Propensity of amino acids in loop regions connecting beta-strands.
The fact that loops assume important roles in molecular functions and biological recognition is well known. In this study the Propensity and the Relative entropy of amino-acids in loop structures connecting beta-strands are calculated. Results showed that Asn is the most frequently occurring amino-acid in loop regions connecting beta-strands, followed by Gly, Asp, Ser, and Thr. Results presented here can serve for modeling loop structures connecting beta-strands in proteins.
Using passive haemagglutination test, 48 human strains of Staphylococcus aureus cultivated on trypticase soya have been shown to be non-producers, but after subcultures especially on gelified "Oxoid broth n 2", 46 strains (95%) produced protein A. This observation points out the troubles encountered during protein A detection on the field of routine work.