An octapeptide composed of these $L$-amino acids - Lys, Thr, Ser, Met, Arg, Trp, Tyr, Glu - was subjected to analyses with the following outcomes:
$\text{P}$. The N-terminal sequencing analysis by Sanger's method yielded 'Ser' at the $N$ -terminus.
$\text{Q}$. Chymotrypsin treatment gave a pentapeptide, a 'Tyr' containing dipeptide and a free 'Glu'.
$\text{R}$. Cyanogen bromide treatment gave two tetrapeptides.
$\text{S}$. Trypsin treatment gave two tripeptides and a dipeptide
Which one of the following is the correct octapeptide sequence?
- Ser-Tyr-Arg-Met-Lys-Thr-Trp-Glu
- Ser-Arg-Lys-Met-Tyr-Thr-Trp-Glu
- Ser-Met-Lys-Arg-Thr-Tyr-Trp-Glu
- Ser-Arg-Met-Lys-Trp-Thr-Tyr-Glu
