umami -- the fifth basic taste

pleasant taste of food , its not bitter, not sour , not sweet , not even salty. A combination of two, three maybe all of them might might give rise to umami. Is there a scientific basis for the relative new sense of taste?

This sense of pleasant savory taste is due to a certain amino acid called glutamate. It has its own taste bud and receptor, that's why it is designated as the 5th primary taste.

How was it discovered?
http://www.umamiinfo.com/what_exactly_is_umami?/