A Novel Sialic Acid Binding Site on Factor H Mediates Serum Resistance of Sialylated Neisseria gonorrhoeae

S Ram, AK Sharma, SD Simpson, S Gulati… - The Journal of …, 1998 - rupress.org
Factor H (fH), a key alternative complement pathway regulator, is a cofactor for factor I–mediated
cleavage of C3b. fH consists of 20 short consensus repeat (SCR) domains. Sialic acid …

The meningococcal vaccine candidate GNA1870 binds the complement regulatory protein factor H and enhances serum resistance

…, U Vogel, DM Granoff, S Ram - The Journal of …, 2006 - journals.aai.org
Neisseria meningitidis binds factor H (fH), a key regulator of the alternative complement
pathway. A∼ 29 kD fH-binding protein expressed in the meningococcal outer membrane was …

Meningococcal disease and the complement system

LA Lewis, S Ram - Virulence, 2014 - Taylor & Francis
Despite considerable advances in the understanding of the pathogenesis of meningococcal
disease, this infection remains a major cause of morbidity and mortality globally. The role of …

Infections of people with complement deficiencies and patients who have undergone splenectomy

S Ram, LA Lewis, PA Rice - Clinical microbiology reviews, 2010 - Am Soc Microbiol
The complement system comprises several fluid-phase and membrane-associated proteins.
Under physiological conditions, activation of the fluid-phase components of complement is …

The new multicomponent vaccine against meningococcal serogroup B, 4CMenB: immunological, functional and structural characterization of the antigens

D Serruto, MJ Bottomley, S Ram, MM Giuliani… - Vaccine, 2012 - Elsevier
Neisseria meningitidis is a major cause of endemic cases and epidemics of meningitis and
devastating septicemia. Although effective vaccines exist for several serogroups of …

The modern epidemic of syphilis

KG Ghanem, S Ram, PA Rice - New England Journal of Medicine, 2020 - Mass Medical Soc
Syphilis Over the past two decades, the incidence of syphilis has increased sharply. The
courses of both untreated and treated disease can be unpredictable. This review presents …

Binding of Complement Factor H to Loop 5 of Porin Protein 1A: A Molecular Mechanism of Serum Resistance of Nonsialylated Neisseria gonorrhoeae

S Ram, DP McQuillen, S Gulati, C Elkins… - The Journal of …, 1998 - rupress.org
Neisseria gonorrhoeae isolated from patients with disseminated infection are often of the
porin (Por1A) serotype and resist killing by nonimmune normal human serum. The molecular …

Binding of C4b-Binding Protein to Porin: A Molecular Mechanism of Serum Resistance of Neisseria gonorrhoeae

S Ram, M Cullinane, AM Blom, S Gulati… - The Journal of …, 2001 - rupress.org
We screened 29 strains of Neisseria gonorrhoeae and found 16/21 strains that resisted
killing by normal human serum and 0/8 serum sensitive strains that bound the complement …

Neisseria meningitidis GNA2132, a heparin-binding protein that induces protective immunity in humans

…, L Ciucchi, LA Lewis, S Ram… - Proceedings of the …, 2010 - National Acad Sciences
GNA2132 is a Neisseria meningitidis antigen of unknown function, discovered by reverse
vaccinology, which has been shown to induce bactericidal antibodies in animal models. Here …

The role of porins in neisserial pathogenesis and immunity

P Massari, S Ram, H Macleod, LM Wetzler - Trends in microbiology, 2003 - cell.com
Neisseria meningitidis and Neisseria gonorrhoeae are Gram-negative pathogenic bacteria
responsible for bacterial meningitis and septicemia, and the sexually transmitted disease …