Required for the biosynthesis of putrescine. Catalyzes the first step of polyamine (PA) biosynthesis to produce putrescine from arginine (PubMed:14684170, PubMed:15733873, PubMed:16045477, PubMed:25409942). Is a major contributor to basal arginine decarboxylase (ADC) activity and putrescine biosynthesis (PubMed:25409942). Accumulation of putrescine plays a positive role in salt stress tolerance (PubMed:14684170). Accumulation of putrescine plays a positive role in freezing tolerance (PubMed:18701673). Production of PA is essential for normal seed development (PubMed:15733873). Controls PA homeostasis which is crucial for normal plant growth and development (PubMed:27014322).

Belongs to the Orn/Lys/Arg decarboxylase class-II family. SpeA subfamily.

711 amino acids

MPALACVDTSFVPPAYAFSDTAGDVFIPASSPTSAAVVVDRWSPSLSSSLYRIDGWGAPYFIANSSGNISVRPHGSETLPHQDIDLLKIVKKVTGPKSSGGLGLQLPLIVRFPDVLKNRLECLQSAFDYAIKSQGYDSHYQGVYPVKCNQDRFVVEDIVKFGSSFRFGLEAGSKPEILLAMSCLCKGSPDAFLVCNGFKDAEYISLALLGRKLALNTVIVLEQEEELDLVIELSQKMNVRPVIGLRAKLRTKHSGHFGSTSGEKGKFGLTTTQIVRVVRKLRQSGMLDCLQLLHFHIGSQIPSTSLLSDGVAEAAQLYCELVRLGAHMKVIDIGGGLGIDYDGSKSGESDLSVAYSLEEYAEAVVASVRVVCDRSSVKHPVICSESGRAIVSHHSVLIFEAVSADKPMVHQATPGDIQFLLEGNEEARANYEDLYAAVMRGDHESCLLYVDQLKQRCVEGFKEGVLSIEQLASVDGLCEWVLKAIGASDPVHTYNINLSVFTSIPDLWGIDQLFPIVPIHKLDQRPGARGILSDLTCDSDGKINKFIGGESSLPLHELDKNGSGGRYFLGMFLGGAYEEALGGVHNLFGGPSVVRVSQSDGPHSFAVTRAVPGQSSADVLRAMQHEPELMFQTLKHRAEEMMHTKGGSEGENEEEEEDDEFNNVAASLDRSFHNMPYLATEQASPSNSLSAAISNLGFYYCDEDVYDYISA

77.2 kDa

(Note: Representative image - actual molecular weight may vary depending on tag type and expression method)

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