TRYPTOPHANINS - ISOLATION AND MOLECULAR CHARACTERIZATION OF OAT CDNA CLONES ENCODING PROTEINS STRUCTURALLY RELATED TO PUROINDOLINE AND WHEAT-GRAIN SOFTNESS PROTEINS
Ma. Tanchak et al., TRYPTOPHANINS - ISOLATION AND MOLECULAR CHARACTERIZATION OF OAT CDNA CLONES ENCODING PROTEINS STRUCTURALLY RELATED TO PUROINDOLINE AND WHEAT-GRAIN SOFTNESS PROTEINS, PLANT SCI, 137(2), 1998, pp. 173-184
The sequences of four oat cDNA clones, 3B3-5, 3B3-7, 3B3T-3 and 3B3T-5
, isolated from developing seeds, are all found to possess sequences e
ncoding a characteristic tryptophan-rich domain and, for this reason,
have been named tryptophanins. 3B3-3 and 3B3-7 are predicted to encode
two similar proteins, each consisting of 147 amino acids. 3B3T-3 and
3B3T-5 are predicted to encode identical proteins, 142 amino acids in
length. The oat tryptophanins share sequence identity with two wheat s
eed proteins, puroindoline and wheat grain softness protein. The trypt
ophan-rich domains show similarity with the antimicrobial peptide, bov
ine indolicidin. Copy number reconstruction experiments indicate that
the oar tryptophanins are encoded by a multi-gene family. RNA slot blo
t experiments verify the seed-specific expression of oat tryptophanins
while northern blot experiments indicate that cross-hybridizing RNAs
are also present in developing wheat, barley, and rye seeds bur nor in
developing rice seeds. (C) 1998 Elsevier Science Ireland Ltd. All rig
hts reserved.