increase the delta G of unfolding between 0.3 and 1.3 kcal/mol at 58.5 degrees C. The combination of these six individual stabilizing mutations together into one subtilisin BPN' molecule was found to result in approximately independent and additive increases in the delta G of unfolding to give a net increase of 3.8 kcal/mol (58.5 degrees C). Thermodynamic stability was also shown to be related to resistance to irreversible inactivation, which included elevated temperatures (65 degrees C) or extreme alkalinity (pH 12.0). Under these denaturing conditions, the rate of inactivation of the combination variant is approximately 300 times slower than that of the wild-type subtilisin BPN'. A comparison of the 1.8-A-resolution crystal structures of mutant and wild-type enzymes revealed only independent and localized structural changes around the site of the amino acid side group substitutions.(ABSTRACT TRUNCATED AT 250 WORDS) Study holds ProTherm entries: 2525, 2526, 2527, 2528, 2529, 2530, 2531, 14027, 14028, 14029, 14030, 14031, 14032 Extra Details: additive : EDTA(10 mM), subtilisin BPN'; amino acid substitutions; hydrophobic; structural changes;,thermodynamic stability ; electrostatic interactions

Submission Details

ID: dtvShhFm

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:19 p.m.

Version: 1

Publication Details
Pantoliano MW;Whitlow M;Wood JF;Dodd SW;Hardman KD;Rollence ML;Bryan PN,Biochemistry (1989) Large increases in general stability for subtilisin BPN' through incremental changes in the free energy of unfolding. PMID:2684274
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
1TO2 2004-11-09 1.3 crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 M59K, in pH 9 cryosoak
1TM5 2004-11-09 1.45 crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 M59A mutant
1V5I 2005-03-08 1.5 Crystal structure of serine protease inhibitor POIA1 in complex with subtilisin BPN'
1LW6 2002-08-21 1.5 Crystal Structure of the Complex of Subtilisin BPN' with Chymotrypsin Inhibitor 2 at 1.5 Angstrom Resolution
1Y34 2005-05-17 1.55 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 E60A mutant
1Y1K 2005-05-17 1.56 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 T58A mutant
1TM3 2004-11-09 1.57 crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 M59k mutant
1TM7 2004-11-09 1.59 crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 M59Y mutant
1Y4A 2005-05-17 1.6 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 M59R/E60S mutant
1SUP 1995-11-14 1.6 SUBTILISIN BPN' AT 1.6 ANGSTROMS RESOLUTION: ANALYSIS OF DISCRETE DISORDER AND COMPARISON OF CRYSTAL FORMS
1TMG 2004-11-09 1.67 crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 M59F mutant
1TO1 2004-11-09 1.68 crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 Y61A mutant
1Y3C 2005-05-17 1.69 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 R62A mutant
1TM1 2004-11-09 1.7 CRYSTAL STRUCTURE OF THE COMPLEX OF SUBTILISIN BPN' WITH CHYMOTRYPSIN INHIBITOR 2
1S01 1990-10-15 1.7 LARGE INCREASES IN GENERAL STABILITY FOR SUBTILISIN BPN(PRIME) THROUGH INCREMENTAL CHANGES IN THE FREE ENERGY OF UNFOLDING
3F49 2008-12-16 1.7 Anion-triggered Engineered Subtilisin SUBT_BACAM
1TM4 2004-11-09 1.7 crystal structure of the complex of subtilsin BPN'with chymotrypsin inhibitor 2 M59G mutant
3CNQ 2008-05-06 1.71 Prosubtilisin Substrate Complex of Subtilisin SUBT_BACAM
1Y3F 2005-05-17 1.72 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 F69A mutant
1SUB 1994-01-31 1.75 CALCIUM-INDEPENDENT SUBTILISIN BY DESIGN
1SUC 1994-01-31 1.8 CALCIUM-INDEPENDENT SUBTILISIN BY DESIGN
1Y33 2005-05-17 1.8 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 T58P mutant
1AU9 1997-12-31 1.8 SUBTILISIN BPN' MUTANT 8324 IN CITRATE
1SUE 1998-10-14 1.8 SUBTILISIN BPN' FROM BACILLUS AMYLOLIQUEFACIENS, MUTANT
2ST1 1991-07-15 1.8 THE THREE-DIMENSIONAL STRUCTURE OF BACILLUS AMYLOLIQUEFACIENS SUBTILISIN AT 1.8 ANGSTROMS AND AN ANALYSIS OF THE STRUCTURAL CONSEQUENCES OF PEROXIDE INACTIVATION
1A2Q 1998-04-29 1.8 SUBTILISIN BPN' MUTANT 7186
3BGO 2008-06-03 1.8 Azide complex of Engineered Subtilisin SUBT_BACAM
3SIC 1994-01-31 1.8 MOLECULAR RECOGNITION AT THE ACTIVE SITE OF SUBTILISIN BPN': CRYSTALLOGRAPHIC STUDIES USING GENETICALLY ENGINEERED PROTEINACEOUS INHIBITOR SSI (STREPTOMYCES SUBTILISIN INHIBITOR)
1AQN 1998-01-14 1.8 SUBTILISIN MUTANT 8324
1Y3D 2005-05-17 1.8 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 R67A mutant
1YJB 1996-07-11 1.8 SUBTILISIN BPN' 8397+1 (E.C. 3.4.21.14) (MUTANT WITH MET 50 REPLACED BY PHE, ASN 76 REPLACED BY ASP, GLY 169 REPLACED BY ALA, GLN 206 REPLACED BY CYS, ASN 218 REPLACED BY SER AND LYS 256 REPLACED BY TYR) (M50F, N76D, G169A, Q206C, N218S, AND K256Y) IN 35% DIMETHYLFORMAMIDE
2SIC 1993-04-15 1.8 REFINED CRYSTAL STRUCTURE OF THE COMPLEX OF SUBTILISIN BPN' AND STREPTOMYCES SUBTILISIN INHIBITOR AT 1.8 ANGSTROMS RESOLUTION
1Y3B 2005-05-17 1.8 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 E60S mutant
1AK9 1997-11-12 1.8 SUBTILISIN MUTANT 8321
1GNS 2002-06-27 1.8 SUBTILISIN BPN'
1SBH 1995-12-07 1.8 SUBTILISIN BPN' 8397+1 (E.C. 3.4.21.14) MUTANT (M50F, N76D, G169A, Q206C, N218S, K256Y)
1YJC 1996-07-11 1.8 SUBTILISIN BPN' 8397+1 (E.C. 3.4.21.14) (MUTANT WITH MET 50 REPLACED BY PHE, ASN 76 REPLACED BY ASP, GLY 169 REPLACED BY ALA, GLN 206 REPLACED BY CYS, ASN 218 REPLACED BY SER AND LYS 256 REPLACED BY TYR) (M50F, N76D, G169A, Q206C, N218S, AND K256Y) IN 50% DIMETHYLFORMAMIDE
1YJA 1996-07-11 1.8 SUBTILISIN BPN' 8397+1 (E.C. 3.4.21.14) (MUTANT WITH MET 50 REPLACED BY PHE, ASN 76 REPLACED BY ASP, GLY 169 REPLACED BY ALA, GLN 206 REPLACED BY CYS, ASN 218 REPLACED BY SER AND LYS 256 REPLACED BY TYR) (M50F, N76D, G169A, Q206C, N218S, AND K256Y) IN 20% DIMETHYLFORMAMIDE
1Y48 2005-05-17 1.84 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 R65A mutant
1GNV 2002-06-24 1.9 CALCIUM INDEPENDENT SUBTILISIN BPN' MUTANT
1S02 1992-01-15 1.9 EFFECTS OF ENGINEERED SALT BRIDGES ON THE STABILITY OF SUBTILISIN BPN'
1SUD 1994-01-31 1.9 CALCIUM-INDEPENDENT SUBTILISIN BY DESIGN
3CO0 2008-10-14 1.93 Substrate Complex of Fluoride-sensitive Engineered Subtilisin SUBT_BACAM
1DUI 2000-01-28 2.0 Subtilisin BPN' from Bacillus amyloliquefaciens, crystal growth mutant
1SPB 1995-10-15 2.0 SUBTILISIN BPN' PROSEGMENT (77 RESIDUES) COMPLEXED WITH A MUTANT SUBTILISIN BPN' (266 RESIDUES). CRYSTAL PH 4.6. CRYSTALLIZATION TEMPERATURE 20 C DIFFRACTION TEMPERATURE-160 C
1Y4D 2005-05-17 2.0 Crystal structure of the complex of subtilisin BPN' with chymotrypsin inhibitor 2 M59R/E60S mutant
1ST2 1991-07-15 2.0 THE THREE-DIMENSIONAL STRUCTURE OF BACILLUS AMYLOLIQUEFACIENS SUBTILISIN AT 1.8 ANGSTROMS AND AN ANALYSIS OF THE STRUCTURAL CONSEQUENCES OF PEROXIDE INACTIVATION
1SBN 1994-01-31 2.1 REFINED CRYSTAL STRUCTURES OF SUBTILISIN NOVO IN COMPLEX WITH WILD-TYPE AND TWO MUTANT EGLINS. COMPARISON WITH OTHER SERINE PROTEINASE INHIBITOR COMPLEXES
2SNI 1988-09-07 2.1 STRUCTURAL COMPARISON OF TWO SERINE PROTEINASE-PROTEIN INHIBITOR COMPLEXES. EGLIN-C-SUBTILISIN CARLSBERG AND CI-2-SUBTILISIN NOVO
1SUA 1998-01-14 2.1 SUBTILISIN BPN'
1SBI 1995-12-07 2.2 SUBTILISIN BPN' 8397 (E.C. 3.4.21.14) MUTANT (M50F, N76D, G169A, Q206C, N218S)
5SIC 1994-01-31 2.2 MOLECULAR RECOGNITION AT THE ACTIVE SITE OF SUBTILISIN BPN': CRYSTALLOGRAPHIC STUDIES USING GENETICALLY ENGINEERED PROTEINACEOUS INHIBITOR SSI (STREPTOMYCES SUBTILISIN INHIBITOR)
5OX2 2018-01-10 2.24 Crystal structure of thymoligase, a substrate-tailored peptiligase variant
1UBN 1999-06-08 2.4 SELENOSUBTILISIN BPN
1SIB 1993-10-31 2.4 REFINED CRYSTAL STRUCTURES OF SUBTILISIN NOVO IN COMPLEX WITH WILD-TYPE AND TWO MUTANT EGLINS. COMPARISON WITH OTHER SERINE PROTEINASE INHIBITOR COMPLEXES
1SBT 1977-01-06 2.5 ATOMIC COORDINATES FOR SUBTILISIN BPN (OR NOVO)
2SBT 1976-10-06 2.8 A COMPARISON OF THE THREE-DIMENSIONAL STRUCTURES OF SUBTILISIN BPN AND SUBTILISIN NOVO

Relevant UniProtKB Entries

Percent Identity Matching Chains Protein Accession Entry Name
100.0 Subtilisin BPN' P00782 SUBT_BACAM