High impact information on TRP1

• Suppressors of the blue fluorescence phenotype of the Arabidopsis trp1-100 mutant can be used to identify mutations in genes involved in plant tryptophan biosynthesis [1].
• Genetic redundancy may be common to many aromatic amino acid biosynthetic enzymes in plants because mutants defective in two other genes (TRP1 and TRP3) also exhibit a conditional tryptophan auxotrophy [2].
• AtTRP1 is a single copy gene located on chromosome 5 of A. thaliana [3].
• It also implies that this protein AtTRP1 may bind in vivo primarily to the ends of plant chromosomes, which consist of long stretches of telomeric repeats [3].
• The ability of the first introns from both the TRP1 and POLYUBIQUITIN10 (UBQ10) genes to elevate mRNA accumulation in transgenic plants was found to decline with distance from the promoter, despite their being efficiently spliced from all coding sequence locations [4].

Biological context of TRP1

• To explore the potential mechanisms of intron-mediated enhancement in Arabidopsis thaliana, the effect of varying the position of an intron was determined using a series of reporter gene fusions between TRYPTOPHAN BIOSYNTHESIS1 (TRP1) and GUS [4].
• The AtTRP1 domain responsible for AtKu70 interaction occurs between amino acid sequence positions 80 and 269 [5].
• Our results show that one myb-like protein, AtTRP1, interacts specifically with AtKu70, the latter protein having a previously described role in plant telomere metabolism [5].

Associations of TRP1 with chemical compounds

• The trp1 alleles cause plants to accumulate varying amounts of blue fluorescent anthranilate compounds, and only the two least severely affected of the prototrophs have any detectable PAT enzyme activity [6].
• Whereas much has been learned in recent years about the genetic control of tryptophan biosynthesis in Arabidopsis and other plants, relatively little is known about the genetic regulation of phenylalanine and tyrosine synthesis [7].

Other interactions of TRP1

• The Smh-type genes are plant specific and include a gene family in Arabidopsis and the PcMYB1 gene of parsley (Petroselinum crispum) but are distinct from those (AtTRP1, AtTBP1, and OsRTBP1) recently shown to encode in vitro telomere-repeat DNA-binding activity [8].

References