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Proteus mirabilis, an agent of urinary tract infection, expresses at least four fimbrial types. Among these are the MR/P (mannose-resistant/Proteus-like) fimbriae. MrpA, the structural subunit, is optimally expressed at 37 degrees C in Luria broth cultured statically for 48 h by each of seven strains examined. Genes encoding this fimbria were isolated, and the complete nucleotide sequence was determined. The mrp gene cluster encoded by 7,293 bp predicts eight polypeptides: MrpI (22,133 Da), MrpA (17,909 Da), MrpB (19,632 Da), MrpC (96,823 Da), MrpD (27,886 Da), MrpE (19,470 Da), MrpF (17,363 Da), and MrpG (13,169 Da). mrpI is upstream of the gene encoding the major structural subunit gene mrpA and is transcribed in the direction opposite to that of the rest of the operon. All predicted polypeptides share &gt; or = 25% amino acid identity with at least one other enteric fimbrial gene product encoded by the pap, fim, smf, fan, or mrk gene clusters.

Proteus mirabilis MR/P fimbrial operon: genetic organization, nucleotide sequence, and conditions for expression