Amino acids biochemical stmctures

Biochemically there are four major classifications of protein structure primary (amino acid sequence), secondary (local spatial arrangement), tertiary (overall 3D structure) and quaternary (protein complex stmcture). (Figure 1.8)... 

N. Yoshida, Y. Sakai, A. Isogai, H. Fukuya, M. Yagi, Y. Tani, and N. Kato, Primary stmctures of fungal fructosyl amino acid oxidases and their application to the measurement of glycated proteins, Eur. J. Biochem., 242 (1996)... 

Penicillin was the hrst P-lactam and the hrst broad-spectrum antibiotic discovered that started the Golden age (1940-1962) of antibiotics. The stmcture of penicillin contains a thiazolidine ring that is fused to a P-lactam ring. The existence and stability of the P-lactam ring was highly controversial at the time despite the availability of a single crystal X-ray structure of one of the penicillins. Penicillin G (8) was the first penicillin that was clinically used. Penicillin G was converted easily by either chemical or biochemical means to 6-amino-penicillanic acid (9),... 

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