Homology modeling has been used to identify extra-chloroplastic enzymes tha
t contain potential disulfide bonds. All of the higher plant fructose bisph
osphatases and mitochondrial citrate synthases that have been tested to dat
e, two glyceraldehyde-3-P dehydrogenases, two enolases and one lactate dehy
drogenase, are redox-sensitive and may then be redox-regulated in vivo. App
arently, redox-sensitivity is not limited to the chloroplast.