BtuB: Difference between revisions
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<StructureSection load='3m8d' size='450' side='right' scene='43/439262/Cv/1' caption='E. coli BtuB complex with cobalamin (a vitamin B12 derivative), lipid, methanesulfonothioate derivative and Ca+2 ions (green) (PDB code [[3m8d]])'> | |||
== Function == | |||
'''BtuB''' or '''vitamin B12 receptor''' or '''outer membrane cobalamin transporter''' is an outer membrane receptor found in a variety of bacteria, such as ''E. coli''. BtuB transports vitamin B12 across the membrane of gram-negative bacteria. The transport is achieved with high affinity by the collaboration of BtuB and the periplasmic protein TonB. <ref>PMID:14499604</ref> As an essential receptor for the cell that is constitutively expressed, it is an ideal target to be parasitized, a feature exploited by a variety of proteins such as [[Colicin]]s. | |||
== Structural highlights == | |||
BtuB depends on the presence of Ca+2 ions for high affinity <scene name='43/439262/Cv/6'>binding of cobalamin (a form of vitamin B12)</scene>. The <scene name='43/439262/Cv/7'>Ca+2 ions are coordinated to several Asp side chains</scene>.<ref>PMID:20816073</ref> | |||
==3D structure of BtuB== | ==3D structure of BtuB== | ||
[[BtuB 3D structures]] | |||
</StructureSection> | |||
== References == | |||
<references/> | |||
[[Category:Topic Page]] | [[Category:Topic Page]] | ||
Latest revision as of 08:05, 24 December 2024
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