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. 2013 Jul 1;20(1):44. doi: 10.1186/1423-0127-20-44

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Copyright © 2013 Chu et al.; licensee BioMed Central Ltd.

This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Determination of critical residues in P6 and P19 peptides. A) Alanine substitution scan of the peptides. Biotinylated peptides (30 μg/ml) were allowed to bind immobilized gp120_BaL (8 μg/ml). P6/34 means that Asp34 in P6 was substituted by alanine. It was same to other peptides, such as P6/35, P19/96, P19/101 and P19/96/101; P1 was used as a negative control; B) The structural view of P6 and P19 in SRCR1 model. The P6 was colored in cyan and P19 was colored in purple. Asp34, Asp35, Asn96 and Glu101 residues were labeled on the regions of P6 and P19.