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Determining the Basis of Channel-Tetramerization Specificity by X-Ray Crystallography and a Sequence-Comparison Algorithm: Family Values (FamVal)
Max H. Nanao, Wei Zhou, Paul J. Pfaffinger and Senyon Choe
Proceedings of the National Academy of Sciences of the United States of America
Vol. 100, No. 15 (Jul. 22, 2003), pp. 8670-8675
Published by: National Academy of Sciences
Stable URL: http://www.jstor.org/stable/3148279
Page Count: 6
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We have developed a semiempirical algorithm called Family Values (FamVal), which identifies residues that encode functional specificity in a protein sequence. Given a multiple sequence alignment (MSA) grouped into functionally distinct subfamilies, FamVal calculates a specificity score for each subfamily at every amino acid position of an MSA. This algorithm was used to predict specificity-encoding positions within the tetramerization assembly (T1) domain of voltage-gated potassium (Kv) channel subfamilies Kv3 and Kv4. The importance of one such position (Arg to Ala at MSA position 93) was confirmed by in vitro pull-down assays. The structural basis of this assembly discrimination was elucidated by determining the crystal structure of the Kv4 T1 domain and comparing it to the Kv3 T1 domain.
Proceedings of the National Academy of Sciences of the United States of America © 2003 National Academy of Sciences