Contacts of the helix formed by residues 56 - 85 (chain Q) in PDB entry 2NX5
Residue contacts within the protein are
derived with the CSU software (Sobolev V., Sorokine A.,
Prilusky J., Abola E.E. and Edelman M. (1999) Automated
analysis of interatomic contacts in proteins.
Bioinformatics, 15, 327-332). A
short description of the analytical approach
is given at the end of the page.
Note:
Non-standard 3 letter residue
codes indicate a heterogroup. To identify
and analyse, use LPC software
Legend:
Dist - nearest distance (Å) between atoms of two residues
Surf - contact surface area (Å2) between two residues
HB - hydrophilic-hydrophilic contact (hydrogen bond)
Arom - aromatic-aromatic contact
Phob - hydrophobic-hydrophobic contact
DC - hydrophobic-hydrophilic contact (destabilizing contact)
+/- - indicates presence/absence of a specific contacts
* - indicates residues forming contacts by their side chain
(including CA atoms)
Residues in contact with GLY 56 (chain Q).
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
54Q GLN 3.6 4.1 + - - -
55Q GLU* 1.3 74.2 + - - +
57Q PRO* 1.3 71.2 - - - +
58Q GLU* 3.1 5.2 - - - -
59Q TYR* 2.9 27.4 + - - +
60Q TRP* 3.1 9.8 - - - -
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Residues in contact with PRO 57 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
56Q GLY* 1.3 80.0 - - - +
58Q GLU* 1.3 57.8 + - + +
60Q TRP* 3.6 14.3 - - + -
61Q ASP* 2.8 47.9 + - - +
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Residues in contact with GLU 58 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
56Q GLY* 3.1 2.9 - - - -
57Q PRO* 1.3 79.1 - - + +
59Q TYR* 1.3 58.3 + - - +
61Q ASP* 4.4 3.7 - - - +
62Q ARG* 3.0 36.0 + - - +
96T GLY 3.4 20.4 - - - +
97T GLY* 3.0 29.5 - - - +
98T SER* 5.4 0.2 - - - -
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Residues in contact with TYR 59 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
7Q TYR* 4.7 0.7 + - - -
33Q PHE* 4.3 3.3 - - - -
34Q VAL* 4.7 3.9 - - + +
52Q ILE* 3.3 21.0 - - + +
55Q GLU* 3.3 46.4 - - + +
56Q GLY 2.9 15.1 + - - +
58Q GLU* 1.3 79.4 - - - +
60Q TRP* 1.3 74.3 + + - +
62Q ARG* 3.3 26.6 + - - +
63Q ASN* 2.6 64.7 + - - -
167Q TRP* 4.3 5.4 - + - -
171Q TYR* 2.3 36.0 + + - -
1S GLU* 3.5 20.1 + - - -
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Residues in contact with TRP 60 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
34Q VAL* 4.1 16.4 - - + -
45Q THR* 3.4 35.2 - - + +
47Q PRO* 3.5 41.7 - - + -
52Q ILE* 3.6 29.4 - - + -
53Q GLU* 4.5 4.9 - - - +
55Q GLU 2.7 18.7 + - - -
56Q GLY 3.1 23.6 + - - -
57Q PRO* 3.2 10.7 + - + +
59Q TYR* 1.3 95.9 - + - +
61Q ASP* 1.3 57.4 + - - +
63Q ASN* 3.8 2.1 + - - +
64Q THR* 2.8 38.0 + - - +
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Residues in contact with ASP 61 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
57Q PRO* 2.8 32.9 + - - +
58Q GLU* 4.4 3.9 - - - +
60Q TRP* 1.3 71.9 - - - +
62Q ARG* 1.3 60.9 + - - +
64Q THR* 3.5 6.0 + - - -
65Q GLN* 3.0 33.0 + - - +
56U ASP* 4.7 15.3 - - - +
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Residues in contact with ARG 62 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
58Q GLU* 3.0 50.2 + - - +
59Q TYR* 3.3 25.9 + - - +
60Q TRP 3.3 0.2 - - - -
61Q ASP* 1.3 76.4 - - - +
63Q ASN* 1.3 65.4 + - - +
65Q GLN* 3.1 12.7 + - - +
66Q ILE* 3.0 31.0 + - + +
167Q TRP* 3.8 16.8 - - - -
1S GLU* 3.2 35.6 + - - +
95T SER* 3.2 28.9 + - - +
96T GLY 4.1 1.2 + - - -
97T GLY 3.7 12.1 + - - +
98T SER* 4.3 15.0 - - - +
102T TYR* 3.7 24.4 + - + -
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Residues in contact with ASN 63 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
7Q TYR* 5.0 0.9 + - - -
34Q VAL* 6.0 0.9 - - - -
45Q THR* 3.2 27.6 - - + +
59Q TYR* 2.6 66.5 + - - +
60Q TRP* 4.1 4.6 - - - +
62Q ARG* 1.3 76.0 - - - +
64Q THR* 1.3 62.7 + - - +
66Q ILE* 3.3 7.8 + - - +
67Q PHE* 3.1 32.1 + - + -
1S GLU* 4.1 9.4 - - - +
2S PRO* 2.9 32.7 - - - +
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Residues in contact with THR 64 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
36Q PHE* 4.5 2.8 - - + -
43Q PRO 3.6 24.2 - - - +
44Q ARG* 3.6 11.8 - - + +
45Q THR* 3.0 26.6 + - - +
60Q TRP 2.8 23.7 + - - -
61Q ASP* 3.8 7.6 - - - -
63Q ASN* 1.3 74.5 - - - +
65Q GLN* 1.3 58.4 + - - +
67Q PHE* 3.8 0.9 - - - +
68Q LYS* 2.9 48.2 + - + +
50U TYR* 5.8 1.8 - - - +
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Residues in contact with GLN 65 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
61Q ASP 3.0 20.5 + - - +
62Q ARG* 3.1 8.9 + - - +
64Q THR* 1.3 74.9 - - - +
66Q ILE* 1.3 64.8 + - + +
68Q LYS* 3.9 1.4 - - - +
69Q THR* 2.9 33.3 + - - -
98T SER* 4.4 11.2 + - - -
103T ILE* 4.1 5.5 - - - +
31U TYR* 3.4 22.3 + - - +
48U TYR* 2.9 46.5 + - - -
50U TYR* 3.7 40.2 - - + +
56U ASP* 4.9 3.4 + - - +
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Residues in contact with ILE 66 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
62Q ARG* 3.0 26.0 + - + +
63Q ASN* 3.3 7.4 + - - +
65Q GLN* 1.3 81.8 - - + +
67Q PHE* 1.3 58.5 + - + +
69Q THR* 3.4 8.2 - - + -
70Q ASN* 2.9 32.2 + - - +
1S GLU* 5.0 3.6 - - - +
2S PRO* 4.2 19.7 - - + +
3S LEU 3.6 25.1 - - - +
4S PRO* 3.8 18.2 - - + -
5S GLN 4.5 3.4 - - - +
98T SER* 5.3 3.6 - - - +
102T TYR* 4.2 26.0 - - + -
31U TYR* 5.7 3.4 - - - +
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Residues in contact with PHE 67 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
7Q TYR* 4.0 19.3 - + - -
9Q TYR* 3.3 33.2 - + - -
22Q PHE* 4.2 5.8 - + - -
24Q ALA* 3.8 16.4 - - + -
34Q VAL* 5.5 2.7 - - + -
35Q ARG 6.2 0.7 - - - -
36Q PHE* 3.6 37.8 - + + -
45Q THR* 3.6 24.5 - - + -
63Q ASN* 3.1 24.7 + - + +
64Q THR 4.2 0.2 - - - +
66Q ILE* 1.3 74.6 - - + +
68Q LYS* 1.3 53.1 + - - +
69Q THR 3.3 0.2 - - - -
70Q ASN* 3.7 16.3 - - - +
71Q THR* 2.5 34.3 + - - -
2S PRO* 3.2 35.9 - - + -
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Residues in contact with LYS 68 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
36Q PHE* 4.1 14.1 - - + -
43Q PRO* 4.3 26.2 - - - +
64Q THR* 2.9 39.2 + - + +
65Q GLN 3.9 3.8 - - - +
67Q PHE* 1.3 73.4 - - - +
69Q THR* 1.3 66.1 + - - +
71Q THR* 3.3 24.6 + - - +
72Q GLN* 3.5 14.6 + - - +
50U TYR* 4.5 18.4 - - + +
54U ASP* 4.2 22.1 + - - +
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Residues in contact with THR 69 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
65Q GLN 2.9 17.3 + - - -
66Q ILE* 3.4 13.5 - - - +
68Q LYS* 1.3 74.2 - - - +
70Q ASN* 1.3 66.9 + - - +
72Q GLN* 3.1 11.6 + - - +
73Q THR* 3.0 21.1 + - - +
5S GLN 4.7 2.5 - - - +
6S GLY* 3.6 34.5 - - - +
30U ARG* 3.9 9.9 + - - +
31U TYR* 3.7 27.0 + - + +
50U TYR* 4.2 15.4 + - - +
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Residues in contact with ASN 70 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
9Q TYR* 3.0 38.4 + - - -
22Q PHE* 3.9 14.6 - - + -
66Q ILE* 2.9 19.9 + - - +
67Q PHE* 3.7 16.9 - - - +
69Q THR* 1.3 75.2 - - - +
71Q THR* 1.3 64.0 + - - +
73Q THR* 3.0 6.0 + - - -
74Q TYR* 2.9 32.2 + - + -
3S LEU 4.4 4.8 + - - -
5S GLN* 2.9 41.9 + - - +
6S GLY 4.5 0.9 + - - -
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Residues in contact with THR 71 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
20Q PRO 5.0 0.2 - - - +
22Q PHE* 4.1 18.5 - - + +
36Q PHE* 3.8 11.6 - - - -
38Q SER* 4.0 17.3 - - - -
67Q PHE 2.5 24.7 + - - -
68Q LYS* 3.3 17.7 + - - +
69Q THR 3.2 0.2 - - - -
70Q ASN* 1.3 77.7 - - - +
72Q GLN* 1.3 64.8 + - - +
74Q TYR* 3.5 1.7 + - - +
75Q ARG* 3.2 58.5 + - + +
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Residues in contact with GLN 72 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
68Q LYS* 3.6 17.3 - - - +
69Q THR* 3.1 5.7 + - - +
71Q THR* 1.3 78.1 - - - +
73Q THR* 1.3 63.5 + - - +
75Q ARG* 3.6 32.5 + - - +
76Q GLU* 3.3 22.9 + - - +
30U ARG* 3.3 26.4 + - - +
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Residues in contact with THR 73 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
69Q THR 3.0 10.6 + - - -
70Q ASN* 3.0 13.9 + - - -
72Q GLN* 1.3 78.4 - - - +
74Q TYR* 1.3 63.0 + - + +
76Q GLU* 3.5 5.2 + - - +
77Q SER* 3.0 30.6 + - - +
5S GLN* 4.2 6.3 - - - +
6S GLY* 3.7 11.7 + - - +
9S THR* 3.6 29.6 - - + -
10S ALA* 4.0 17.0 - - + +
11S TYR* 5.8 1.3 - - + -
30U ARG* 3.1 25.3 + - - +
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Residues in contact with TYR 74 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
9Q TYR* 3.2 32.2 - + + -
11Q ALA* 3.7 19.7 - - + -
22Q PHE* 3.4 25.1 - + + -
70Q ASN* 2.9 28.8 + - - +
71Q THR 4.2 1.3 - - - +
73Q THR* 1.3 80.3 - - + +
75Q ARG* 1.3 56.2 + - - +
76Q GLU 3.3 0.7 - - - -
77Q SER* 3.6 4.5 - - - -
78Q LEU* 2.7 41.0 + - - +
95Q ILE* 3.7 28.7 - - + +
97Q ARG* 3.2 32.1 + - + -
5S GLN* 3.4 19.5 - - - -
11S TYR* 3.6 26.9 + + - -
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Residues in contact with ARG 75 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
19Q GLU* 3.5 39.2 + - - +
20Q PRO* 2.8 46.8 + - + +
22Q PHE* 6.5 0.4 - - + -
38Q SER* 4.2 15.0 + - - -
39Q ASP* 5.4 1.4 + - - -
71Q THR* 3.2 38.4 + - - +
72Q GLN* 3.6 24.4 + - - +
73Q THR 3.4 0.2 - - - -
74Q TYR* 1.3 77.4 - - - +
76Q GLU* 1.3 59.6 + - - +
78Q LEU* 3.4 11.6 - - + +
79Q ARG* 3.3 26.5 + - - +
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Residues in contact with GLU 76 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72Q GLN 3.3 14.5 + - - +
73Q THR* 3.8 5.8 - - - +
74Q TYR 3.3 0.4 - - - -
75Q ARG* 1.3 75.4 - - - +
77Q SER* 1.3 60.9 + - - +
79Q ARG* 3.1 39.7 + - - +
80Q ASN* 2.9 46.8 + - - +
7S GLN* 5.9 2.9 - - - +
10S ALA* 4.8 11.0 - - + +
30U ARG* 5.3 6.0 + - - -
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Residues in contact with SER 77 (chain Q).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
73Q THR* 3.0 19.5 + - - +
74Q TYR* 3.6 12.7 - - - -
76Q GLU* 1.3 75.2 - - - +
78Q LEU* 1.3 57.1 + - - +
80Q ASN* 3.6 10.2 + - - +
81Q LEU* 2.8 41.2 + - - +
95Q ILE* 5.5 2.0 - - - -
10S ALA* 3.4 3.8 - - - +
11S TYR* 2.8 49.0 + - - +
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Residues in contact with LEU 78 (chain Q).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
11Q ALA* 3.8 22.4 - - + +
12Q MET 4.5 0.7 - - - +
13Q SER* 3.5 34.5 - - - +
20Q PRO* 3.2 32.5 - - + -
74Q TYR 2.7 32.5 + - - +
75Q ARG* 3.4 7.6 - - + +
76Q GLU 3.2 0.2 - - - -
77Q SER* 1.3 73.6 - - - +
79Q ARG* 1.3 56.8 + - - +
81Q LEU* 4.3 1.7 - - - +
82Q ARG* 3.4 34.9 + - - +
93Q HIS* 3.8 8.7 + - + +
95Q ILE* 3.3 33.3 - - + +
118Q TYR* 5.4 2.1 + - - -
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Residues in contact with ARG 79 (chain Q).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
20Q PRO* 6.2 0.9 - - + -
75Q ARG 3.3 13.1 + - - +
76Q GLU* 3.1 45.9 + - - +
78Q LEU* 1.3 74.7 - - - +
80Q ASN* 1.3 68.5 + - - +
81Q LEU 3.2 0.2 - - - -
82Q ARG* 3.0 22.9 + - - +
83Q GLY* 2.9 27.4 + - - -
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Residues in contact with ASN 80 (chain Q).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
76Q GLU* 2.9 38.4 + - - +
77Q SER* 3.6 3.5 - - - +
79Q ARG* 1.3 83.3 - - - +
81Q LEU* 1.3 56.2 + - - +
83Q GLY* 3.3 3.0 + - - -
84Q TYR* 2.9 45.2 + - + -
146Q LYS* 3.9 13.5 + - - +
10S ALA* 4.4 6.8 - - - +
11S TYR 3.1 28.2 - - - +
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Residues in contact with LEU 81 (chain Q).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
77Q SER* 2.8 24.5 + - - +
78Q LEU 4.3 3.4 - - - +
80Q ASN* 1.3 74.4 - - - +
82Q ARG* 1.3 63.6 + - - +
84Q TYR* 3.3 9.4 + - + +
85Q TYR* 3.2 38.4 + - + -
87Q GLN* 4.4 1.3 - - - -
95Q ILE* 3.5 31.0 - - + -
118Q TYR* 3.7 32.1 - - + -
123Q TYR* 3.3 44.9 - - + +
11S TYR* 4.2 20.4 - - + -
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Residues in contact with ARG 82 (chain Q).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
13Q SER* 3.1 27.1 + - - -
15Q PRO* 4.7 4.2 - - - +
20Q PRO* 5.1 6.7 - - - +
78Q LEU* 3.4 32.5 + - - +
79Q ARG* 3.0 22.7 + - - +
81Q LEU* 1.3 78.4 - - - +
83Q GLY* 1.3 58.0 + - - +
85Q TYR 3.7 0.3 + - - -
86Q ASN* 3.0 8.3 + - - -
87Q GLN* 2.9 51.8 + - + +
88Q SER 3.3 21.8 - - - +
89Q GLU* 4.1 26.4 - - - +
91Q GLY 4.2 7.5 + - - -
93Q HIS* 3.8 25.3 + - + +
118Q TYR* 4.4 0.8 + - - -
----------------------------------------------------------
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Residues in contact with GLY 83 (chain Q).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
79Q ARG 2.9 13.2 + - - -
80Q ASN* 3.7 4.5 - - - -
82Q ARG* 1.3 73.4 - - - +
84Q TYR* 1.3 67.2 + - - +
86Q ASN* 3.2 21.9 + - - +
----------------------------------------------------------
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Residues in contact with TYR 84 (chain Q).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
80Q ASN* 2.9 31.8 + - + -
81Q LEU* 3.3 17.0 + - + +
83Q GLY* 1.3 81.2 - - - +
85Q TYR* 1.3 61.0 + - + +
86Q ASN* 3.2 5.9 + - - -
123Q TYR* 3.4 16.6 - - - -
139Q ALA* 3.8 25.7 - - + +
142Q ILE* 3.6 32.2 - - + +
143Q THR* 3.5 9.8 + - - -
146Q LYS* 2.8 35.9 + - - +
11S TYR* 2.9 29.4 + - - -
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Residues in contact with TYR 85 (chain Q).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
81Q LEU* 3.2 25.9 + - + -
84Q TYR* 1.3 77.6 - - + +
86Q ASN* 1.3 68.8 + - - +
87Q GLN* 3.4 25.7 + - + +
118Q TYR* 3.6 32.7 - + - -
121Q LYS* 6.2 1.8 - - - -
123Q TYR* 3.1 21.6 - + - -
137Q ASP* 2.5 38.9 + - - -
139Q ALA* 3.6 23.3 - - + -
----------------------------------------------------------
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A short description of the
analytical approach
The contact analysis used in this page
is based upon the approach
developed in:
Sobolev V., Wade R.C., Vriend G.
and Edelman M. PROTEINS (1996)
25, 120-129.
Contact legitimacy depends on the hydrophobic-hydrophilic
properties of the contacting atoms. In order to
define it, for each inter-atomic contact,
eight atom classes have been introduced:
I Hydrophilic - N and O that can donate and accept hydrogen bonds
(e.g., oxygen of hydroxyl group of Ser. or Thr)
II Acceptor - N or O that can only accept a hydrogen bond
III Donor - N that can only donate a hydrogen bond
IV Hydrophobic - Cl, Br, I and all C atoms that are not in
aromatic rings and do not have a covalent bond to
a N or O atom
V Aromatic - C in aromatic rings irrespective of any other
bonds formed by the atom
VI Neutral - C atoms that have a covalent bond to at least one
atom of class I or two or more atoms from class II
or III; atoms; S, F, P, and metal atoms in all cases
VII Neutral-donor - C atoms that have a covalent bond with only one
atom of class III
VIII Neutral-acceptor - C atoms that have a covalent bond with only
one atom of class II
For each pair of contacts the state of legitimacy
is shown below:
Legend:
+, legitimate
-, illegitimate
------------------------------------------------------------
Atomic class I II III IV V VI VII VIII
------------------------------------------------------------
I (Hydrophilic) + + + - + + + +
II (Acceptor) + - + - + + + -
III (Donor) + + - - + + - +
IV (Hydrophobic) - - - + + + + +
V (Aromatic) + + + + + + + +
VI (Neutral) + + + + + + + +
VII (Neutral-donor) + + - + + + - +
VIII (Neutral-acceptor) + - + + + + + -
------------------------------------------------------------
Warning!
Atom classes for heterogroups are automatically
assigned based on the atomic coordinates. However, in
three cases (see below) the automatic assignment
is currently ambiguous. In these
cases, the user is advised to manually analyse
the full list of contacts using
LPC software.
1. Carbon atoms belonging to a 4-, 5- or 6-member ring are
considered "aromatic" (Class V) if the ring is approximately
planar, and "hydrophobic" (Class IV) or "neutral" (Classes
VI, VII, VIII) if the ring is non-planar.
2. The oxygen atom of a carbonyl or hydroxy group is considered
"hydroxy" (Class I) if the CO bond is longer than 1.29 Å, and
"carbonyl" (Class II) if shorter.
3. All nitrogen atoms are considered "hydrophilic" (Class I).
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