PMID- 10493859
OWN - NLM
STAT- MEDLINE
DCOM- 19991020
LR  - 20131121
IS  - 0022-2836 (Print)
IS  - 0022-2836 (Linking)
VI  - 292
IP  - 1
DP  - 1999 Sep 10
TI  - Switch of coenzyme specificity of p-hydroxybenzoate hydroxylase.
PG  - 87-96
AB  - p-Hydroxybenzoate hydroxylase (PHBH) is the archetype of the family of
      NAD(P)H-dependent flavoprotein aromatic hydroxylases. These enzymes share a
      conserved FAD-binding domain but lack a recognizable fold for binding the
      pyridine nucleotide. We have switched the coenzyme specificity of strictly
      NADPH-dependent PHBH from Pseudomonas fluorescens by site-directed mutagenesis.
      To that end, we altered the solvent exposed helix H2 region (residues 33-40) of
      the FAD-binding domain. Non-conservative selective replacements of Arg33 and
      Tyr38 weakened the binding of NADPH without disturbing the protein architecture. 
      Introduction of a basic residue at position 34 increased the NADPH binding
      strength. Double (M2) and quadruple (M4) substitutions in the N-terminal part of 
      helix H2 did not change the coenzyme specificity. By extending the replacements
      towards residues 38 and 40, M5 and M6 mutants were generated which were
      catalytically more efficient with NADH than with NADPH. It is concluded that
      specificity in P. fluorescens PHBH is conferred by interactions of Arg33, Tyr38
      and Arg42 with the 2'-phosphate moiety of bound NADPH, and that introduction of
      an acidic group at position 38 potentially enables the recognition of the
      2'-hydroxy group of NADH. This is the first report on the coenzyme reversion of a
      flavoprotein aromatic hydroxylase.
CI  - Copyright 1999 Academic Press.
FAU - Eppink, M H
AU  - Eppink MH
AD  - Department of Biomolecular Sciences, Laboratory of Biochemistry, Wageningen
      University, Wageningen, 6703 HA, The Netherlands.
FAU - Overkamp, K M
AU  - Overkamp KM
FAU - Schreuder, H A
AU  - Schreuder HA
FAU - Van Berkel, W J
AU  - Van Berkel WJ
LA  - eng
SI  - PDB/1CJ2
SI  - PDB/1CJ3
SI  - PDB/1CJ4
PT  - Journal Article
PL  - England
TA  - J Mol Biol
JT  - Journal of molecular biology
JID - 2985088R
RN  - 0 (Bacterial Proteins)
RN  - 0 (Coenzymes)
RN  - 0 (Flavoproteins)
RN  - 0U46U6E8UK (NAD)
RN  - 53-59-8 (NADP)
RN  - EC 1.14.13.2 (4-Hydroxybenzoate-3-Monooxygenase)
SB  - IM
MH  - 4-Hydroxybenzoate-3-Monooxygenase/*chemistry/genetics
MH  - Amino Acid Sequence
MH  - Bacterial Proteins/chemistry/genetics
MH  - Coenzymes/*chemistry/genetics
MH  - Flavoproteins/chemistry/genetics
MH  - Kinetics
MH  - Models, Molecular
MH  - Molecular Sequence Data
MH  - Mutagenesis, Site-Directed
MH  - NAD/chemistry
MH  - NADP/chemistry
MH  - Protein Binding
MH  - Protein Structure, Secondary
MH  - Pseudomonas fluorescens/*enzymology
MH  - Spectrophotometry
MH  - Substrate Specificity
MH  - X-Ray Diffraction
EDAT- 1999/09/24 00:00
MHDA- 1999/09/24 00:01
CRDT- 1999/09/24 00:00
PHST- 1999/09/24 00:00 [pubmed]
PHST- 1999/09/24 00:01 [medline]
PHST- 1999/09/24 00:00 [entrez]
AID - 10.1006/jmbi.1999.3015 [doi]
AID - S0022-2836(99)93015-2 [pii]
PST - ppublish
SO  - J Mol Biol. 1999 Sep 10;292(1):87-96. doi: 10.1006/jmbi.1999.3015.