PMID- 11997014
OWN - NLM
STAT- MEDLINE
DCOM- 20020529
LR  - 20131121
IS  - 0014-5793 (Print)
IS  - 0014-5793 (Linking)
VI  - 518
IP  - 1-3
DP  - 2002 May 8
TI  - The importance of the conserved Arg191-Asp227 salt bridge of triosephosphate
      isomerase for folding, stability, and catalysis.
PG  - 39-42
AB  - 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.
FAU - Kursula, Inari
AU  - Kursula I
AD  - Department of Biochemistry and Biocenter Oulu, University of Oulu, P.O. Box 3000,
      FIN-90014 Oulu, Finland.
FAU - Partanen, Sanna
AU  - Partanen S
FAU - Lambeir, Anne Marie
AU  - Lambeir AM
FAU - Wierenga, Rik K
AU  - Wierenga RK
LA  - eng
SI  - PDB/1KV5
PT  - Journal Article
PL  - England
TA  - FEBS Lett
JT  - FEBS letters
JID - 0155157
RN  - 0 (Salts)
RN  - 30KYC7MIAI (Aspartic Acid)
RN  - 94ZLA3W45F (Arginine)
RN  - EC 5.3.1.1 (Triose-Phosphate Isomerase)
SB  - IM
MH  - Animals
MH  - Arginine/genetics/*physiology
MH  - Aspartic Acid/genetics/*physiology
MH  - Binding Sites
MH  - Catalysis
MH  - Conserved Sequence
MH  - Enzyme Stability
MH  - Hydrogen Bonding
MH  - Kinetics
MH  - Models, Chemical
MH  - Models, Molecular
MH  - Mutation
MH  - Protein Folding
MH  - Salts/chemistry
MH  - Triose-Phosphate Isomerase/*chemistry/genetics/*metabolism
MH  - Trypanosoma brucei brucei/*enzymology
EDAT- 2002/05/09 10:00
MHDA- 2002/05/30 10:01
CRDT- 2002/05/09 10:00
PHST- 2002/05/09 10:00 [pubmed]
PHST- 2002/05/30 10:01 [medline]
PHST- 2002/05/09 10:00 [entrez]
AID - S001457930202639X [pii]
PST - ppublish
SO  - FEBS Lett. 2002 May 8;518(1-3):39-42.