Escherichia coli GlpE is a prototype sulfurtransferase for the single-domain rhodanese homology superfamily.
Structure
; 9(11): 1117-25, 2001 Nov.
Article
en En
| MEDLINE
| ID: mdl-11709175
ABSTRACT
BACKGROUND:
Rhodanese domains are structural modules occurring in the three major evolutionary phyla. They are found as single-domain proteins, as tandemly repeated modules in which the C-terminal domain only bears the properly structured active site, or as members of multidomain proteins. Although in vitro assays show sulfurtransferase or phosphatase activity associated with rhodanese or rhodanese-like domains, specific biological roles for most members of this homology superfamily have not been established.RESULTS:
Eight ORFs coding for proteins consisting of (or containing) a rhodanese domain bearing the potentially catalytic Cys have been identified in the Escherichia coli K-12 genome. One of these codes for the 12-kDa protein GlpE, a member of the sn-glycerol 3-phosphate (glp) regulon. The crystal structure of GlpE, reported here at 1.06 A resolution, displays alpha/beta topology based on five beta strands and five alpha helices. The GlpE catalytic Cys residue is persulfurated and enclosed in a structurally conserved 5-residue loop in a region of positive electrostatic field.CONCLUSIONS:
Relative to the two-domain rhodanese enzymes of known three-dimensional structure, GlpE displays substantial shortening of loops connecting alpha helices and beta sheets, resulting in radical conformational changes surrounding the active site. As a consequence, GlpE is structurally more similar to Cdc25 phosphatases than to bovine or Azotobacter vinelandii rhodaneses. Sequence searches through completed genomes indicate that GlpE can be considered to be the prototype structure for the ubiquitous single-domain rhodanese module.
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Bases de datos:
MEDLINE
Asunto principal:
Tiosulfato Azufretransferasa
/
Proteínas de Escherichia coli
/
Proteínas de Unión al ADN
Idioma:
En
Revista:
Structure
Asunto de la revista:
BIOLOGIA MOLECULAR
/
BIOQUIMICA
/
BIOTECNOLOGIA
Año:
2001
Tipo del documento:
Article
País de afiliación:
Italia