The importance of the conserved Arg191-Asp227 salt bridge of triosephosphate isomerase for folding, stability, and catalysis.


Abstract

Triosephosphate isomerase (TIM) has a conserved salt bridge 20 A away from both the active site and the dimer interface. In this study, four salt bridge mutants of Trypanosoma brucei brucei TIM were characterized. The folding and stability of the mutants are impaired compared to the wild-type enzyme. This salt bridge is part of a hydrogen bonding network which tethers the C-terminal beta7alpha7beta8alpha8 unit to the bulk of the protein. In the variants D227N, D227A, and R191S, this network is preserved, as can be deduced from the structure of the R191S variant. In the R191A variant, the side chain at position 191 cannot contribute to this network. Also the catalytic power of this variant is most affected. Study holds ProTherm entries: 14833, 14834, 14835, 14836, 14837 Extra Details: triosephosphate isomerase; folding; stability; salt bridge; kinetics

Submission Details

ID: W35ZNQcB4

Submitter: Connie Wang

Submission Date: April 24, 2018, 8:45 p.m.

Version: 1

Publication Details
Kursula I;Partanen S;Lambeir AM;Wierenga RK,FEBS Lett. (2002) The importance of the conserved Arg191-Asp227 salt bridge of triosephosphate isomerase for folding, stability, and catalysis. PMID:11997014
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
1AG1 1997-03-28T00:00:00+0000 2.36 MONOHYDROGEN PHOSPHATE BINDING TO TRYPANOSOMAL TRIOSEPHOSPHATE ISOMERASE
1DKW 1999-12-08T00:00:00+0000 2.65 CRYSTAL STRUCTURE OF TRIOSE-PHOSPHATE ISOMERASE WITH MODIFIED SUBSTRATE BINDING SITE
1IIG 2001-04-23T00:00:00+0000 2.6 STRUCTURE OF TRYPANOSOMA BRUCEI BRUCEI TRIOSEPHOSPHATE ISOMERASE COMPLEXED WITH 3-PHOSPHONOPROPIONATE
1IIH 2001-04-23T00:00:00+0000 2.2 STRUCTURE OF TRYPANOSOMA BRUCEI BRUCEI TRIOSEPHOSPHATE ISOMERASE COMPLEXED WITH 3-PHOSPHOGLYCERATE
1KV5 2002-01-25T00:00:00+0000 1.65 Structure of Trypanosoma brucei brucei TIM with the salt-bridge-forming residue Arg191 mutated to Ser
1ML1 1996-09-27T00:00:00+0000 2.6 PROTEIN ENGINEERING WITH MONOMERIC TRIOSEPHOSPHATE ISOMERASE: THE MODELLING AND STRUCTURE VERIFICATION OF A SEVEN RESIDUE LOOP
1MSS 1994-07-27T00:00:00+0000 2.4 LARGE SCALE STRUCTURAL REARRANGEMENTS OF THE FRONT LOOPS IN MONOMERISED TRIOSEPHOSPHATE ISOMERASE, AS DEDUCED FROM THE COMPARISON OF THE STRUCTURAL PROPERTIES OF MONOTIM AND ITS POINT MUTATION VARIANT MONOSS
1TPD 1994-02-28T00:00:00+0000 2.1 STRUCTURES OF THE "OPEN" AND "CLOSED" STATE OF TRYPANOSOMAL TRIOSEPHOSPHATE ISOMERASE, AS OBSERVED IN A NEW CRYSTAL FORM: IMPLICATIONS FOR THE REACTION MECHANISM
1TPE 1994-02-28T00:00:00+0000 2.1 COMPARISON OF THE STRUCTURES AND THE CRYSTAL CONTACTS OF TRYPANOSOMAL TRIOSEPHOSPHATE ISOMERASE IN FOUR DIFFERENT CRYSTAL FORMS
1TPF 1994-02-28T00:00:00+0000 1.8 COMPARISON OF THE STRUCTURES AND THE CRYSTAL CONTACTS OF TRYPANOSOMAL TRIOSEPHOSPHATE ISOMERASE IN FOUR DIFFERENT CRYSTAL FORMS

Relevant UniProtKB Entries

Percent Identity Matching Chains Protein Accession Entry Name
100.0 Triosephosphate isomerase, glycosomal P04789 TPIS_TRYBB