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older name of gingipain

Gingipains were previously known as argingipain and lysine-gingipain, but the older collective term was trypsin-like cysteine proteinases (or trypsin-like proteases) of Porphyromonas gingivalis.
More specifically, the older names were:
  • Arg-gingipain (Rgp) - formerly called "gingipain-R" or "Arg-specific cysteine proteinase"
  • Lys-gingipain (Kgp) - formerly called "gingipain-K" or "Lys-specific cysteine proteinase"
The broadest older name used in the literature was "gingivain" - this was the original name given before the standardized "gingipain" nomenclature was adopted in the mid-1990s.
So the direct answer: the older name of gingipain is gingivain.

why gingivain

The name "gingivain" came from the organism it was isolated from:
  • Porphyromonas gingivalis - the bacterium that produces this enzyme
  • The enzyme was named by taking "gingiv-" from gingivalis + the suffix "-ain", which is a standard suffix used for cysteine proteases (e.g., papain, bromelain, ficain)
So the naming logic was:
gingivalis + -ain (cysteine protease suffix) = gingivain
Later, when researchers characterized the enzyme more thoroughly and found there were multiple distinct forms with different substrate specificities (arginine-specific and lysine-specific), the name was updated to "gingipain" to better reflect its role as a virulence factor of P. gingivalis, and the two subtypes (Rgp and Kgp) were defined.
The suffix "-pain" in gingipain also loosely follows the cysteine protease naming convention (like papain, calpain), while dropping the strict "-ain" form.

test to detect gingipain

Gingipain detection relies on its proteolytic activity or immunological identification. Here are the main tests:

1. BANA Test (most classic)

  • Full name: Benzoyl-DL-Arginine-Naphthylamide test
  • Detects trypsin-like activity of gingipain (Arg-gingipain specifically)
  • The enzyme hydrolyzes the BANA substrate, releasing naphthylamine, which turns the strip red/pink
  • Done on subgingival plaque samples
  • Detects P. gingivalis, Treponema denticola, and Tannerella forsythia collectively
  • Simple chairside test

2. Fluorescence-Based Enzyme Assays

  • Uses fluorogenic substrates like Z-Arg-Arg-AMC (for Rgp) or Z-Lys-AMC (for Kgp)
  • Gingipain cleaves the substrate, releasing AMC (7-amino-4-methylcoumarin), which fluoresces
  • Measured by fluorometer
  • More specific and quantitative - used in research settings

3. ELISA

  • Uses antibodies specific to gingipain protein
  • Can detect and quantify gingipain in saliva, GCF (gingival crevicular fluid), or plaque
  • Highly specific

4. Western Blot / Immunoblotting

  • Detects gingipain by molecular weight using specific antibodies
  • Used in research to confirm identity and size of the protein

5. PCR (indirect)

  • Detects the rgpA, rgpB (Arg-gingipain genes) or kgp (Lys-gingipain gene) in P. gingivalis
  • Not detecting the enzyme directly, but the genetic source

6. Lateral Flow Immunoassay (newer)

  • Rapid point-of-care test using gingipain-specific antibodies
  • Similar format to a pregnancy test strip
  • Being developed for salivary diagnostics

Clinical Relevance

The BANA test is the most recognized in clinical dentistry for chairside use, while fluorogenic substrate assays are the gold standard in research for quantifying specific gingipain activity.
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