For the agroinfiltration assays, genes were cloned into the BIN61S binary vector between the 35S promoter and terminator sequences. Binary vectors contain all
cis sequences required for
Agrobacterium-mediated plant transformation or transient expression (37 (
link)). P14 was previously described (38 (
link)). Brief descriptions of cloning of unpublished constructs are given here, whereas primer sequences are available as Supplementary Figure 1.
To create binary PHA clone, PHA fragment was PCR amplified with PHA1-F/PHA2-R primers from common bean, cloned first to pBluescript KS, and then it was moved into BIN61S. PCR-based
in vitro mutagenesis (PHA1mut-F/PHA2mut-R primers) of PHA was carried out with QuikChange Mutagenesis Kit (Stratagene) to create PHA-m. PHA-s, which contains the ORF of PHA-m from ATG to PTC, was PCR amplified from PHA-m (PHA1-F/PHA2mut-R primers), and then cloned into BIN61S. UPF1 was RT–PCR amplified (Stratagene, ProSTAR
®ULTRA HF RT–PCR System) from
Arabidopsis thaliana leaf RNA with UPF1-F/UPF1-R primers, cloned into pBluescript KS (KSUPF1), and then UPF1 was moved into BIN61S. UPF1DN was obtained by introducing point mutations into KSUPF1 with R863C-F/R863C-R primers, and then the mutant fragment was cloned into BIN61S. To create GFP binary construct, GFP fragment lacking the endoplasmic retention signal was PCR amplified from 35SGFP construct (39 (
link)) with mGFP4-F/mGFP4-R primers and cloned to BIN61S.
abc, bc, c, b and
a fragments were PCR amplified from PHA-m with PHAB1-F/PHAX1-R, PHAB2-F/PHAX1-R, PHAB3-F/PHAX1-R, PHAB2-F/PHAX2-R, PHAB1-F/PHAX3-R primers, respectively. These PCR products were cloned just downstream of the stop codon of binary GFP vector. P-G700, P-G500 and P-G300 PCR fragments were generated with GUS-F/GUS700-R, GUS-F/GUS500-R, GUS-F/GUS300-R primers, and then these fragments were cloned into PHA-s. ST-LS1 (referred to as Ls in this manuscript) intron was PCR amplified with Ls-F and Ls-R primers from GUS-intron construct (40 (
link)), it was cloned into pBluescript KS (KSLs), and then it was moved downstream of GFP-
c. To create P-99Ls, Ls fragment was cloned from KSLs into PHA-s-78 binary vector, which contained PHA-s ORF + 78 nt downstream of PTC. To obtain P-28Ls, PHA-s was cloned to KSLs and then PHA-sLs fragment was moved into BIN61S. To obtain P-28 and P-99 constructs, RT–PCR products were generated with pFF-R and pKS KpnI primers from RNA samples isolated from P-28Ls and P-99Ls infiltrated leaves, and then these fragments were cloned into BIN61S. λN fragment was PCR amplified with LN-F and LN-R primers from λN construct (41 (
link)) and cloned into BIN61S. To obtain λN-UPF1, UPF1 from KSUPF1 was cloned into λN binary clone. BoxB tethering target sequence, which contains five direct repeats of boxB, was PCR amplified from 5boxB plasmid (41 (
link)) with 5BB-F/5BB-R primers, and then it was cloned into the 3′-UTR region of GFP-
c and PHA-s-78 binary constructs (GFP3′boxB and P-3′boxB). To create GFP5′boxB and P-5′boxB 5′-UTR tethering target plasmids, boxB was cloned into the 5′-UTR region of GFP and PHA-s binary vectors.
Kertész S., Kerényi Z., Mérai Z., Bartos I., Pálfy T., Barta E, & Silhavy D. (2006). Both introns and long 3′-UTRs operate as cis-acting elements to trigger nonsense-mediated decay in plants. Nucleic Acids Research, 34(21), 6147-6157.