This entry represents the N-terminal domain cytadhesin P1 from Mycoplasma. Cytadhesins are virulence factor proteins which mediate attachment of bacterial cells to host cells for invasion. P1 forms a transmembrane complex with P40/P90 called the 'Nap', which mediates motility and infectivity [1,2,3]. Structure of P1, revealed that it consists of a large N-terminal domain consisting of seven consecutive beta-sheets each with four antiparallel beta-strands, except for the seventh which has two strands, and adopts a beta-propeller topology [2,3]. Those two strands correspond to the cytoadherence epitope which has important immune properties [3]. The N-terminal domain is highly variable and described as a structured core surrounded by a fuzzy surface [3].

1: Molecular and biochemical analysis of a 105 kDa Mycoplasma gallisepticum cytadhesin (GapA). Goh MS, Gorton TS, Forsyth MH, Troy KE, Geary SJ; Microbiology. 1998;144:2971-2978. PMID:9846732

2: Structure and mechanism of the Nap adhesion complex from the human pathogen Mycoplasma genitalium. Aparicio D, Scheffer MP, Marcos-Silva M, Vizarraga D, Sprankel L, Ratera M, Weber MS, Seybert A, Torres-Puig S, Gonzalez-Gonzalez L, Reitz J, Querol E, Pinol J, Pich OQ, Fita I, Frangakis AS; Nat Commun. 2020;11:2877. PMID:32513917

3: Immunodominant proteins P1 and P40/P90 from human pathogen Mycoplasma pneumoniae. Vizarraga D, Kawamoto A, Matsumoto U, Illanes R, Perez-Luque R, Martin J, Mazzolini R, Bierge P, Pich OQ, Espasa M, Sanfeliu I, Esperalba J, Fernandez-Huerta M, Scheffer MP, Pinyol J, Frangakis AS, Lluch-Senar M, Mori S, Shibayama K, Kenri T, Kato T, Namba K, Fita I, Miyata M, Aparicio D; Nat Commun. 2020;11:5188. PMID:33057023