Molecular analyses of a barley multigene family homologous to the yeast protein kinase gene SNF1.
Genomic sequences homologous to the yeast gene SNF1 have been isolated from barley (Hordeum vulgare) cv. Sunbar. SNF1 encodes a protein serine/threonine kinase required for the derepression of a number of genes, including SUC2 (invertase) in response to glucose deprivation. Southern blotting showed the presence of a family of related genes in barley and full-length sequences have been determined for two members of the family, one of which lacks an exon and is almost certainly non-functional. A partial sequence has been obtained for a third member of the family. The transcription start site of one of the genes has been determined by S1 nuclease protection. A transcript almost identical in sequence to the exons of one of the genes has been amplified from barley endosperm mRNA using the polymerase chain reaction. One of the full-length genomic sequences contains nine introns and 10 exons and the number and position of the introns in the second full-length sequence is identical except that it lacks exon 2. However, the length and sequence of the introns vary. Northern blot analyses indicated that related transcripts are present in aleurones, coleoptiles, endosperms, internodes, leaves, ovules, roots and root tips, with highest levels of expression in the aleurones and endosperms.
Halford
N G
NG
Department of Agricultural Sciences, University of Bristol, AFRC Institute of Arable Crops Research, Long Ashton, UK.
Vicente-Carbajosa
J
J
Sabelli
P A
PA
Shewry
P R
PR
Hannappel
U
U
Kreis
M
M
D000595:Amino Acid Sequence; D001483:Base Sequence; D002874:Chromosome Mapping; D003001:Cloning, Molecular; D001467:Hordeum / Q000235:genetics*; D007438:Introns / Q000235:genetics; D008969:Molecular Sequence Data; D005810:Multigene Family / Q000235:genetics*; D010940:Plant Proteins / Q000235:genetics*; D016133:Polymerase Chain Reaction; D017346:Protein Serine-Threonine Kinases / Q000235:genetics*; D012333:RNA, Messenger / Q000235:genetics; D017422:Sequence Analysis, DNA; D017386:Sequence Homology, Amino Acid
D010940:Plant Proteins; D012333:RNA, Messenger; C081179:BKIN12 protein, Hordeum vulgare; C103365:BKIN2 protein, Hordeum vulgare; C071570:SNF1-related protein kinases; D017346:Protein Serine-Threonine Kinases