Loading AI tools
From Wikipedia, the free encyclopedia
Maltoporins (or LamB porins) are bacterial outer membrane proteins of the porin family. Maltoporin forms a trimeric structure which facilitates the diffusion of maltodextrins across the outer membrane of Gram-negative bacteria. The membrane channel is formed by an antiparallel beta-barrel.[2]
LamB porin | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|
Identifiers | |||||||||||
Symbol | LamB | ||||||||||
Pfam | PF02264 | ||||||||||
InterPro | IPR003192 | ||||||||||
SCOP2 | 2mpr / SCOPe / SUPFAM | ||||||||||
TCDB | 1.B.3 | ||||||||||
OPM superfamily | 32 | ||||||||||
OPM protein | 2mpr | ||||||||||
CDD | cd01346 | ||||||||||
|
Most pores used for diffusion contain only 16 antiparallel strands, but maltoporin has 18. The structure of maltoporin contains long loops and short turns. The long loops are in contact with the cell exterior and the turns are in contact with the periplasm. This channel is involved in sugar transport. The sugar initially binds to the first greasy residue with van der Waals forces. The sugar continues through the channel by guided diffusion of the sugar along the greasy residues which form a "slide".[3]
Maltoporin's original name was LamB because it is a bacteriophage lambda receptor. This channel is specific for maltosaccharides, whose affinity for the channel increases as the length of the chain increases.[3]
Seamless Wikipedia browsing. On steroids.
Every time you click a link to Wikipedia, Wiktionary or Wikiquote in your browser's search results, it will show the modern Wikiwand interface.
Wikiwand extension is a five stars, simple, with minimum permission required to keep your browsing private, safe and transparent.