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Favin versus concanavalin A: Circularly permuted amino acid sequences
B A Cunningham1, J J Hemperly, T P Hopp
1The Rockefeller University, 1230 York Avenue, New York, New York 10021.
The beta chain of favin shares significant sequence homology with concanavalin A (Con A), suggesting similar structures and sugar-binding functions. This finding extends to other plant lectins, indicating conserved evolutionary pathways.
Area of Science:
- Molecular Biology
- Biochemistry
- Structural Biology
Background:
- Favin and concanavalin A (Con A) are plant lectins with known biological functions.
- Previous research established homology between the alpha chain of favin and a central region of Con A.
Purpose of the Study:
- To determine the amino acid sequence of the beta chain of favin.
- To compare the beta chain sequence with that of Con A to identify homologies.
- To infer structural and functional similarities between favin and Con A.
Main Methods:
- Amino acid sequencing of the favin beta chain.
- Sequence alignment and homology analysis comparing favin and Con A.
- Identification of conserved residues involved in metal binding and sugar interaction.
Main Results:
- The beta chain of favin exhibits homology with two distinct segments of Con A, spanning its N-terminus and C-terminus.
- The combined alpha and beta chains of favin are equivalent in size to Con A, revealing a circular permutation of homologous sequences.
- Favin shares conserved residues critical for sugar binding and metal ligation with Con A, suggesting structural and functional parallels.
Conclusions:
- The high degree of sequence homology strongly suggests that favin and Con A possess similar three-dimensional structures.
- Favin's primary structure and sugar specificity are closely related to pea and lentil lectins, implying shared structural features.
- Sequence similarities extend to other legume lectins, indicating a conserved evolutionary history and potential structural resemblance across diverse plant lectins.
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