Contacts of the helix formed by residues 52 - 81 (chain R) in PDB entry 5OXV
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 SER 52 (chain R).
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
-289J C 3.5 15.7 - - - -
77Q ARG* 4.6 6.5 - - - +
78Q ILE 3.2 13.8 + - - -
79Q ILE* 4.1 19.8 - - - -
80Q PRO* 4.2 1.1 - - - +
50R GLY 4.3 0.4 - - - -
51R ILE* 1.3 74.2 - - - +
53R SER* 1.3 54.9 + - - +
54R LYS* 3.3 7.1 + - - +
55R ALA* 2.9 22.2 + - - +
56R MET* 2.7 34.9 + - - +
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Residues in contact with SER 53 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
-290J A 5.5 0.2 - - - -
-289J C 2.7 33.9 + - - -
51R ILE 4.0 0.6 + - - -
52R SER* 1.3 68.9 - - - +
54R LYS* 1.3 60.4 + - - +
56R MET* 3.5 7.5 + - - +
57R SER* 3.0 26.5 + - - -
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Residues in contact with LYS 54 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
99L GLY* 5.2 1.7 - - - +
80Q PRO* 4.0 13.7 - - + -
103Q ALA* 6.5 1.8 - - + -
104Q GLN* 3.8 32.1 + - + +
52R SER* 3.2 6.7 + - - +
53R SER* 1.3 74.1 - - - +
55R ALA* 1.3 57.8 + - - +
57R SER* 2.9 10.9 + - - -
58R ILE* 2.8 39.8 + - + +
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Residues in contact with ALA 55 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
78Q ILE* 2.9 35.4 - - + +
79Q ILE* 4.0 6.1 - - - -
80Q PRO* 3.8 4.2 - - + +
83Q LEU* 4.0 5.1 - - + +
51R ILE* 3.3 12.6 - - + -
52R SER* 2.9 14.3 + - - +
54R LYS* 1.3 72.6 - - - +
56R MET* 1.3 70.0 + - - +
58R ILE* 3.2 14.0 + - - +
59R MET* 2.9 23.0 + - - +
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Residues in contact with MET 56 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
33R SER* 5.6 0.4 - - - +
34R TYR 3.7 2.5 - - - +
35R ALA* 3.5 45.5 - - + +
38R VAL* 3.5 40.4 - - + -
39R TYR* 5.1 5.2 - - + -
51R ILE* 3.7 24.3 - - + +
52R SER 2.7 20.6 + - - +
53R SER* 3.6 8.5 - - - +
55R ALA* 1.3 72.5 - - - +
57R SER* 1.3 56.2 + - - +
59R MET* 3.0 6.1 + - + +
60R ASN* 2.7 42.9 + - + +
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Residues in contact with SER 57 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
99L GLY 3.2 27.7 + - - -
100L PHE* 4.1 0.3 + - - -
101L GLY 4.5 6.2 + - - -
53R SER 3.0 11.4 + - - -
54R LYS* 2.9 16.9 + - - -
56R MET* 1.3 76.1 - - - +
58R ILE* 1.3 60.1 + - - -
60R ASN* 3.0 12.8 + - - +
61R SER* 2.9 23.0 + - - -
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Residues in contact with ILE 58 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
98L TYR* 3.9 22.7 - - + +
99L GLY* 3.9 20.9 - - - +
80Q PRO* 2.9 46.9 - - + -
83Q LEU* 3.5 15.9 - - + -
102Q ILE* 3.9 21.5 - - + -
103Q ALA* 4.0 5.6 - - + +
54R LYS* 2.8 23.5 + - + +
55R ALA* 3.5 5.6 - - - +
57R SER* 1.3 66.9 + - - +
59R MET* 1.3 60.9 + - - +
61R SER* 2.6 31.1 + - - -
62R PHE* 2.9 10.5 + - + +
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Residues in contact with MET 59 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
59Q THR* 4.1 31.2 - - - +
62Q ILE* 4.4 10.5 - - + -
63Q LEU* 4.3 9.0 - - + -
83Q LEU* 3.7 28.5 - - + -
38R VAL* 4.1 13.0 - - + -
51R ILE* 3.8 20.0 - - + -
55R ALA 2.9 16.8 + - - +
56R MET* 3.1 19.5 - - + +
58R ILE* 1.3 70.8 - - - +
60R ASN* 1.3 56.2 + - - +
62R PHE* 2.8 54.9 + - + +
63R VAL* 3.0 17.4 + - + +
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Residues in contact with ASN 60 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
101L GLY* 6.3 1.0 - - - -
102L GLY* 5.0 2.4 + - - +
32R GLU 5.1 2.4 + - - -
33R SER* 2.9 19.5 + - - +
34R TYR* 2.9 39.7 + - - +
38R VAL* 5.7 0.2 - - - -
56R MET* 2.7 23.6 + - + +
57R SER* 3.1 15.7 - - - +
59R MET* 1.3 72.0 - - - +
61R SER* 1.3 54.4 + - - +
63R VAL* 3.9 7.2 + - - +
64R ASN* 2.7 46.2 + - - +
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Residues in contact with SER 61 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
97L LEU 5.2 0.4 - - - -
98L TYR* 3.6 29.2 - - - -
99L GLY* 3.4 16.1 + - - -
101L GLY* 3.9 18.0 + - - -
102L GLY* 3.7 14.3 + - - +
57R SER* 2.9 13.0 + - - -
58R ILE 2.6 16.0 + - - -
60R ASN* 1.3 69.6 - - - +
62R PHE* 1.3 65.3 + - - -
64R ASN* 2.9 15.8 + - - +
65R ASP* 2.9 13.0 + - - +
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Residues in contact with PHE 62 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
98L TYR* 3.7 32.5 - + + -
55Q LEU* 5.4 1.6 - - + -
58Q LEU* 3.8 35.2 - - + -
59Q THR* 4.3 5.8 - - + -
62Q ILE* 3.4 30.7 - - + -
96Q LEU* 4.1 9.2 - - + -
97Q LEU* 3.8 23.8 - - + -
58R ILE* 2.9 8.7 + - + +
59R MET* 2.8 34.7 + - + +
61R SER* 1.3 71.7 - - - +
63R VAL* 1.3 70.3 + - + +
65R ASP* 3.3 0.9 + - - +
66R VAL* 3.1 43.0 + - + +
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Residues in contact with VAL 63 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
25Q PHE* 4.3 4.5 - - + -
55Q LEU* 3.5 29.5 - - + +
59Q THR* 4.3 23.3 - - + -
34R TYR* 3.6 48.9 - - + +
38R VAL* 4.6 11.4 - - + -
59R MET* 3.0 16.7 + - + +
60R ASN 4.1 2.5 - - - +
62R PHE* 1.3 83.7 - - + +
64R ASN* 1.3 52.2 + - - +
66R VAL* 3.4 0.4 + - - -
67R PHE* 2.7 33.3 + - - +
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Residues in contact with ASN 64 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
102L GLY* 3.4 31.0 + - - +
33Q LEU* 5.7 2.1 - - - +
34R TYR* 3.5 24.1 + - - -
60R ASN* 2.7 36.2 + - - +
61R SER 2.9 8.0 + - - +
63R VAL* 1.3 77.4 - - - +
65R ASP* 1.3 61.1 + - - +
67R PHE* 3.4 8.8 + - - +
68R GLU* 3.0 34.9 + - - +
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Residues in contact with ASP 65 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
91L LYS* 5.7 4.7 - - - +
96L THR* 5.1 7.2 - - + -
98L TYR* 2.3 46.0 + - + +
102L GLY 5.1 0.8 + - - -
97Q LEU* 4.6 0.3 - - - +
100Q VAL* 4.3 3.6 - - - +
61R SER 2.9 10.5 + - - +
62R PHE 3.7 4.3 - - - +
64R ASN* 1.3 70.7 - - - +
66R VAL* 1.3 59.1 + - - +
68R GLU* 3.0 13.3 + - - +
69R ARG* 2.8 66.8 + - - +
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Residues in contact with VAL 66 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
55Q LEU* 3.9 12.1 - - + -
58Q LEU* 3.8 19.3 - - + -
96Q LEU* 4.2 17.3 - - + -
62R PHE* 3.1 42.3 + - + +
63R VAL* 3.9 1.3 - - - +
65R ASP* 1.3 81.7 - - - +
67R PHE* 1.3 66.9 + - - +
69R ARG* 4.2 11.9 - - + +
70R ILE* 3.0 45.7 + - + +
98R LEU* 5.9 1.3 - - + -
99R LEU* 5.5 3.4 - - + -
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Residues in contact with PHE 67 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
30Q VAL* 3.8 20.9 - - + -
33Q LEU* 3.6 39.9 - - + -
34Q LEU* 4.0 19.3 - - + -
39Q TYR* 3.6 17.9 - + - -
51Q LEU* 4.0 10.8 - - + +
55Q LEU* 3.9 25.0 - - + +
34R TYR* 4.1 11.0 - - - +
63R VAL 2.7 23.4 + - - +
64R ASN* 3.4 11.4 - - - +
66R VAL* 1.3 74.1 - - - +
68R GLU* 1.4 65.8 + - + +
70R ILE* 3.8 1.4 - - - +
71R ALA* 2.8 45.4 + - + +
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Residues in contact with GLU 68 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
91L LYS* 4.4 22.3 + - - -
102L GLY 4.6 8.9 - - - +
39Q TYR* 4.3 16.0 + - + +
64R ASN* 3.0 31.1 + - - +
65R ASP* 3.0 8.0 + - - +
67R PHE* 1.4 79.2 - - + +
69R ARG* 1.3 62.1 + - + +
71R ALA* 4.4 3.1 - - - -
72R GLY* 2.7 33.5 + - - +
----------------------------------------------------------
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Residues in contact with ARG 69 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
96Q LEU* 2.7 43.2 + - - +
97Q LEU* 3.9 9.1 - - - +
100Q VAL* 4.4 8.3 - - - +
65R ASP* 2.8 54.7 + - - +
66R VAL* 3.8 8.8 - - - +
68R GLU* 1.3 80.1 - - + +
70R ILE* 1.3 61.1 + - - +
72R GLY* 4.1 0.3 - - - -
73R GLU* 3.1 17.7 + - - +
76R ARG* 4.8 2.2 + - - +
98R LEU* 3.2 43.3 + - + +
----------------------------------------------------------
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Residues in contact with ILE 70 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
51Q LEU* 4.2 25.6 - - + -
54Q VAL* 4.3 13.7 - - + -
55Q LEU* 5.4 0.9 - - + -
66R VAL* 3.0 39.3 + - + +
67R PHE 3.8 1.8 - - - +
69R ARG* 1.3 71.9 - - - +
71R ALA* 1.3 67.8 + - - +
73R GLU* 3.0 5.2 + - - +
74R ALA* 2.9 21.1 + - - +
91R ILE* 4.3 28.5 - - + +
94R ALA* 3.9 11.9 - - + +
95R VAL* 4.2 21.8 - - + -
98R LEU* 3.7 21.1 - - + -
99R LEU* 5.1 4.7 - - + -
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Residues in contact with ALA 71 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
34Q LEU* 4.3 13.5 - - + -
39Q TYR* 3.3 29.2 - - + +
51Q LEU* 4.9 2.7 - - + -
67R PHE* 2.8 40.7 + - + +
68R GLU 3.9 0.9 - - - +
70R ILE* 1.3 76.6 - - - +
72R GLY* 1.3 62.7 + - - +
74R ALA* 3.3 7.5 + - - +
75R SER* 3.0 22.5 + - - -
86R ILE* 4.2 2.3 - - - +
91R ILE* 5.3 0.7 - - - -
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Residues in contact with GLY 72 (chain R).
Click here for Legend to table.
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Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
39Q TYR* 3.9 12.2 - - - -
68R GLU 2.7 20.7 + - - -
69R ARG 4.1 0.2 - - - -
71R ALA* 1.3 72.3 - - - +
73R GLU* 1.3 55.6 + - - +
75R SER* 3.0 20.8 + - - -
76R ARG* 3.0 30.9 + - - -
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Residues in contact with GLU 73 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72P TYR* 2.6 30.1 + - - -
92P ARG* 3.2 25.6 + - - +
69R ARG 3.1 17.0 + - - +
70R ILE 3.0 4.0 + - - +
72R GLY* 1.3 74.2 - - - +
74R ALA* 1.3 60.7 + - - +
76R ARG* 3.1 38.4 + - - +
77R LEU* 3.2 17.5 + - - +
94R ALA* 4.2 10.8 - - + +
97R LEU* 3.7 22.8 - - + +
98R LEU* 3.9 13.7 - - + -
----------------------------------------------------------
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Residues in contact with ALA 74 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
70R ILE 2.9 11.7 + - - +
71R ALA* 3.4 12.3 - - - +
73R GLU* 1.3 77.6 - - - +
75R SER* 1.3 57.7 + - - +
77R LEU* 2.9 24.3 + - - +
78R ALA* 2.9 14.6 + - - +
86R ILE* 3.9 26.5 - - + -
90R GLU* 4.1 13.5 - - + +
91R ILE* 4.3 5.6 - - + +
94R ALA* 4.0 15.4 - - + +
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Residues in contact with SER 75 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
38M ASN* 5.1 0.2 - - - +
38Q ASN 4.6 0.9 + - - -
39Q TYR* 2.2 49.6 + - - -
71R ALA 3.0 13.0 + - - -
72R GLY* 3.0 13.9 + - - -
74R ALA* 1.3 75.6 - - - +
76R ARG* 1.3 59.9 + - - +
78R ALA* 3.5 2.5 + - - +
79R HIS* 2.9 38.0 + - - -
86R ILE* 3.8 8.2 - - - +
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Residues in contact with ARG 76 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72P TYR* 5.6 0.2 - - - -
91P LYS* 6.2 1.8 - - - -
92P ARG* 5.3 5.1 - - - +
69R ARG* 4.8 2.6 + - - +
72R GLY* 3.0 33.7 + - - -
73R GLU* 3.1 46.8 + - - +
74R ALA 3.3 0.2 - - - -
75R SER* 1.3 74.3 - - - +
77R LEU* 1.3 51.8 + - - +
79R HIS* 3.2 6.7 + - + +
80R TYR* 2.7 78.4 + - + +
----------------------------------------------------------
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Residues in contact with LEU 77 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72P TYR* 3.6 33.7 - - + +
75P HIS* 3.6 39.8 - - + +
73R GLU* 3.2 17.9 + - - +
74R ALA* 2.9 9.8 + - - +
76R ARG* 1.3 76.0 - - - +
78R ALA* 1.3 67.4 + - - +
80R TYR* 3.5 4.4 + - + -
81R ASN* 2.8 34.4 + - - +
90R GLU* 4.1 8.1 - - + +
93R THR* 3.7 25.6 - - + +
94R ALA* 3.8 17.7 - - - +
97R LEU* 4.2 9.0 - - + -
----------------------------------------------------------
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Residues in contact with ALA 78 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
40Q ALA* 4.8 5.6 - - + -
74R ALA 2.9 11.2 + - - +
75R SER* 3.6 8.5 - - - +
77R LEU* 1.3 79.3 - - - +
79R HIS* 1.3 64.0 + - + +
81R ASN 3.0 6.1 + - - -
83R ARG* 3.0 45.8 + - - +
85R THR 4.2 17.5 - - - +
86R ILE* 4.5 13.0 - - + -
90R GLU* 4.3 8.5 - - + +
----------------------------------------------------------
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Residues in contact with HIS 79 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
36M LYS 3.6 7.2 + - - -
37M GLY* 3.5 21.8 - - - -
38M ASN* 2.7 45.6 + - + -
39Q TYR 3.9 10.5 - - - -
40Q ALA* 5.7 0.7 - - + -
75R SER* 2.9 24.9 + - - -
76R ARG* 3.2 11.3 + - + +
78R ALA* 1.3 79.0 - - + +
80R TYR* 1.3 67.9 + - + +
81R ASN 3.0 1.4 + - - -
82R LYS* 3.0 16.5 + - - +
83R ARG 4.7 5.8 - - - +
----------------------------------------------------------
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Residues in contact with TYR 80 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72P TYR* 4.1 23.9 + + + -
88P TYR* 3.0 79.4 + + + +
91P LYS* 4.8 12.3 - - - +
76R ARG* 2.7 65.9 + - + +
77R LEU* 4.0 5.4 - - - +
78R ALA 3.3 0.4 - - - -
79R HIS* 1.3 76.9 - - + +
81R ASN* 1.3 64.5 + - - +
82R LYS* 3.4 8.3 + - - +
----------------------------------------------------------
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Residues in contact with ASN 81 (chain R).
Click here for Legend to table.
----------------------------------------------------------
Specific contacts
---------------------------
Residue Dist Surf HB Arom Phob DC
----------------------------------------------------------
72P TYR* 5.6 1.8 + - - -
75P HIS* 3.6 26.4 + - + +
76P ALA* 3.6 27.5 - - - +
78P ARG* 5.3 0.2 + - - -
77R LEU* 2.8 30.8 + - - +
78R ALA 3.0 2.4 + - - +
79R HIS 3.0 1.2 + - - -
80R TYR* 1.3 86.3 - - - +
82R LYS* 1.3 71.4 + - - +
83R ARG* 3.0 27.0 + - + +
----------------------------------------------------------
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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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