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. 1988 Aug;170(8):3350–3358. doi: 10.1128/jb.170.8.3350-3358.1988

Purification of the Escherichia coli type 1 pilin and minor pilus proteins and partial characterization of the adhesin protein.

M S Hanson 1, J Hempel 1, C C Brinton Jr 1
PMCID: PMC211301  PMID: 2900235

Abstract

Type 1 pili of Escherichia coli contain three integral minor proteins with apparent molecular weights (Mr) of 28,000 (28K protein), 16,500, and 14,500 attached to rods composed of Mr-17,000 pilin subunits (Hanson and Brinton, Nature [London] 322:265-268). We describe here an improvement on our earlier method of pilus purification, which gives higher yields and higher purity. Also reported are methods allowing fractionation of intact type 1 pili into rods of pure pilin and free minor proteins, as well as fractionation of the 28K tip adhesion protein from the 16.5K and 14.5K proteins. We have determined the amino acid composition and amino-terminal sequence of the adhesion protein. This sequence shows limited homology with the amino-terminal sequences of several E. coli pilins, including type 1.

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