Question

Alpha helices are a type of secondary structure in proteins. What is the length of a 59.059.0 kDa single‑stranded α‑helical protein segment? Assume a mean residue mass of 110 Da110 Da .

Answer 1

in this question, we have to calculate the length of 59.0 kDa single stranded alpha helical protein segment.

For this,

step 1. We first convert the kDa into Da.

= 59.0 kDa* 1000Da/1 kDa = 59000 Da.

Since the main residue mass = 110 Da.

Therefore , number of residue = 59000 Da* 1 residue/110 Da = 536.36 residue.

step 2. In this step we shall calculate the length of 59000 Da single stranded alpha helical protein segment.

Length= 536.36 residue* 1.5 A/residue = 804.54 A.

thus the length of 59.0 kDa single-stranded alpha-helical protein segment is 804.54 A.

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