biotech

hallo all, I have a problem with understanding the gatewaysystem. I have a vector that I want to turn into a destination (expression vector). Now I have made blunt ends and the reading frame of my vector ends with a triplet of bps. So I have: vector sequence .... TTA and here I want to introduce the gatewaysystem TGT rest of vector sequence. Now, if I follow the invitrogen information it states I should use the reading frame A (for N tag), but I do not understand how the reading frame stays ok if the resulting attb sites are 25 bps long! The genes I want to introduces into the gateway system (between the attb sites) are ORFs , so they start with an ATG codon right away. So this is how I see it after LR reaction: Expression vector sequence ...... TTA 1/2 EcorV (3bp) attB1 my ORF attB1 1/2 EcorV (3bps) rest of my expression vector sequence.... Now the attB1 site is 25 bps , so I dont see how the reading frame stays as it should stay! I mean: TTA ATC (=1/2 EcorV) 25 bps ATG .... attB1 1/2 EcorV .... those 25 bps => they will alter the reading frame and my ATG will not be in frame anymore! => it will be 21 bp attB1 site GGC TAT G.. ...... (T from tha attB1 site and the AT from the ATG start codon... So I am not sure this will work out... Or ?