Purification and characterization of thin pili of IncI1 plasmids ColIb-P9 and R64: formation of PilV-specific cell aggregates by type IV pili.

Abstract:

:Thin pili of the closely related IncI1 plasmids ColIb-P9 and R64 are required only for liquid mating and belong to the type IV family of pili. They were sedimented by ultracentrifugation from culture medium in which Escherichia coli cells harboring ColIb-P9- or R64-derived plasmids had been grown, and then the pili were purified by CsCl density gradient centrifugation. In negatively stained thin pilus samples, long rods with a diameter of 6 nm, characteristic of type IV pili, were observed under an electron microscope. Gel electrophoretic analysis of purified ColIb-P9 thin pili indicated that thin pili consist of two kinds of proteins, pilin and the PilV protein. Pilin was demonstrated to be the product of the pilS gene. Pilin was first synthesized as a 22-kDa prepilin from the pilS gene and subsequently processed to a 19-kDa protein by the function of the pilU product. The N-terminal amino group of the processed protein was shown to be modified. The C-terminal segments of the pilV products vary among six or seven different types, as a result of shufflon DNA rearrangements of the pilV gene. These PilV proteins were revealed to comprise a minor component of thin pili. Formation of PilV-specific cell aggregates by ColIb-P9 and R64 thin pili was demonstrated and may play an important role in liquid mating.

journal_name

J Bacteriol

journal_title

Journal of bacteriology

authors

Yoshida T,Furuya N,Ishikura M,Isobe T,Haino-Fukushima K,Ogawa T,Komano T

doi

10.1128/JB.180.11.2842-2848.1998

subject

Has Abstract

pub_date

1998-06-01 00:00:00

pages

2842-8

issue

11

eissn

0021-9193

issn

1098-5530

journal_volume

180

pub_type

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