Required for the inhibition of nifA activity in response to oxygen and low level of fixed nitrogen. nifL Nitrogen fixation regulatory protein 519 NIFL_AZOVI MTPANPTLSNEPQAPHAESDELLPEIFRQTVEHAPIAISITDLKANILYANRAFRTITGYGSEEVLGKNESILSNGTTPRLVYQALWGRLAQKKPWSGVLVNRRKDKTLYLAELTVAPVLNEAGETIYYLGMHRDTSELHELEQRVNNQRLMIEAVVNAAPAAMVVLDRQHRVMLSNPSFCRLARDLVEDGSSESLVALLRENLAAPFETLENQGSAFSGKEISFDLGGRSPRWLSCHGRAIHIENEQAHVFFAPTEERYLLLTINDISELRQKQQDSRLNALKALMAEEELLEGMRETFNAAIHRLQGPVNLISAAMRMLERRLGDKAGNDPVLSAMREASTAGMEALENLSGSIPVRMAESKMPVNLNQLIREVITLCTDQLLAQGIVVDWQPALRLPWVMGGESSQRSMIKHLVDNAIESMSQNQVSRRELFISTRVENHLVRMEITDSGPGIPPDLVLKVFEPFFSTKPPHRVGRGMGLPVVQEIVAKHAGMVHVDTDYREGCRIVVELPFSAST