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gudB

Gene
gudB
Protein
Cryptic catabolic NAD-specific glutamate dehydrogenase GudB
Organism
Bacillus subtilis (strain 168)
Length
427 amino acids
Function
GudB seems to be intrinsically inactive, however spontaneous mutations removing a 9-bp direct repeat within the wild-type gudB sequence activated the GudB protein and allowed more-efficient utilization of amino acids of the glutamate family. This insertion presumably causes severe destabilization of the fold of the protein, leading to an inactive enzyme that is very quickly degraded. The cryptic GudB serves as a buffer that may compensate for mutations in the rocG gene and that can also be decryptified for the utilization of glutamate as a single carbon source in the absence of arginine. It is unable to synthesize glutamate.
Similarity
Belongs to the Glu/Leu/Phe/Val dehydrogenases family.
Mass
47.34 kDa
Sequence
MAADRNTGHTEEDKLDVLKSTQTVIHKALEKLGYPEEVYELLKEPMRLLTVKIPVRMDDGSVKIFTGYRAQHNDSVGPTKGGIRFHPNVTEKEVKAVKALSIWMSLKCGIIDLPYGGGKGGIVCDPRDMSFRELERLSRGYVRAISQIVGPTKDVPAPDVFTNSQIMAWMMDEYSRIDEFNSPGFITGKPLVLGGSHGRESATAKGVTICIKEAAKKRGIDIKGARVVVQGFGNAGSYLAKFMHDAGAKVVGISDAYGGLYDPEGLDIDYLLDRRDSFGTVTKLFNDTITNQELLELDCDILVPAAIENQITEENAHNIRAKIVVEAANGPTTLEGTKILSDRDILLVPDVLASAGGVTVSYFEWVQNNQGFYWSEEEVEEKLEKMMVKSFNNIYEMANNRRIDMRLAAYMVGVRKMAEASRFRGWI