The reaction requires pyridoxal 5 ' - phosphate as a co-factor .
The reaction forms part of the subpathway that synthesizes L - glutamate 5 - semialdehyde from L - ornithine .
The reaction requires pyridoxal 5 ' - phosphate as a co-factor and forms part of the subpathway that synthesizes L - glutamate 5 - semialdehyde from L - ornithine .