Molecular characterization of the Arginine decarboxylase gene family in rice.
Arginine decarboxylase (ADC) is a key enzyme in plants that converts arginine into putrescine, an important mediator of abiotic stress tolerance. Adc genes have been isolated from a number of dicotyledonous plants but the oat and rice Adc genes are the only representatives of monocotyledonous species described thus far. Rice has a small family of Adc genes, and OsAdc1 expression has been shown to fluctuate under drought and chilling stress. We identified and characterized a second rice Adc gene (OsAdc2) which encodes a 629-amino-acid protein with a predicted molecular mass of 67 kDa. An unusual feature of the OsAdc2 gene is the presence of an intron and a short upstream open reading frame in the 5'-UTR. Sequence comparisons showed that OsAdc2 is more closely related to the oat Adc gene than to OsAdc1 or to its dicot homologs, and mRNA analysis showed that the two rice genes are also differently regulated. Whereas OsAdc1 is expressed in leaf, root and stem, OsAdc2 expression is restricted to stem tissue. Protein expression was investigated with specific antibodies against ADC1 and ADC2, corroborating the mRNA data. We discuss the expression profiles of OsAdc1 and OsAdc2 and potential functions for the two corresponding proteins.
Peremarti
Ariadna
A
Departament de Producció Vegetal i Ciència Forestal, ETSEA, Universitat de Lleida, Av. Alcalde Rovira Roure 191, 25198, Lleida, Spain.
Bassie
Ludovic
L
Zhu
Changfu
C
Christou
Paul
P
Capell
Teresa
T
D020121:5' Untranslated Regions / Q000235:genetics; D000595:Amino Acid Sequence; D001483:Base Sequence; D015317:Biogenic Polyamines / Q000378:metabolism; D002262:Carboxy-Lyases / Q000096:biosynthesis / Q000235:genetics* / Q000276:immunology; D002736:Chloroplasts / Q000378:metabolism; D017124:Conserved Sequence; D018506:Gene Expression Regulation, Plant; D017343:Genes, Plant; D007438:Introns; D008969:Molecular Sequence Data; D005810:Multigene Family; D016366:Open Reading Frames; D009928:Organ Specificity; D012275:Oryza / Q000201:enzymology / Q000235:genetics*; D010940:Plant Proteins / Q000096:biosynthesis / Q000235:genetics* / Q000276:immunology; D018514:Plant Structures / Q000201:enzymology; D010944:Plants / Q000235:genetics; D021382:Protein Sorting Signals / Q000235:genetics; D011544:Pseudogenes / Q000235:genetics; D012333:RNA, Messenger / Q000096:biosynthesis; D018749:RNA, Plant / Q000096:biosynthesis; D016415:Sequence Alignment; D017385:Sequence Homology
D020121:5' Untranslated Regions; D015317:Biogenic Polyamines; D010940:Plant Proteins; D021382:Protein Sorting Signals; D012333:RNA, Messenger; D018749:RNA, Plant; D002262:Carboxy-Lyases; C019722:arginine decarboxylase