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Product Description
BamH I (from Bacillus amyloliquefaciens ) is a type II restriction endonuclease, having the capacity for recognizing short sequences (6 b.p.) of DNA and specifically cleaving them at a target site. This exhibit focuses on the structure-function relations of BamH I as described by Newman, et al. (1995). BamH I binds at the recognition sequence 5'-GGATCC-3', and cleaves these sequences just after the 5'-guanine on each strand. This cleavage results in sticky ends which are 4 b.p. long. In its unbound form, BamH I displays a central b sheet, which resides in between a helices. BamH I is an extraordinarily unique molecule in that it undergoes a series of unconventional conformational changes upon DNA recognition. This allows the DNA to maintain its normal B-DNA conformation without distorting to facilitate enzyme binding. BamH I is a symmetric dimer. DNA is bound in a large cleft that is formed between dimers; the enzyme binds in a "crossover" manner. Each BamH I subunit makes the majority of its backbone contacts with the phosphates of a DNA half site but base pair contacts are made between each BamH I subunit and nitrogenous bases in the major groove of the opposite DNA half site .
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