PROTEIN-PROTEIN SALT BRIDGES IN 1HXW.
Listing by FirstGlance in Jmol.
LIGAND-PROTEIN AND NUCLEIC-PROTEIN SALT BRIDGES ARE NOT LISTED.
ONLY PROTEIN-PROTEIN SALT BRIDGES ARE LISTED.
Salt bridges involving ligands+ or nucleic acids can be visualized using Contacts & Non-Covalent Interactions.. or Ends.. (Tools tab).

Salt bridges are defined here as oppositely charged atoms ≤4.0 apart

(Jeffrey, George A., An introduction to hydrogen bonding. Oxford Univ. Press, 1997. Page 192.)

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Count = Number of nitrogen atoms engaged in salt bridges, including those with alternate locations.
   (The atom count in the lower left panel in FirstGlance excludes atoms with alternate locations.)
SeqNo = Sequence Number.
Ins = Insertion Code for sequence number (usually blank).
Chain: Oxygen anion chain is Bold* for between-chain bridges.
Atom:
   SIDECHAINS: OD = Oxygen Delta; NE, OE = Nitrogen or Oxygen Epsilon; NH = Nitrogen Eta; NZ = Nitrogen Zeta.
   CHAIN TERMINI: N, O, OXT are main chain atoms. (C for C-termini lacking 1 oxygen: more information.)
AltLoc = Alternate Location ID (usually blank).
DIST = Distance in between salt-bridged atoms.
   When the C-terminus lacks one oxygen: distance between the cationic nitrogen and the terminal carboxy carbon.

NITROGEN CATIONS DIST OXYGEN ANIONS NOTES
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Count Group1 SeqNo1 Ins1 Chain1 Atom1 AltLoc1 Group2 SeqNo2 Ins2 Chain2 Atom2 AltLoc2
1 PRO 1 A N 4.0 PHE 99 B* O End to end. Between chains.* 1 PRO 1 A N 2.5 PHE 99 B* OXT End to end. Between chains.* 2 ARG 8 A NE 3.2 ASP 29 B* OD1 Between chains.* 2 ARG 8 A NE 3.9 ASP 29 B* OD2 Between chains.* 3 ARG 8 A NH2 3.8 ASP 29 B* OD2 Between chains.* 4 LYS 14 A NZ 3.8 GLU 65 A OE2 5 LYS 20 A NZ 2.9 GLU 34 A OE2 6 LYS 43 A NZ 4.0 ASP 60 A OD2 7 ARG 57 A NH1 2.8 GLU 35 A OE1 7 ARG 57 A NH1 3.0 GLU 35 A OE2 8 ARG 57 A NH2 3.3 GLU 35 A OE1 9 ARG 87 A NH2 3.2 ASP 29 A OD1
10 PRO 1 B N 2.5 PHE 99 A* O End to end. Between chains.* 11 ARG 8 B NE 3.0 ASP 29 A* OD1 Between chains.* 11 ARG 8 B NE 3.6 ASP 29 A* OD2 Between chains.* 12 ARG 8 B NH2 3.7 ASP 29 A* OD1 Between chains.* 12 ARG 8 B NH2 2.8 ASP 29 A* OD2 Between chains.* 13 LYS 45 B NZ 3.8 ASP 30 B OD2 14 ARG 57 B NH1 2.9 GLU 35 B OE1 14 ARG 57 B NH1 3.1 GLU 35 B OE2 15 ARG 57 B NH2 3.7 GLU 35 B OE2 16 LYS 70 B NZ 2.8 GLU 65 B OE1 17 ARG 87 B NE 3.8 ASP 29 B OD1 18 ARG 87 B NH2 2.9 ASP 29 B OD1
Average distance between 24 salt-bridged atom pairs: 3.3 .
(Minimum 2.5, Maximum 4.0)

* 10 atom pairs in salt bridges between chains (inter-chain salt bridges).
24 total atom pairs in salt bridges.
5 atom pairs in salt bridges containing charged protein chain terminus atoms.
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