Question

Question 2 Tuftsin (named after Tufts University has important functions in the human immune system. It binds to stereospecific receptors at the surface of macrophages and leukocytes, stimulating their bactericidal and tumoricidal activity. All stereocenters in this molecule have configurations. How many stereoisomers of tuftsin exist, which do not have the correct stereochemistry for receptor-binding? -che-an 0 0 HN0--0-che- Онон

Answer 1

There are total of 5 stereocenters in the given molecule (n=5).
Total stereoisomers = 2^n = 2^5 = 32
Out of these 32 stereoisomers, only one stereoisomer, which has all "S" configuration will give correct stereochemistry. Rest 31 stereoisomers will not give correct stereochemistry for receptor binding.
Hence answer is option 4) 31.